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    Production of compounds of the axerophthylidene series
    3.
    发明专利
    Production of compounds of the axerophthylidene series 未知

    公开(公告)号：GB974890A

    公开(公告)日：1964-11-11

    申请号：GB1898463

    申请日：1963-05-14

    Applicant: BASF AG

    Inventor： SARNECKI WILHELM ,  NUERRENBACH AXEL ,  REIF WERNER

    IPC: C07C17/16

    Abstract: Compounds of the axerophthylidene series are obtained by reacting an ester of vitamin A alcohol with (a) a triaryl phosphine and a proton donor or with an acid salt of a triaryl phosphine, and with (b) an oxo compound and a proton acceptor. The proton donor may be an acid which forms a salt with the triaryl phosphine, and the proton acceptor may be an alkali metal or alkaline earth metal hydroxide, amide, enolate of a ketone, alcoholate, ammonia, an amine or an organo-metallic compound. The reaction may be carried out at -50 DEG to 100 DEG C. in a solvent. In examples an ester is obtained from vitamin A acetate and palmitate and b -formylcrotonic acid ethyl ester using triphenyl phosphonium hydrogen sulphate, triphenyl phosphine and p-toluenesulphonic acid, triphenyl phosphonium bromide, and triphenyl phosphine and hydrochloric acid, and sodium methylate and methanolic potassium hydroxide; and b -carotene is obtained from vitamin A acetate, triphenyl phosphonium hydrogen sulphate, vitamin A aldehyde and sodium methylate.

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