Дихлордифенилметан

Description

Dichlorodiphenylmethane (α,α-dichlorodiphenylmethane, benzophenone dichloride) is a geminal dichloride based on diphenylmethane: both chlorine atoms are located on one sp3 carbon bonded to two phenyl rings. Refers to benzhydryl halides, active alkylating reagents in organic synthesis. The name "benzophenone dichloride" reflects the formal origin of the molecule - the replacement of the carbonyl oxygen of benzophenone with two chlorine atoms.

Basic Attributes

• CAS No.: 2051-90-3
• Chemical formula: C13H10Cl2
• Synonyms: Diphenyldichloromethane, DPM, α,α-dichlorodiphenylmethane, [Dichloro(phenyl)methyl]benzene
• Molecular weight: 237.12
• Exact weight: 237.12
• EU number: 218-134-5
• UNII: 81FEZ29AK6
• NSC Number: 37425
• DSSTox ID: DTXSID9062148
• HS code: 2903999090
• PSA: 0
• XLogP3: 4.36530

Physico-chemical characteristics

• Appearance: transparent light yellow liquid
• Density: 1.243 g/cm3 at 20 °C
• Melting point: 190°C (with decomposition)
• Boiling point: 193 °C at 32 Torr
• Flash point: above 230°F
• Refractive index: n20/D 1.605
• Solubility in water: Reacts with water; soluble in ether, benzene, ethanol, toluene
• Steam pressure: 0.00152 mm Hg. Art. at 25 °C

Low vapor pressure at 25 °C indicates low volatility of the substance at room temperature, which reduces the risk of vapor accumulation in the air of the work area during normal storage in a closed container.

Scope of application

Used as an alkylating reagent and intermediate product of organic synthesis: a source of benzhydryl fragment in the preparation of tetraphenylethylene, diphenylmethane imine hydrochloride and benzoic anhydride. Serves as a pharmaceutical intermediate and reagent for the synthesis of agrochemicals. It is also noted as a photodegradation product of the organochlorine pesticides dicofol and DDT, formed during the decomposition of their aromatic fragments in the environment, which makes it an indicator compound in the environmental monitoring of soils and water bodies treated with these pesticides.

Safety Information

• Packing level: II
• Hazard category: 8
• Transport codes: UN 3265, 8/PAGE 2

Category 8 means corrosive to skin and mucous membranes: gloves, safety glasses or a shield, and a ventilated area are required when working.

Storage and transportation conditions

Store at temperatures below +30 °C, in sealed containers, in a dry place. Reacts with water (hydrolysis of the C–Cl bond with the release of hydrogen chloride), so isolate from moisture; transported as a corrosive substance of class 8, packing group II, UN code 3265. In case of spillage, collect with a dry sorbent, do not allow it to enter water bodies and sewers, dispose of used containers as halogen-containing waste through a specialized organization.