2-Chlorobenzaldehyde (o-chlorobenzaldehyde) is an organic compound with the formula . It is one of three isomeric monochlorinated benzaldehyde. 3-Chlorobenzaldehyde and 4-chlorobenzaldehyde are the other isomers. Whereas benzaldehyde is prone to autoxidation, the 2-chloro derivatives are more air-stable.

Synthesis and uses It is produced by hydrolysis of 2-chlorobenzal chloride:

2-Chlorobenzaldehyde is used in production of CS gas. It reacts with malononitrile to form CS.

2-Chlorobenzaldehyde is used in the synthesis of: Clopidogrel, Amlodipine, Levamlodipine, Zotepine, Clobenzorex, Tradipitant, Lodaxaprine, Bay-k-9320, SK 609, Sephin 1 & YC 170.

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