BENZIL

PRODUCT IDENTIFICATION
CAS NO. 134-81-6

BENZIL

EINECS NO. 205-157-0
FORMULA C6H5COCOC6H5
MOL WT.

210.23

H.S. CODE 2914.30
TOXICITY  
SYNONYMS Bibenzoyl; Dibenzoyl;
Diphenylethanedione; Diphenylglyoxal; 1,2-Diphenylethane-1,2-dione; 1,2-Diphenylethanedione; Diphenyl-a,b-diketone;
RAW MATERIALS

 

CLASSIFICATION

 
 

PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE yellow crystals
MELTING POINT 95 C
BOILING POINT 346 - 348 C
SPECIFIC GRAVITY

1.23

SOLUBILITY IN WATER Insoluble (but soluble in ethanol and ether)
AUTOIGNITION  
pH  
VAPOR PRESSURE  
NFPA RATINGS Health: 1 Flammability: 1 Reactivity: 0
FLASH POINT

 

STABILITY Stable under ordinary conditions

APPLICATIONS
Diketone is a molecule which contains two ketone carbonyl groups. Diacetyl (CH3COCOCH3), 2,3-butadione, is the simplest aliphatic diketone. It is an alpha-diketone which has two ketone groups side-by-side. Usually, alpha-diketone imparts a carmel like or buttery flavor. Diketone compounds take a role in creating various fragrances. Bezil (C6H5COCOC6H5) is an aromatic diketone, the fundamental structure of photo sensitive molecule which is broken down into free radicals upon exposure to ultraviolet radiation. Acetoacetone is a beta-diketone which two ketones are separated only by one carbon. The beta-ketone is stable as a conjugated enol rather than a diketone due to the delocalization which makes the counterion more stable and less likely to regain the proton. Ascorbic acid is an example of enol compound. Enol compounds form complexes with many transition metal ions. These compounds are readily soluble in organic solvents. They are widely used as chelating agents, ligands, and catalyst precursors. Acetoacetic acid and its esters contain active methylene groups which have relatively acidic alpha-protons due to H atom adjacent to two carbonyl groups. The reactivity of its methylene group provide the sequence of reactions of alkylation, hydrolysis of the esters and decarboxylation resulting in substituted ketones. Acetoacetic acid derivatives are important aliphatic parts adjoining azo dyes and pigments. Aacetoacetate is one of Ketone bodies which are the end-products of rapid or excessive fatty acid breakdown in the human body. Para-benzoquinone and its derivatives belong to 1,4-diketone family. Benzoquinone is used as an oxidizing agent in organic chemistry and is a common constituent of biologically molecules like Vitamin K1. Quinones serves as electron acceptors in electron transport chains such as in photosynthesis, and aerobic respiration. Diketene derivatives find versatile applications in making biomolecules, agrochemicals, dyes, pigments, pharmaceuticals including vitamins, and stabilizers for PVC and polyester. They are used as components for fragrances and as solvents. Diketones undergo the reversible and irreversible addition reactions include;
  • Aldol Reactions
  • Alkylation of Enolate Anions
  • Clemmensen Reduction
  • Cyanohydrin Formation
  • Enamine Formation
  • Hemiacetal and Acetal Formation
  • Hydration Formation
  • Imine Formation
  • Wolff-Kishner Reduction
SALES SPECIFICATION

APPEARANCE

 yellow crystals

ASSAY

99.0% min

MELTING POINT 94 C min

RESIDUE ON IGNITION

0.1% max

LOSS ON DRYING

0.5% max

TRANSPORTATION
PACKING 25kgs in bag
HAZARD CLASS  
UN NO.  
OTHER INFORMATION
Photoinitiators are compounds that break down into free radicals upon exposure to ultraviolet radiation. Photoinitiators undergo a unimolecular bond cleavage upon irradiation to yield free radicals (Benzoin Esters; Benzil Ketals; alpha-Dialkoxy Acetophenones; alpha-Hydroxy-alkylphenones; alpha-Amino Alkyl- phosphine; Acylphosphine Oxides). Another type of photoinitiators undergo a bimolecular reaction where the excited state of the photoinitiator interacts with a second molecule (a coinitiator) to generate free radicals(Benzo Phenones,amines; Thioxanthones,amines; Titanocenes). Photoinitiators are widely applied in UV curing inks, wood coatings, paper coatings, optical fiber, PCB, screen printing , paper varnish and other surface coatings.