Directed Reduction of Six-Membered Nitrogen Heterocycles-Selective Formation of Polynuclear Titanium Complexes

摘要

Low-valent titanium compounds of the bent metallocene type have proven to be excellent templates for the linkage of π-bonding systems (A→B). This is illustrated by the formation of titanacyclopentanes, -pentenes, -pentadienes, -oxacyclopentenes or -dioxacyclopentanes in the early days of organometallic chemistry.