Organonitrogen groups in metal carbonyl complexes. Part VIII. Diaza-allyl derivatives of manganese

Abstract

Lithioamidines,R′N(Li)·C(R):NR′, react with [Mn(CO)₅X](X = Cl, Br, or I) to yield carbamoyl-type complexes, [Mn(CO)₄{CO·N(R′)·C(R):NR′}], which, in contrast to previously reported carbamoyl complexes, can be decar-bonylated by u.v. irradiation to form [Mn(CO)₄{R′N·C(R):NR′}] complexes. Various bonding modes are discussed for each organonitrogen group, and structures are suggested on the basis of limited spectroscopic data. Thermolysis of [Mn(CO)₄{CO·N(Ph)·C(Ph):NPh}] also caused decarbonylation of the carbamoyl group, but when achieved under a high pressure of carbon monoxide the first example of an amino-manganese carbonyl complex, [Mn(CO)₅{N(Ph)·C(Ph):NPh}], was also formed.