5-Aminobenzimidazolones

Structural formula

Physical competition number	028T
Molecular formula	C7H7N3O
Molecular weight	149.15
label	5-amino-1,3-dihydro-2H-benzimidazol-2-one, 5-Aminobenzimidazolones, 5-amino-1,3-dihydro-2H-Benzimidazol-2-one

Numbering system

CAS number:95-23-8

MDL number:MFCD00053555

EINECS number:202-401-8

RTECS number:None

BRN number:None

PubChem ID:None

Physical property data

1. Character: light yellow or white crystal.

2. Density (g/mL, 20℃): Undetermined

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

4. Melting point (ºC): 239-244

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

6. Boiling point (ºC, KPa): Undetermined

7. Refractive index: Undetermined

8. Flash point (ºC): Undetermined

9. Specific rotation (º): Undetermined

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

11. Vapor pressure (mmHg, ºC): Undetermined

12. Saturated vapor pressure (kPa, ºC): Undetermined

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

14. Critical temperature (ºC): Undetermined

15. Critical pressure (KPa): Undetermined

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

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

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

19. Solubility: Undetermined

Toxicological data

None

Ecological data

None

Molecular structure data

1. Molar refractive index: 40.26

2. Molar volume (cm³/mol): 109.3

3. Isotonic specific volume (90.2K ): 302.0

4. Surface tension (dyne/cm): 58.1

5. Polarizability (10-24cm3): 15.96

Compute chemical data

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

2. Number of hydrogen bond donors: 3

3. Number of hydrogen bond acceptors: 2

4. Number of rotatable chemical bonds: 0

5. Number of tautomers: 3

6. Topological molecule polar surface area 67.2

7. Number of heavy atoms: 11

8. Surface charge: 0

9. Complexity: 183

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

None

Storage method

None

Synthesis method

Benzimidazolone is produced by solid-phase reaction of o-phenylenediamine and urea at 150-250°C to deaminate the hydrogen ring, and then undergoes nitration and reduction to obtain it.

Purpose

Mainly used to prepare yellow to orange organic pigments.