Process for the preparation of alkyl esters of
tetrachloro-2-cyano-benzoic acid
    1.
    发明授权
    Process for the preparation of alkyl esters of tetrachloro-2-cyano-benzoic acid 失效
    制备四氯-2-氰基 - 苯甲酸的烷基酯的方法

    公开(公告)号:US4978768A

    公开(公告)日:1990-12-18

    申请号:US1311

    申请日:1987-01-08

    CPC分类号: C07C255/00

    摘要: Tetrachloro-2-cyanobenzoic acid alkyl esters of formula ##STR1## wherein R is C.sub.1 -C.sub.5 alkyl, can be very conveniently prepared by (a) reacting the ammonium salt of tetrachloro-2-cyanobenzoic acid, in the presence of water and an inert organic solvent, with a hydroxide of formula MOH, wherein M is Na or K, and removing the ammonia evolved, and(b) reacting the resultant salt of the formula ##STR2## wherein M is as defined above, with at least 1 mole of a dialkyl sulfate of formula SO.sub.2 (OR).sub.2 or an alkyl halide of formula RHal, wherein R is as defined above and Hal is Cl, Br, I or F, also in the presence of water and an inert organic solvent.

    摘要翻译: 式(Ia)的四氯-2-氰基苯甲酸烷基酯,其中R是C1-C5烷基,可以非常方便地通过(a)使四氯-2-氰基苯甲酸的铵盐在水和惰性有机物 溶剂与式MOH的氢氧化物反应,其中M是Na或K,并除去放出的氨,和(b)使所得到的式(IMA)的盐与其中M如上所定义的至少1摩尔 式SO2(OR)2的二烷基硫酸盐或式RHal的烷基卤化物,其中R如上所定义,Hal是Cl,Br,I或F,也在水和惰性有机溶剂的存在下进行。