Process for producing phthalide

Details Process for producing phthalide Process for producing phthalide

C - Chemistry, Metallurgy

07

D

260/366.2

C07D 307/88 (2006.01)

Patent

CA 1080726

ABSTRACT OF THE DISCLOSURE: The present invention is concerned with a process for the hydrogenolysis of 3-chlorophthalide wherein the formation of undesired by-products is substantially decreased and yields of phthalide of over 90% are obtained. This process which is carried out in the presence of a precious metal catalyst is characterized in that 3-chlorophthalide is subjected to hydrogenolysis in the absence of HCl-acceptors at a temperatures ranging between 50 and 250°C, preferably between 80 and 130°C.

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