Nippon Gohsei Kagaku Kogyo Kabushiki Kaisha

Mitsuhiro Goi

Masahiko Miyashita

Tokio Hashimoto

Process for preparing sorbic acid which comprises contacting .gamma.-vinyl-.gamma.-butyrolactone with at least one catalyst selected from the group consisting of (A) solid acids, (B) transition metal oxides, (C) metals of Group VIII of the Periodic Table and (D) halides of metals of Groups I-B, II-B, III-B, IV-B, V-B, VI-B and VIII of the Periodic Table.

Process for preparing sorbic acid

Process for preparing succinylsuccinic acid diesters by subjecting .gamma.-haloacetoacetic acid esters to dimerization in the presence of a base in a mixed medium of alcohol and water containing a specific amount of a water-immiscible organic compound. The succinylsuccinic acid diesters with good quality can be prepared in high yields and can be employed effectively as intermediates for quinacridone pigment.

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Hirakata, Japan

Mitsuhiro Goi