Benzal chloride
Benzal chloride is an organic compound with the formula C6H5CHCl2.[1] This colourless liquid is a lachrymator and is used as a building block in organic synthesis.
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Names | |||
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Preferred IUPAC name
(Dichloromethyl)benzene | |||
Other names
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Identifiers | |||
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1099407 | |||
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ChEMBL | |||
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ECHA InfoCard | 100.002.463 | ||
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MeSH | Compounds Benzylidene Compounds | ||
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UNII | |||
UN number | 1886 2810 | ||
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Properties | |||
C7H6Cl2 | |||
Molar mass | 161.03 g/mol | ||
Appearance | Colorless liquid | ||
Density | 1.254 g/cm3, liquid | ||
Melting point | −17 to −15 °C (1 to 5 °F; 256 to 258 K) | ||
Boiling point | 205 °C (401 °F; 478 K) (82 °C at 10 mmHg) | ||
0.25 g/L at 39 °C | |||
Vapor pressure | 0.6 kPa (45 °C) | ||
Hazards | |||
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GHS Signal word | Danger | ||
GHS hazard statements |
H302, H315, H318, H331, H335, H351 | ||
P201, P202, P261, P264, P270, P271, P280, P281, P301+312, P302+352, P304+340, P305+351+338, P308+313, P310, P311, P312, P321, P330, P332+313, P362, P403+233, P405, P501 | |||
Flash point | 93 °C (199 °F; 366 K) | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |||
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Preparation and usage
Benzal chloride is produced by the free radical chlorination of toluene, being preceded in the process by benzyl chloride (C6H5CH2Cl) and followed by benzotrichloride (C6H5CCl3):
- C6H5CH3 + Cl2 → C6H5CH2Cl + HCl
- C6H5CH2Cl + Cl2 → C6H5CHCl2 + HCl
- C6H5CHCl2 + Cl2 → C6H5CCl3 + HCl
Benzylic halides are typically strong alkylating agents, and for this reason benzal chloride is treated as a hazardous compound.
Treatment of benzal chloride with sodium gives stilbene.
Most benzal chloride main industrial use is as a precursor to benzaldehyde. This conversion involves hydrolysis in the presence of base:[2]
- C6H5CHCl2 + H2O → C6H5CHO + 2 HCl
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References
- "BENZAL CHLORIDE". International Programme on Chemical Safety. Retrieved 2007-10-30.
- Lipper, Karl-August; Löser, Eckhard. "Benzyl Chloride and Other Side-Chain Chlorinated Aromatic Hydrocarbons". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.o04_o01.
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