Formation of Novel Tetradentate Phosphine Ligand o-C6H4(PPhCH2CH2PPh2)2 by Coupling of Two Diphosphine Ligands Bound to Low-Valent Mo or W Center. Synthesis and Structure of [M{o-C6H4(PPhCH2CH2PPh2)2}(Ph2PCH2CH2PPh2)] (M = Mo, W)

Abstract

Abstract A mixture of trans-[M(N2)2(dppe)2] (M = Mo or W; dppe = Ph2PCH2CH2PPh2) and dppe was heated to reflux in benzene or toluene to give the M(0) complex [M(P4)(dppe)], which contains the novel tetradentate phosphine o-C6H4(PPhCH2CH2PPhg2)2 (P4) arising from the coupling of two dppe ligands. The reaction of [Mo(P4)(dppe)] with CO afforded the carbonyl complex [Mo(CO)2(P4)].