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    • 5. 发明授权
    • Preparation of cyclopropane esters
    • 制备环丙烷酯
    • US5731475A
    • 1998-03-24
    • US826650
    • 1997-04-04
    • Martin Charles BowdenMichael Drysdale Turnbull
    • Martin Charles BowdenMichael Drysdale Turnbull
    • B01J21/16B01J31/02B01J31/04C07B61/00C07C20060101C07C41/60C07C43/32C07C67/27C07C67/30C07C67/317C07C69/65C07C69/743C07C69/747C07C43/30
    • C07C43/32C07C69/65C07C69/743
    • There is disclosed a process for the preparation of a lower alkyl ester of 3-(2-chloro-3,3,3-trifluoroprop-1-en-1-yl)-2,2-dimethylcyclopropane carboxylic acid which comprises the steps of (a) reacting a compound of formula: CF.sub.3 --CXCl--CH(OH)--CH.dbd.C(CH.sub.3).sub.2 (I) wherein X is chloro or bromo, with a tri-lower-alkyl orthoacetate containing up to four carbon atoms in each alkyl groups in the presence of at least a catalytic amount of an acid catalyst at an elevated temperature for a sufficient time to obtain a compound of formula: CF.sub.3 --CXCl--CH.dbd.CH--C(CH.sub.3).sub.2 --CH.sub.2 CO.sub.2 R (III) wherein R is an alkyl group containing up to four carbon atoms, and (b) treating said compound of formula (III) with at least one molar equivalent of a base to obtain said alkyl ester of 3-(2-chloro-3,3,3-trifluoroprop-1-en-1-yl)-2,2-dimethylcyclopropane carboxylic acid. The products are useful as intermediates for insecticides.
    • 公开了制备3-(2-氯-3,3,3-三氟丙-1-烯-1-基)-2,2-二甲基环丙烷羧酸的低级烷基酯的方法,该方法包括以下步骤: (a)使其中X是氯或溴的式:CF 3 -CClCl-CH(OH)-CH = C(CH 3)2(I)的化合物与含有至多四个碳原子的三低级烷基原乙酸酯反应 每个烷基在至少一种催化量的酸催化剂存在下在升高的温度下持续足够的时间以获得式CF 3 -CClCl-CH = CH-C(CH 3)2 -CH 2 CO 2 R(III)的化合物,其中 R是含有至多4个碳原子的烷基,和(b)用至少一摩尔当量碱处理式(III)化合物,得到所述3-(2-氯-3,3, 3-三氟丙-1-烯-1-基)-2,2-二甲基环丙烷羧酸。 该产品可用作杀虫剂的中间体。
    • 6. 发明授权
    • Preparation of cyclopropane esters
    • 制备环丙烷酯
    • US5723649A
    • 1998-03-03
    • US776549
    • 1997-01-31
    • Martin Charles BowdenStephen Martin Brown
    • Martin Charles BowdenStephen Martin Brown
    • C07C67/333C07C67/54C07C69/743C07C69/747C07C69/74
    • C07C69/743
    • The invention provides an improved process for the preparation of a lower alkyl ester of 3-(2-chloro-3,3,3-trifluoroprop-1-en-1-yl)-2,2-dimethylcyclopropane carboxylic acid in which the corresponding lower alkyl ester of a carboxylic acid selected from 6-bromo-6-chloro-3,3-dimethyl-7,7,7-trifluorohept-2-enoic acid and 6,6-dichloro-3,3-dimethyl-7,7,7-trifluorohept-2-enoic acid is treated with an alkali metal lower alkoxylate in the presence of an aromatic hydrocarbon solvent under conditions under which the lower alcohol of the alkoxylate is removed from the reaction mixture by distillation with the aromatic solvent. The products are useful as intermediates in the manufacture of pyrethroid insecticides.
    • PCT No.PCT / GB95 / 02570 Sec。 371日期1997年1月31日 102(e)日期1997年1月31日PCT提交1995年11月2日PCT公布。 WO96 / 16018 PCT出版物 日期:1996年5月30日本发明提供了制备3-(2-氯-3,3,3-三氟丙-1-烯-1-基)-2,2-二甲基环丙烷羧酸的低级烷基酯的改进方法 其中相应的羧酸的低级烷基酯选自6-溴-6-氯-3,3-二甲基-7,7,7-三氟庚-2-烯酸和6,6-二氯-3-三氟甲基 - 二甲基-7,7,7-三氟庚-2-烯酸在芳族烃溶剂存在下用碱金属低级烷氧基化物处理,在该条件下,通过蒸馏从反应混合物中除去烷氧基化物的低级醇, 芳香族溶剂。 该产品可用作制造拟除虫菊酯杀虫剂的中间体。