Benzal chloride

Benzal chloride
Names
IUPAC name
Dichloromethylbenzene
Systematic IUPAC name
(Dichloromethyl)benzene
Other names
  • benzyl dichloride
  • benzylidene chloride
  • α,α-Dichlorobenzenea
Identifiers
98-87-3 N
1099407
ChemSpider 13882337 YesY
EC Number 249-854-8
Jmol interactive 3D Image
KEGG C19165 YesY
MeSH Compounds Benzylidene Compounds
PubChem 7411
RTECS number CZ5075000
UNII 222447TR16 N
UN number 1886
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 @10 mm Hg)
0.25 g/L at 39 °C
Vapor pressure 0.6 kPa (45 °C)
Hazards
Toxic (T), Carc. Cat. 2B, Dangerous for the environment (N)
R-phrases 22-23-37/38-40-41
S-phrases 36/37-38-45
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).
N verify (what is YesYN ?)
Infobox references

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.

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

References

  1. "BENZAL CHLORIDE". International Programme on Chemical Safety. Retrieved 2007-10-30.
  2. Karl-August Lipper and Eckhard Löser “Benzyl Chloride and Other Side-Chain Chlorinated Aromatic Hydrocarbons" in Ullmann’s Encyclopedia of Industrial Chemistry, 2011, Wiley-VCH, Weinheim. doi:10.1002/14356007.o04_o01
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