申请人:The Dow Chemical Company
公开号:US04938790A1
公开(公告)日:1990-07-03
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.
二苯并[d,g][1,3]二噁喃-6-羧酸在12位被甲基或乙基或一种基团--CH.sub.2 CH.sub.2--取代,并且在其他位置可选择性地被取代,例如甲基4'-氯螺(cyclopropane-1,12'(12'H)-dibenzo[d,g][1,3]二噁喃)-6'-羧基酸,以及它们的农业可接受的酯、酰胺和盐对于控制不良植被是有用的。用于螺环丙烷化合物的1,1-二芳基环丙烷中间体可以通过与苯硫甲基锂试剂反应制备,该试剂由适当取代的1,1-二芳基乙烯前体制备而成。