Process for the preparation of cypermethrine isomers
    1.
    发明授权
    Process for the preparation of cypermethrine isomers 失效
    制备CYPERMETHRINE异构体的方法

    公开(公告)号:US5153349A

    公开(公告)日:1992-10-06

    申请号:US601767

    申请日:1990-10-19

    IPC分类号: A01N53/00 C07C255/14

    CPC分类号: A01N53/00

    摘要: The invention relates to a process for the preparation of such isomer mixtures of cypermethrine of the Formula (I) ##STR1## wherein carbon atoms indicated by 1, 3 and .alpha. stand for a chiral carbon atom and the wavy line indicates cis or trans configuration related to the cyclopropane ring--which contains out of the theoretically possible 8-isomers of cypermethrine at least 95% of 1RtransS and 1StransR (Ib) isomer pair or only a mixture of 1RcisC and 1ScisR (Ia) and the isomer pair (Ib) of the ratio (Ia):(Ib)=55:45-25:75 by asymmetric transformation of second order performed in the presence of an amine base and solvent from a starting cypermethrine isomer mixture which contains next to the isomer pair (Ib) cis and other trans isomers or the isomer pair Ia+Ib at an undesired ratio.

    摘要翻译: PCT No.PCT / HU90 / 00006 Sec。 371 1990年10月19日第 102(e)1990年10月19日PCT PCT 1990年1月17日PCT公布。 出版物WO90 / 08132 日本1990年7月26日。本发明涉及一种制备式(I)的氯氰菊酯的异构体混合物的方法,其中由1,3和α表示的碳原子代表手性碳原子 并且波浪线表示与环丙烷环有关的顺式或反式构型,其中含有理论上可能的氯氰菊酯的8-异构体至少95%的1RtransS和1StransR(Ib)异构体对,或仅包含1RcisC和1ScisR(Ia )和通过在胺碱和溶剂的存在下由起始氯氰菊酯异构体混合物进行的二级的不对称转化,比率(Ia):(Ib)= 55:45-25:75的异构体对(Ib)= 55:45-25: 异构体对(Ib)顺式和其他反式异构体或异构体对Ia + Ib处于不期望的比例。

    Process for the preparation of benzyl-ethers
    8.
    发明授权
    Process for the preparation of benzyl-ethers 失效
    苄基醚的制备方法

    公开(公告)号:US06320085B1

    公开(公告)日:2001-11-20

    申请号:US09297824

    申请日:1999-07-13

    IPC分类号: C07C4311

    摘要: The subject matter of the invention is the process for the preparation of mixed ethers of formula I, wherein Ar represents an aromatic or one or more heteroatom-containing moiety, optionally substituted by one or more C1-4 alkoxy, methylenedioxy, C1-4 alkyl, halogen, C1-4 haloalkyl or nitro-group, and/or condensed with a benzene ring; R1 and R2 independently mean hydrogen, C1-4 alkyl, C1-4 haloalkyl, C2-4 alkenyl, phenyl, substituted phenyl, C3-6 cycloalkyl group, R3 means C3-6 alkynyl, optionally substituted by one or more C1-6 alkyl, C3-6 alkenyl, C3-6 alkynyl, C1-6 haloalkyl group, or halogen atom, R3 also means a C1-4 alkyloxy-C1-4 alkyloxy-C1-4 alkyl group. The process comprises the step of reacting the compounds of general formula II with 1 to 3 molar equivalent of the alcohol of general formula IlI in the presence of acid, a Lewis acid, a metal oxide or a metal carbonate, X means hydroxy, halogen or sulphonester leaving group, the resulting ether of general formula I is isolated, if desired, stabilized by the addition of a base and/or an antioxidant; and if desired the excess of the alcohol is recovered.

    摘要翻译: 本发明的主题是制备式I的混合醚的方法,其中Ar表示芳族或一个或多个含杂原子的部分,任选地被一个或多个C 1-4烷氧基,亚甲二氧基,C 1-4烷基 ,卤素,C 1-4卤代烷基或硝基,和/或与苯环缩合; R1和R2独立地表示氢,C1-4烷基,C1-4卤代烷基,C2-4烯基,苯基,取代的苯基,C3-6环烷基,R3表示任选被一个或多个C 1-6烷基取代的C 3-6炔基 C3-6烯基,C3-6炔基,C1-6卤代烷基或卤素原子,R3也表示C1-4烷氧基-C1-4烷氧基-C1-4烷基。 该方法包括在酸,路易斯酸,金属氧化物或金属碳酸盐存在下使通式II的化合物与1至3摩尔当量的通式III的醇反应的步骤,X表示羟基,卤素或 如果需要,通过添加碱和/或抗氧化剂来稳定所得到的通式I的醚; 并且如果需要,回收过量的醇。