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    • 23. 发明授权
    • Preparation of .beta.-hydroxycarboxylates
    • β-羟基羧酸盐的制备
    • US5294731A
    • 1994-03-15
    • US36023
    • 1993-03-23
    • Joachim PaustWolfgang Siegel
    • Joachim PaustWolfgang Siegel
    • C07C67/343C07C69/76C07C69/66
    • C07C67/343
    • A process for the preparation of .beta.-hydroxycarboxylates of the general formula I ##STR1## in which R.sup.1 and R.sup.2 individually denoteC.sub.1 -C.sub.20 alkyl optionally substituted by C.sub.1 -C.sub.8 alkoxy and/or halogen, C.sub.3 -C.sub.20 alkoxycarbonylalkyl, C.sub.2 -C.sub.20 alkenyl, C.sub.5 -C.sub.30 acetalalkenyl, aryl optionally mono- to penta-substituted by C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.8 alkoxy, and/or halogen, C.sub.7 -C.sub.20 aralkyl, C.sub.7 -C.sub.20 aralkenyl, hetaryl, C.sub.3 -C.sub.20 cycloalkyl, or C.sub.4 -C.sub.20 cycloalkylalkyl,or together denote a C.sub.2 -C.sub.8 alkylene chainand one or other of R.sup.1 and R.sup.2 denotes hydrogen, andR.sup.3 denotes hydrogen, C.sub.1 -C.sub.20 alkyl, C.sub.2 -C.sub.20 alkenyl, aryl optionally mono- to penta-substituted by C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.8 alkoxy, and/or halogen, C.sub.7 -C.sub.20 aralkyl, C.sub.3 -C.sub.20 cycloalkyl, or C.sub.4 -C.sub.20 cycloalkylalkyl, andR.sup.4 denotes C.sub.1 -C.sub.20 alkyl, C.sub.4 -C.sub.20 alkenyl, C.sub.7 -C.sub.20 aralkyl, C.sub.3 -C.sub.20 cycloalkyl, or C.sub.4 -C.sub.20 cycloalkylalkyl,by the reaction of carbonyl compounds of the general formula II ##STR2## in which R.sup.1 and R.sup.2 have the meanings stated above, with .alpha.-bromocarboxylates of the general formula III ##STR3## in which R.sup.3 and R.sup.4 have the meanings stated above, wherein the reaction with zinc is carried out in methylene chloride at a temperature ranging from 0.degree. to 50.degree. C.
    • 制备通式I(I)的β-羟基羧酸盐的方法,其中R 1和R 2各自表示任选被C 1 -C 8烷氧基和/或卤素取代的C 1 -C 20烷基,C 3 -C 20烷氧基羰基烷基, C20烯基,C5-C30乙缩醛基,C1-C8烷基,C1-C8烷氧基和/或卤素任选被一至五取代的芳基,C 7 -C 20芳烷基,C 7 -C 20芳烯基,杂芳基,C 3 -C 20环烷基或 C 4 -C 20环烷基烷基,或一起表示C 2 -C 8亚烷基链,R 1和R 2中的一个或其中R 1表示氢,R 3表示氢,C 1 -C 20烷基,C 2 -C 20链烯基,任选地被C1任意单 - 五取代的芳基 C 8烷基,C 1 -C 8烷氧基和/或卤素,C 7 -C 20芳烷基,C 3 -C 20环烷基或C 4 -C 20环烷基烷基,R 4表示C 1 -C 20烷基,C 4 -C 20烯基,C 7 -C 20芳烷基, C20环烷基或C4-C20环烷基烷基,通过其中R1和R2具有上述含义的通式II(II)的羰基化合物与α-溴代羰基 通式III的化合物(III)其中R3和R4具有上述含义,其中与二氯甲烷的反应在0℃至50℃的温度下进行。