Dalton communication. Intramolecular nucleophilic addition of the oxygen of a nitro ligand onto the cis olefin in cationic complexes of platinum(II)

Abstract

Among cationic complexes of platinum(II), [Pt(olefin)(NO₂)(tmen)][ClO₄](olefin = ethane 1b, propene 2b, E-but-2-ene 3b, Z-but-2-ene 4b; tmen =N,N,N′,N′-tetramethylethylenediamine), complexes 2b and 3b have given evidence for the formation of an intramolecular metallacycle resulting from nucleophilic attack of one oxygen of then nitro ligand on the cis olefin which changes from an η²- to σ-co-ordination mode.