P-Chlorobenzal chloride

Problem 11.59 Outline practical laboratory syntheses from benzene or toluene and any needed inorganic reagents of (a) p-chlorobenzal chloride, (b) 2,4-dinitroaniline, (c) w-chlorobenzotrichloride, (d) 2,5-dibromonitrobenzene. ... 

Chlorination catalyst. Phosphorus pentachloride is employed as catalyst for the photochemical chlorination of p-chlorotoluene to p-chlorobenzal chloride. ... 

The ring-chiorinated benzyl chlorides are used ia the preparation of quaternary ammonium salts and as iatermediates for pharmaceuticals and pesticides. p-C. orohen zyl chloride is an iatermediate ia the manufacture of the rice herbicide, Saturn ((S-4-chlorobenzyl)-N,N-diethylthiolcarbamate [28249-77-6] (75). The o- and -chlorobenzal chlorides (l-chloro-2-and 4-dich1 oromethylhenzenes) are starting materials for the manufacture of o- and p- chlo rob enz aldehyde s. 

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