Process and intermediate products for preparing substantially
isomer-pure E-2(2-aryloxymethylene phenyl)-crotonic acid methyl esters
    91.
    发明授权
    Process and intermediate products for preparing substantially isomer-pure E-2(2-aryloxymethylene phenyl)-crotonic acid methyl esters 失效
    用于制备基本上异构体纯的E-2(2-芳氧基亚甲基苯基) - 巴豆酸甲酯的方法和中间产物

    公开(公告)号:US5869733A

    公开(公告)日:1999-02-09

    申请号:US930942

    申请日:1997-10-09

    CPC分类号: C07C69/734

    摘要: A process for the preparation of essentially isomerically pure methyl E-2-(2-aryloxymethylenephenyl)crotonates of the formula Ia ##STR1## where R is an aromatic radical and R' is a C.sub.1 -C.sub.3 -alkyl group, which comprises first converting a suitable methyl 2-(2-aryloxymethylenephenyl)-.alpha.-ketoacetate with an alkyl metal compound of the formula IIIM--CH.sub.2 --R' IIIwhere M is a metal ion equivalent into the corresponding methyl 2-(2-aryloxymethylenephenyl)-.alpha.-hydroxybutyrate of the formula IV, subsequently dehydrating IV in the presence of an acid to give a mixture of methyl E- and Z-2-(2-aryloxymethylenephenyl)crotonates and, subsequently, converting this mixture in the presence of a base in an inert polar solvent into the essentially isomerically pure methyl E-2-(2-aryloxymethylenephenyl)crotonate Ia.

    摘要翻译: PCT No.PCT / EP96 / 01689 Sec。 371日期1997年10月9日第 102(e)1997年10月9日PCT PCT 1996年4月23日PCT公布。 第WO96 / 34847号公报 日期1996年11月7日制备基本上异构体纯的式Iaa的2-(2-芳氧基亚甲基苯基)巴豆酸甲酯的方法,其中R是芳族基团,R'是C 1 -C 3 - 烷基 ,其包括首先用合适的式IIIM-CH2-R'III的烷基金属化合物转化合适的2-(2-芳氧基亚甲基苯基)-α-酮乙酸甲酯,其中M是等价于相应的2-(2-芳氧基亚甲基苯基) )-α-羟基丁酸酯,随后在酸存在下脱水IV,得到E-和Z-2-(2-芳氧基亚甲基苯基)巴豆酸甲酯的混合物,随后在存在下转化该混合物 在惰性极性溶剂中碱化成基本上异构体纯的E-2-(2-芳氧基亚甲基苯基)巴豆酸甲酯Ⅰa。

    Method for producing alkenyl-substituted bis(oxime ether) derivatives
    93.
    发明授权
    Method for producing alkenyl-substituted bis(oxime ether) derivatives 失效
    烯基取代的双(肟醚)衍生物的制备方法

    公开(公告)号:US06417388B1

    公开(公告)日:2002-07-09

    申请号:US09831412

    申请日:2001-05-09

    IPC分类号: C07C22900

    CPC分类号: C07C249/12 C07C251/60

    摘要: The process for preparing alkenyl-substituted bis(oxime ether) derivatives of the formula I where: R1 is unsubstituted C1-C4-alkyl or C2-C4-alkenyl-, C2-C4-alkynyl- or phenyl-substituted methyl; R2, R4 independently of one another are hydrogen or methyl; R3, R5 independently of one another are hydrogen or C1-C4-alkyl, trifluoromethyl or phenyl and X is —C(═CHCH3)—COOCH3, —C(═CHOCH3)—COOCH3, —C(═NOCH3)—COOCH3, —C(═NOCH3)—CONHCH3 or —N(OCH3)—COOCH3, and intermediates which are obtainable by this process are described. Alkenyl-substituted bis(oxime ether) derivatives of the formula I are described in the literature as interesting crop protection agents.

    摘要翻译: 制备式I的烯基取代的双(肟醚)衍生物的方法,其中:R1是未取代的C1-C4-烷基或C2-C4-烯基 - ,C2-C4-炔基或苯基取代的甲基; R2,R4独立地 其中R 3,R 5彼此独立地是氢或C 1 -C 4烷基,三氟甲基或苯基,X是-C(= CHCH 3)-COOCH 3,-C(= CHOCH 3)-COOCH 3,-C( = NOCH 3)-COOCH 3,-C(= NOCH 3)-CONHCH 3或-N(OCH 3)-COOCH 3,并且可以通过该方法获得的中间体。 式I的烯基取代的双(肟醚)衍生物在文献中描述为有趣的作物保护剂。