Month: June 2024

Dioctyltin dilaurate (DOTDL) – Amine Catalysts (newtopchem.com)

Low-odor reactive catalysts: improving the environment and industrial efficiency

Catalysts are a vital material in industrial production and chemical reactions. They accelerate reaction rates, improve product purity and can often be reused many times, resulting in cost savings. However, with increased awareness of environmental protection and employee health and safety, the odor that can be generated by conventional catalysts has become a significant issue. To address this issue, low-odor reactive catalysts have been developed.

Low-odor reactive catalysts have the following distinctive features:

1. Odor Control: These catalysts produce significantly less odor during the chemical reaction process. This feature is especially important for industries that require clean working environments and reduced odor contamination, such as food processing and pharmaceutical manufacturing.

2. High Efficiency: Low odor reactive catalysts not only reduce odor generation, but also maintain the high catalytic efficiency of traditional catalysts. They are able to achieve higher conversion rates at lower temperatures and pressures, thus increasing productivity.

3. Environmentally friendly: By reducing odor emissions, low-odor reactive catalysts help to reduce the level of environmental pollution caused by industrial production and reduce the impact on surrounding air quality, in line with the concept of sustainable development.

4. Widely applicable: These catalysts can be used in chemical reactions in a wide range of industrial sectors, including organic synthesis, petroleum processing, gas treatment, and more. Their design flexibility allows them to meet the requirements of different reactions.

5. Technological innovation: The development of low-odor reactive catalysts requires a combination of advanced materials science, catalytic chemistry and engineering technology, which promotes technological innovation and progress in related fields.

Overall, the emergence of low-odor reactive catalysts not only improves the working environment and productivity, but also pushes industrial production in a more environmentally friendly and sustainable direction. As environmental and health and safety concerns continue to grow, this type of catalyst will find wider application and development in the future.

Translated with DeepL.com (free version)

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An investigation of the chemical properties of bis(dodecylthio)dibutyltin

Title: An investigation of the chemical properties of bis(dodecylthio)dibutyltin

In the field of modern organic synthetic chemistry and materials science, organotin compounds have attracted much attention because of their unique physicochemical properties, among which bis(dodecylthio)dibutyltin, as a typical organotin compound, is of great significance in the study of its chemical properties for the understanding of its applications in the fields of catalysts, stabilisers and bactericides. In this paper, we will discuss the chemical properties of bis(dodecylthio)dibutyltin from the aspects of structural features, stability, reactivity and environmental protection properties.

Structural characteristics
Bis(dodecylthio)dibutyltin, the chemical formula of which can be expressed as [(C12H25S)2Sn(C4H9)2], is an organostannic compound containing two long-chain dodecylsulfanyl groups and two butyl groups. This structure endows the compound with both hydrophobicity (due to the presence of the long-chain alkyl groups) and good solubility in organic phases, which is essential for its application in organic media. At the same time, the chemical bond formed between the tin and sulphur atoms has a certain polarity, which influences its reactivity and interaction with other molecules.

Stability
Bis(dodecylthio)dibutyltin exhibits relatively good thermal and chemical stability. At room temperature, the compound is not easily oxidised or hydrolysed and is able to maintain its structure over a wide temperature range. However, at high temperatures or under strong acid and alkali conditions, especially in the presence of oxidising agents, its stability decreases significantly, which may lead to structural damage or the release of tin ions. This property requires special consideration when selecting them as additives or catalysts.

Reactivity
The reactivity of this compound is mainly reflected in the coordination reactions and catalytic processes in which it is involved. Due to the nucleophilic nature of the sulphur group, bis(dodecylthio)dibutyltin is able to form stable complexes with a wide range of transition metals, which is particularly important in catalysing polymerisation and addition reactions. In addition, it can act as a stabiliser to prevent chain transfer reactions in polymer synthesis, thereby improving the molecular weight and thermal stability of the product. It is worth noting that its reactivity is also affected by factors such as solvent environment, temperature and pressure, and its performance in a particular reaction can be optimised by modulating these conditions.

Environmentally Friendly Properties
The environmental behaviour of organotin compounds has become one of the main focuses of research as global awareness of environmental protection increases. Although bis(dodecylthio)dibutyltin (DBT) has been widely used in several industrial fields due to its high efficiency, its potential ecotoxicity cannot be ignored. Studies have shown that organotin compounds are difficult to degrade in the environment and may cause cumulative toxicity to aquatic organisms. Therefore, the development of low-toxicity and easily biodegradable alternatives, as well as the strict control of their post-use treatment and discharge, are important directions for current research.

Conclusion
As an important class of organotin compounds, bis(dodecylthio)dibutyltin (BSDBT) exhibits a wide range of potential applications in the fields of chemical synthesis and materials science due to its unique chemical properties. Understanding and mastering its structural characteristics, stability, reactivity and its environmental impact are of great significance for the rational use of this compound and the sustainable development of related industries. Future research should further explore the possibilities of its new applications, and at the same time strengthen the assessment of its safety and environmental protection to ensure the harmonious coexistence of scientific and technological progress and environmental protection.

extended reading：

Dioctyltin dilaurate (DOTDL) – Amine Catalysts (newtopchem.com)

Phenylarsinic acid

Structural formula

Business number	02D6
Molecular formula	C6H7AsO3
Molecular weight	202.04
label	Ai3-16050[qr], Arsonicacid,phenyl-, Arsonicacid,phenyl-[qr], Kyselinabenzenarsonova, Monophenylarsonic acid, Phenylarsenic acid, Phenyl-arsonicaci, Phenylarsonic acid[qr]

Numbering system

CAS number:98-05-5

MDL number:MFCD00002097

EINECS number:202-631-9

RTECS number:CY3150000

BRN number:None

PubChem ID:None

Physical property data

1. Characteristics: White crystalline powder.

2. Density (g/mL,25℃): 1.76

3. Relative vapor density (g/mL,air =1): Undetermined

4. Melting point (ºC): 160

5. Boiling point (ºC,normal pressure): Undetermined

6. Boiling point (ºC, kPa): Not determined

7. Refractive index: Undetermined

8. Flashpoint (ºC): Undetermined

9. Specific optical rotation (º): Undetermined

10. Autoignition point or ignition temperature (ºC）: Undetermined

11. Vapor pressure (mmHg, 55ºC): Undetermined

12. Saturated vapor pressure (kPa, 25 ºC): Not determined

13. Heat of combustion (KJ/mol): Undetermined

14. Critical temperature (ºC): Undetermined

15. Critical pressure (KPa): Undetermined

16. Oil and water (octanol/Log value of the partition coefficient (water): undetermined

17. Explosion limit (%,V/V): Undetermined

18. Lower explosion limit (%,V/V): Undetermined

19. Solubility: Undetermined

Toxicological data

Acute toxicity: Rat oral LD50: 50mg/kg;
MouseOral LD50：270μg/kg;
-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA”>Rabbit intravenous injectionLD50:16mg/kg;

Ecological data

It is extremely harmful to water and toxic to fish. Do not let the product enter the water body.

Molecular structure data

None

Compute chemical data

1. Reference value for hydrophobic parameter calculation (XlogP):

2. Number of hydrogen bond donors: 2

3. Number of hydrogen bond acceptors: 3

4. Number of rotatable chemical bonds: 1

5. Number of tautomers:

6. Topological molecular polar surface area (TPSA): 57.5

7. Number of heavy atoms: 10

8. Surface charge: 0

9. Complexity: 145

10. Number of isotope atoms: 0

11. Determine the number of atomic stereocenters: 0

12. The number of uncertain atomic stereocenters: 0

13. Determine the number of stereocenters of chemical bonds: 0

14. Uncertain number of chemical bond stereocenters: 0

15. Number of covalent bond units: 1

Properties and stability

Does not decompose under normal temperature and pressure. Avoid contact with oxidants.

Storage method

Stored in a cool, ventilated warehouse. Keep away from fire and heat sources. should be kept away from oxidizer, do not store together. Use explosion-proof lighting and ventilation facilities. It is prohibited to use mechanical equipment and equipment that are prone to sparks
Tools. The storage area should be equipped with emergency release equipment and suitable containment materials.

Synthesis method

After diazotization of aniline and Arsenous acid reaction is obtained.

Purpose

is used as an analytical reagent.

neopentyl alcohol

Structural formula

Business number	01K8
Molecular formula	C5H12O
Molecular weight	88.15
label	2,2-Methyl-1-propanol, tert-butylmethanol, tert-Butyl carbinol, 2,2-Dimethylpropanol, Neopentanol, Neopentyl alcohol, alcohol solvents, aliphatic compounds

Numbering system

CAS number:75-84-3

MDL number:MFCD00004682

EINECS number:200-907-3

RTECS number:None

BRN number:1730984

PubChem number:24865983

Physical property data

1. Properties: colorless crystals with mint smell.

2. Density (g/mL, 20℃): 0.811

3. Solubility parameter (J·cm^-3)^0.5: 19.265

4. Melting point (ºC): 52.5

5. Boiling point (ºC, normal pressure): 113~114

6. van der Waals area (cm²·mol^-1): 9.170×10⁹

7. Refractive index ( 50ºC): 1.3915

8. Flash point (ºC, closed): 36

9. van der Waals volume (cm³·mol^-1): 62.610

10. Gas phase standard entropy (J·mol^-1·K^-1): 366.85 p>

11. Liquid phase standard combustion heat (enthalpy) (kJ·mol^-1): -3283.2

12. Liquid phase standard claimed heat (enthalpy) ( kJ·mol^-1): -399.4

13. Liquid phase standard entropy (J·mol^-1·K^-1): 229.3

14. Liquid phase standard free energy of formation (kJ·mol^-1): -175.23

15. Critical pressure ( KPa): Undetermined

16. Log value of oil-water (octanol/water) partition coefficient: Undetermined

17. Explosion upper limit (%, V/V): Undetermined

18. Lower explosion limit (%, V/V): Undetermined

19. Solubility (%, water, 20ºC): 0.039

20. Dissolution Properties: Slightly soluble in water, miscible with many organic solvents such as alcohols, ethers, ketones, esters and aromatic hydrocarbons, and also miscible with mineral oil and vegetable oil.

Toxicological data

None

Ecological data

None

Molecular structure data

1. Molar refractive index: 26.71

2. Molar volume (cm³/mol): 108.6

3. Isotonic specific volume (90.2K ):242.9

4. Surface tension (dyne/cm): 25.0

5. Polarizability (10^-24cm³) :10.59

Compute chemical data

1. Reference value for hydrophobic parameter calculation (XlogP): None

2. Number of hydrogen bond donors: 1

3. Number of hydrogen bond acceptors: 1

4. Number of rotatable chemical bonds: 1

5. Number of tautomers: none

6. Topological molecule polar surface area 20.2

7. Number of heavy atoms: 6

8. Surface charge: 0

9. Complexity: 33.7

10. Number of isotope atoms: 0

11. Determine the number of atomic stereocenters: 0

12. Uncertain number of atomic stereocenters: 0

13. Determine the number of chemical bond stereocenters: 0

14. Number of uncertain chemical bond stereocenters: 0

15. Number of covalent bond units: 1

Properties and stability

1. It has the chemical reactivity of primary alcohols. Highly flammable. When using, avoid inhaling the dust of this product and avoid contact with eyes and skin.

2. Exist in smoke.

Storage method

This product should be sealed and stored in a cool place.

Synthesis method

1. Preparation method:

In a reaction bottle equipped with a stirrer, thermometer, and dropping funnel, add 800g of 30% hydrogen peroxide, cool it in an ice bath, and add dropwise a dilute solution composed of 800g of concentrated sulfuric acid and 310g of crushed ice while stirring and cool it to below 10°C. For sulfuric acid, control it at 5-10°C and finish adding it in about 20 minutes. Then, 224.4g (2.0mol) of 2,4,4-trimethyl-1-pentene (2) was added dropwise, and the addition was completed in 5 to 10 seconds. Remove the ice bath and stir the reaction at 25°C for 24 hours. Separate the organic layer and cool it in an ice bath, add 500g of 70% sulfuric acid dropwise with vigorous stirring, and keep the internal temperature at 15 to 25°C, which will take about 67 to 75 minutes. After the addition is completed, stir at 5 to 10°C for 30 minutes. Leave to stand for 1 to 3 hours, separate the organic layer, pour into 1000 mL of water, and distill under normal pressure (foam may appear, and distillation can be stopped at this time). After cooling the distilled liquid, separate the organic layer, dry it over anhydrous sodium sulfate^①, fractionate, collect the fractions between 111 and 113°C to obtain 2,2-dimethyl-1-propanol^②(1) 60～70, yield 34%～40%. Note: ① Dry thoroughly before distillation, otherwise the product will form an azeotrope (80~85℃) with water, which will affect the yield. ② This reaction is similar to the hydrogen peroxide oxidation of ethyl-propyl benzene to produce phenol and acetone. Under acidic conditions, the peroxide is rearranged to produce alcohol and acetone. ^[1]

Purpose

Solvent, raw material for organic synthesis.

Progress on organotin products bis(dodecylthio)

As an important class of organometallic materials, organotin compounds, especially bis(dodecylthio)tin compounds, exhibit unique properties and a wide range of applications in a variety of fields. These compounds not only have excellent thermal stability and corrosion resistance due to the long-chain alkyl sulfur groups in their structures, but also exhibit low toxicity, good biocompatibility, and catalytic activity, and thus have attracted extensive attention from researchers in the fields of plastic stabilizers, catalysts, pesticides, and biomedical materials. The following is a brief overview of the research progress of bis(dodecylthio)tin-based products.

Application of organotin stabilisers in the plastics industry
In the plastics industry, bis(dodecylthio)tin compounds are widely used as heat stabilisers, especially in polyvinyl chloride (PVC) processing. They can effectively inhibit the degradation of PVC due to dehydrogen chloride reaction during high temperature processing or long-term use, thus extending the service life of the products. In recent years, as environmental regulations have become more stringent, researchers are working to develop low-toxicity, high-efficiency alternatives to reduce the environmental and health risks that may be associated with traditional tin heat stabilisers. Improving the ecological compatibility of compounds by adjusting the molecular design, e.g. introducing biodegradable groups, is an important direction of current research.

Innovative applications in catalysis
Bis(dodecylthio)tin compounds show great potential as Lewis acid catalysts in organic synthesis due to their unique coordination ability and catalytic properties. They can promote a variety of organic reactions, including esterification and polymerisation reactions, etc. Especially in the field of green chemistry, the search for environmentally friendly catalysts has become a hot topic. Research focuses on how to optimise their catalytic efficiency and selectivity while reducing the generation of by-products for more efficient and sustainable chemical synthesis processes.

New explorations in biomedical materials
Although organotin compounds have relatively few applications in the biomedical field, research in recent years has begun to reveal their potential in antibacterial and anti-tumour applications. Bis(dodecylthio)tin compounds have been investigated as a basis for the design of novel drugs, especially in antifungal drugs and anticancer therapies, due to their specific biological activities. By precisely modulating the structure of organotin molecules, scientists aim to develop novel drug candidates that are both effective in killing pathogens and less toxic to normal cells.

Environmental impact and sustainability
Considering the potential impacts that organotin compounds may have on the environment and ecosystems, in particular the bioaccumulation and persistence of some organotin compounds, research on their environmental behaviour and ecotoxicology is also receiving increasing attention. Scientists are endeavouring to develop more environmentally friendly alternatives and to promote the development of organotin-based products in a more sustainable direction by comprehensively evaluating the environmental impacts of these materials from production to disposal through life cycle assessment.

Conclusion
In summary, the progress of research on bis(dodecylthio)tin products shows that through continuous optimisation of molecular structure and properties, these organotin compounds are gradually overcoming environmental and safety challenges while maintaining their original advantages, and moving towards greener, more efficient and multifunctional directions. Future research will focus more on balancing environmental friendliness, biocompatibility and high performance to meet the demand for high-quality materials in different fields, while protecting the Earth’s ecological environment and promoting sustainable development.
extended reading：

Dioctyltin dilaurate (DOTDL) – Amine Catalysts (newtopchem.com)

Suppliers of Bis(dodecylthio)dimethyltin

Finding reliable suppliers of bis(dodecylthio)dimethyltin involves meticulous research of manufacturers, distributors and chemical trading platforms in the market. Below are a few key steps and recommended channels to help you effectively enquire and target suitable suppliers:

1. Use professional chemical platforms
GaiderChem.com: As a well-known chemical information and trading website, GaiderChem.com provides a wealth of supplier resources, including information on many suppliers of bis(dodecylthio)dimethyltin, such as price, specification, company reputation, etc. Users can filter suppliers according to their needs and directly ask for quotations online or contact suppliers.
2. Browse the websites of leading companies in the industry
Kramer Shanghai: Based on previous records, Kramer Shanghai offers a wide range of organotin compounds, including similar products. Visiting its official website, you can enquire about the supply of dimethyltin disulfide isooctyl acetate and other products, and make use of its sales hotline or enterprise QQ to communicate directly and get the latest supply information and quotations.
3. Alibaba Chemical Market
Alibaba has a large number of chemical suppliers, enter the keyword “bis(dodecylthio)dimethyltin”, you can find the corresponding supplier list. The platform usually displays suppliers’ credit ratings, transaction records, contact information, etc., which makes it easy for buyers to compare and choose. Remember to check the qualifications of the suppliers, such as whether they have passed the ISO quality management system certification to ensure product quality.
4. Directly contact the manufacturer
Although Hubei Dongcao Chemical Technology Co., Ltd. and Hubei Nona Technology Co., Ltd. do not directly mention bis(dodecylthio)dimethyltin, they may have production lines of related products or be able to provide customised services as professional chemical manufacturers. A direct visit to the company’s official website or enquiry by phone or email may reveal specific product information they can provide.
5. Consider customised services
If standard products do not meet specific needs, consider contacting a supplier like Xinden Chemical Materials (Shanghai) Co. Ltd. who offers a wide range of organostannic compounds, including thiomethyltin, has customised production capabilities, and may be able to produce bis(dodecylthio)dimethyltin according to your requirements.
Things to consider when making enquiries:
Verify supplier qualifications: Confirm whether the supplier has a legal business licence, safety production permit and environmental qualifications, etc.
Quality standards: Ask about product purity and test reports to ensure compliance with industry standards or specific application requirements.
Price and payment terms: Compare the offers of different suppliers and find out the minimum order quantity, payment methods and transport costs.
After-sales service: Understand the supplier’s return and exchange policy and technical support capability.
Through the above channels, you can systematically collect information, compare and select the bis(dodecylthio)dimethyltin supplier that best meets your needs. Remember to make full communication and confirmation before the transaction to ensure the smooth procurement process.

extended reading：

Dioctyltin dilaurate (DOTDL) – Amine Catalysts (newtopchem.com)

Bis(dodecylthio)organotin compounds market price analysis and influencing factors

In the field of fine chemicals and materials science, bis(dodecylthio)organostannic compounds, as an important class of functional chemicals, are subject to price fluctuations that directly affect the cost control and market strategies of downstream industries. With their unique chemical stability and catalytic activity, these compounds play a key role in various fields such as polymer stabilisers, catalysts and biocides. In this article, we will discuss the current market price status of bis(dodecylthio)organotin compounds, analyse the key factors affecting their price trends, and look into the future price trends.

Market Price Status
The specific price of bis(dodecylthio)organostannic compounds is affected by a variety of factors, including raw material costs, production technology, market demand, policies and regulations, and the international economic environment. In the current market, the price range of such compounds is relatively broad, depending on the quality, purity, brand and purchase volume, the price can range from hundreds of yuan per kilogram to thousands of yuan per kilogram. For example, specific models such as di(dodecylthio)dioctyltin have been reported to be priced at $228 per bag, but please note that prices fluctuate with market conditions and this price is for reference only.

Key Factors Affecting Prices
1. Fluctuation of raw material prices
The synthesis of organotin compounds relies on tin metal and other organic raw materials such as dodecanethiol. As a base metal, the fluctuation of the international market price of tin directly affects the production cost of organotin compounds. In addition, changes in the price of oil will also indirectly affect the cost of organic raw materials, which will be transmitted to the price of the final product.

2. Supply and demand
Market supply and demand conditions are the most basic factors determining commodity prices. As the demand for organic tin compounds grows in industries such as plastics, paints and rubber, if the supply cannot keep up in time, it will lead to price increases. On the contrary, if there is excess capacity, it may cause prices to decline. In particular, the restricted use of certain traditional organotin compounds, driven by environmental regulations, has prompted the market to seek substitutes, which will change the balance between supply and demand for specific organotin compounds.

3. Policies and regulations
The development and implementation of environmental regulations have a profound impact on the organotin compounds market. As the global focus on persistent organic pollutants (POPs) deepens, the use of some toxic organotin compounds, such as tributyltin and triphenyltin, has been restricted or banned. This has prompted manufacturers to turn to the development and production of safer organotin compounds, such as bis(dodecylthio)organotin, and regulatory adjustments have often been accompanied by cost increases, which are reflected in end-product prices.

4. Production technology and capacity
Advances in production technology can reduce costs and improve efficiency, exerting downward pressure on prices. However, the reality of large initial technology investments and high technical barriers may also lead to price increases in the short term. In addition, uneven distribution of global production capacity and high concentration of production may also exacerbate price volatility, especially if there are supply disruptions in major producing countries.

5. International trade environment
International trade policies, tariff changes and exchange rate fluctuations can affect the import and export costs of organotin compounds, which in turn affects their prices. For example, trade frictions may lead to higher raw material import costs and lower competitiveness of exported products, and price fluctuations are inevitable.

Outlook for future price trends
Looking ahead, as global environmental protection requirements continue to improve, it is expected that bis(dodecylthio)organotin compounds complying with the latest environmental standards will become more popular and demand will continue to grow. At the same time, technological innovation and optimisation of production processes will help reduce costs, but fluctuations in raw material prices, policy adjustments and uncertainty in the global economic situation will remain key variables affecting prices. Therefore, the price trend will be a dynamic and balanced process, requiring close attention to the changes in the above factors.

In conclusion, the price analysis of bis(dodecylthio)organotin compounds is a complex process that requires comprehensive consideration of a variety of factors. For the relevant enterprises, understanding the driving mechanism behind the price and adjusting production strategy and supply chain management at the right time will be the key to responding to market changes and maintaining competitiveness.

extended reading：

Dioctyltin dilaurate (DOTDL) – Amine Catalysts (newtopchem.com)