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用具有不同烷硫基的2－双烷硫基亚甲基－5，5－二甲基－1，3－环已二酮与烯丙基、2－甲基烯丙基、苯基卤化镁等Grignard试剂反应，对加成反应取向进行了初步考察．2－双烷流基亚甲基－5，5－二甲基－1，3－环已二酮与烯丙基和2－甲基烯丙基的加成均得到1，2－加成产物；2－二甲硫基亚甲基－5，5－二甲基－1，3－环已二酮与苯基溴化镁反应可得1，4－加成产物．
With 2-dialkylthiomethylene-5,5-dimethyl-1,3-cyclohexanedione having different alkylthio groups and allyl, 2-methylallyl, phenylmagnesium halide Such as Grignard reagent reaction, the orientation of the addition reaction was initially investigated. Addition of 2-dialkylidenemethylene-5,5-dimethyl-l, 3-cyclohexanedione with allyl and 2-methylallyl results in a 1,2-addition product The reaction of 2-dimethylthiomethylene-5,5-dimethyl-1,3-cyclohexanedione with phenylmagnesium bromide gives the 1,4-addition product.