Reactions of co-ordinated ligands. Part 15. The cycloaddition of electronegatively substituted unsaturated systems to tricarbonyl(η-N-methoxycarbonyl-1H-azepine)-iron and -ruthenium and tricarbonyl(η-cyclohepta-2,4,6-trien-1-one)iron
作者:Michael Green、Susan M. Heathcock、Terence W. Turney、D. Michael P. Mingos
DOI:10.1039/dt9770000204
日期:——
Hexafluoroacetone, tetracyanoethylene, and 1,1 dicyano-2,2-bis(trifluoromethyl)ethyiene form exo-1,3 adducts with tricarbonyl(η-cyclohepta-2,4,6-trien-1-one)iron and tricarbonyl(η-N-methoxycarbonyl-1H-azepine)-iron and -ruthenium. A 1,6 adduct is also obtained with the azepineiron system. Deuteriation experiments show that the unco-ordinated double bond is the initial site of electrophilic attack.
六氟丙酮,四氰基乙烯和1,1二氰基-2,2-双(三氟甲基)乙炔与三羰基(η-环庚-2,4,6-三烯-1-酮)铁和三羰基(η )形成exo -1,3加合物- ñ甲氧基羰基-1- ħ吖庚因) -铁和钌。用氮杂铁体系也可得到1,6加合物。氘化实验表明,未配位的双键是亲电子攻击的起始位点。环庚三烯酮铁络合物的1,3-四氰基乙烯加合物在溶液中容易异构化为1,5-加合物。严格评估了这些环加成反应的公认偶极机理,并提出了另一种协调一致的反应路径。