Transition metal complexes of the dipyrromethylidene (dipyrrol-2-ylmethylene) ligand, LnM[C(C4H4N)2], from reaction between ruthenium- and osmium-bound dichlorocarbene and pyrrole: structures of [RuCl2{CCl(C4H4N)}(CO)(PPh3)2] and [RuCl{C(C4H3N)(C4H4N)}(CO)(PPh3)2]

Abstract

[MCl₂(CCl₂)(CO)L₂](M = Ru or Os: L = PPh₃) with pyrrole forms sequentially [MCl₂{CCl(C₄H₄N)}(CO)L₂] and [[graphic omitted])(C₄H₄N)}(CO)L₂]; the latter is protonated by HCl to the dipyrromethylidene complex [MCl₂{C(C₄H₄N)₂}(CO)L₂].