synthesized with one-pot procedure from α,β-unsaturated thione (chromothione) derivatives by dimethyloxosulfonium methylide. Extremely facile addition of tetracyanoethylene with 4-methylene-4H-homochromenes gave dihydrobenzoxazepine derivatives. The reaction may be well interpreted with the homoaromatic stabilization of the cationic part in a zwitterionic intermediate which would be formed at the rate-determining
乙烯基环丙烷衍
生物可以由α,β-不饱和
硫酮(色
硫酮)衍
生物通过二甲基氧锍甲基化物通过一锅法合成。
四氰基乙烯与 4-亚甲基-4H-高色烯的极易加成得到二氢苯并恶氮衍
生物。该反应可以很好地解释为阳离子部分在两性离子中间体中的均芳香族稳定化,该中间体将在定速步骤中形成。