Cyclopentenes react with isocyanate on (Lig)Ni0-systems to form the bicyclic 5-azanickelacyclopentan-4-one derivates. The geometry of these butterfly complexes favors β-elimination of the β′-hydrogen atoms over that of the β- or β″-hydrogen. In a catalytic reaction the unsaturated amides 3-cyclopentene-carboxylic amide or 2-methylcyclopentene-3-carboxylic amide, both of which are substituted in position
环戊烯与(Lig)Ni 0-系统上的
异氰酸酯反应形成双环5-氮杂
镍-
环戊烷-4-一衍
生物。这些蝶形配合物的几何形状比β-或β''-氢的β-氢原子更倾向于β-消除。在催化反应中,以高选择性形成在3位被取代的不饱和酰胺3-
环戊烯-
羧酸酰胺或2-甲基
环戊烯-3-
羧酸酰胺。