申请人:The Dow Chemical Company
公开号:US05071465A1
公开(公告)日:1991-12-10
Dibenzo[d,g][1,3]dioxocin-6-carboxylic acids substituted by methyl or ethyl or a moiety --CH.sub.2 CH.sub.2 -- at the 12-position and optionally substituted at other positions, such as methyl 4'-chlorospiro(cyclopropane-1,12'(12'H)-dibenzo[d,g][1,3]dioxocin)-6'-carb oxylic acid, and their agriculturally acceptable esters, amides, and salts are useful for the control of undesirable vegetation. The 1,1-diarylcyclopropane intermediates required for the spirocyclopropane compounds can be prepared from appropriately substituted 1,1-diarylethene procursors by reaction with phenylthiomethyl lithium reagent.
甲基或乙基或一个基团--CH.sub.2 CH.sub.2 --置于12位,并在其他位置可选择性地置换的二苯并[d,g][1,3]二噁烷-6-羧酸,例如甲基4'-氯螺[cyclopropane-1,12'(12'H)-二苯并[d,g][1,3]二噁烷]-6'-羧酸及其农业上可接受的酯,酰胺和盐,可用于控制不良杂草。制备螺环丙烷化合物所需的1,1-二芳基环丙烷中间体可以通过与苯基硫甲基锂试剂反应的适当取代的1,1-二芳基乙烯前体制备。