Patents Assigned to Kawaguchi Chemical Co., Ltd.
  • Process for preparing 2,2-dimethoxy-2-phenylacetophenone
    Patent number: 5081307
    Abstract: 2,2-Dimethoxy-2-phenylacetophenone is prepared by reacting benzil with dimethyl sulfate and alkali metal methylate in a nonpolar organic solvent (e.g. xylene, cyclohexane) in the presence of one or more of catalysts selected from the group consisting of polyethylene glycol, a polyethylene glycol dialkyl ether and a crown ether. The reaction can be carried out more preferably in the presence of diglyme or triglyme or a mixture of diglyme or triglyme and polyethylene glycol.
    Type: Grant
    Filed: July 5, 1990
    Date of Patent: January 14, 1992
    Assignee: Kawaguchi Chemical Co., Ltd.
    Inventors: Soichi Kitamura, Masaru Tomioka, Hidekuni Gotoh