Process for the production of methine dyes
    40.
    发明授权
    Process for the production of methine dyes 失效
    生产甲状腺素的方法

    公开(公告)号:US3890307A

    公开(公告)日:1975-06-17

    申请号:US34702473

    申请日:1973-04-02

    CPC classification number: C09B23/145

    Abstract: This invention is concerned with a process for the production of methine dyes which comprises heating equimolar amounts of a 1alkyl or phenyl substituted 1-phenylhydrazine and a ketone, subsequently adding to the reaction mixture an equimolar amount of a dialkyl aminoarylaldehyde or indole carboxaldehyde, heating the reaction mixture, and recovering said methine dyestuff.

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