Method for preparing 4-hydroxy-3-methyl-2-(2-propynyl)-2-cyclopentenolone
    1.
    发明授权
    Method for preparing 4-hydroxy-3-methyl-2-(2-propynyl)-2-cyclopentenolone 失效
    4-羟基-3-甲基-2-(2-丙炔基)-2-环戊烯醇的制备方法

    公开(公告)号:US4343953A

    公开(公告)日:1982-08-10

    申请号:US159497

    申请日:1980-06-16

    摘要: The present invention relates to a novel method for producing cyclopentenolone of the formula (I), ##STR1## which is a useful intermediate for producing agricultural chemicals, which comprises reacting an acetonedicarboxylic ester of the formula (VII), ##STR2## wherein R is a C.sub.1 -C.sub.6 alkyl group, with 2-propynyl chloride in the presence of magnesium alkoxide and in the presence of alkali iodide to obtain novel mono-(2-propynyl)-substituted acetonedicarboxylic ester of the formula (VI), ##STR3## wherein R is as defined above; hydrolyzing the mono-(2-propynyl)-substituted acetonedicarboxylic ester of the formula (VI) under alkaline conditions with an alkali and then reacting the hydrolyzed product with methylglyoxal of the formula, ##STR4## to obtain novel .gamma.-diketone of the formula (V), ##STR5## and ring-closing the .gamma.-diketone of the formula (V) under alkaline condition.

    摘要翻译: 本发明涉及一种制备式(I)的环戊烯醇酮的新方法,其是用于生产农药的有用的中间体,其包括使式(VII)的丙酮二羧酸酯, (Ⅶ)其中R是C 1 -C 6烷基,与2-丙炔基氯在烷氧基镁存在下,在碱金属碘化物的存在下,得到式(Ⅵ)的新型单 - (2-丙炔基) - 取代的丙酮二羧酸酯 ),其中R如上定义; 在碱性条件下用碱水解式(Ⅵ)的单 - (2-丙炔基) - 取代的丙二酸二羧酸酯,然后使水解产物与下式的甲基乙二醛反应,得到式(Ⅵ)的新的γ-二酮 V),(V)并在碱性条件下闭合式(V)的γ-二酮。

    Insecticides
    4.
    发明授权
    Insecticides 失效
    杀虫剂

    公开(公告)号:US4053625A

    公开(公告)日:1977-10-11

    申请号:US634850

    申请日:1975-11-24

    CPC分类号: C07D207/448 C07D207/452

    摘要: A cyclopropanecarboxylic acid ester of the formula (I), ##STR1## wherein R.sub.1 is a hydrogen atom, methyl group or a fluorine, chlorine or bromine atom, R.sub.2 is a fluorine, chlorine or bromine atom, and each of R.sub.3 and R.sub.4 is independently a hydrogen atom, a C.sub.1 -C.sub.3 alkyl, C.sub.2 -C.sub.3 alkenyl or C.sub.2 -C.sub.3 alkynyl group, an alkyl- or halogen-substituted aryl, unsubstituted aryl group or an aralkyl group, which possesses various useful insecticidal and acaricidal activities and can be prepared by reacting an alcohol, halide or arylsulfonate compound of the formula (II), ##STR2## wherein R.sub.3 and R.sub.4 have the same meanings as defined above and A is a hydroxyl group, a halogen atom or an arylsulfoxy group, with a cyclopropanecarboxylic acid of the formula (III), ##STR3## wherein R.sub.1 and R.sub.2 have the same meanings as defined above, or its reactive derivative.