3,5-Dichlorobenzoic acid → 3,5-Dichlorobenzoyl chloride

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It has been known that 3,5-dichloro-α-methylstyrene can be produced by reacting thionyl chloride with 3,5-dichlorobenzoic acid to obtain 3,5-dichlorobenzoyl chloride and then reacting methanol with 3,5-dichlorobenzoyl chloride to obtain methyl-3,5-dichlorobenzoate and reacting methylmagnesium chloride with methyl-3,5-dichlorobenzoate in ether and then, hydrolyzing the product with a diluted hydrochloric acid and dehydrating the product over sodium bisulfate, in for example, Journal of the American Chemical Society 73 January 1951, page 455-456. However, this process is not advantageous as an industrial process because many reaction steps are needed for producing methyl3,5-dichlorobenzoate and a complicated reaction step is included in these steps for producing the starting material and the hydrolysis and the dehydration should be separately carried out.

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