Photochemical and thermal synthesis of metal carbonyl complexes of tetraalkyl diphosphine disulfides [M(CO)(4)(R(2)P(S)P(S)R(2)] M=Mo, W; R=Me, Et, Pr-n, Bu-n)

The new complexes [M(CO)(4)(R(2)P(S)P(S)R(2))], 1A-1D, 2A-2D, (1A,M = Mo, R = Me; 1B, M = Mo, R = Et; 1C, M = Mo, R = Pr-n; 1D, M = Mo, R = Bu-n; 2A, M = W, R = Me; 2B; M = W, R = Et; 2C, M = W, R = Pr-n; 2D, M = W, R = Bu-n) have been prepared either by the photochemical reaction of M(CO)(6) with R(2)P(S)P(S)R(2), or by thermal displacement of coordinated norbornadiene in C7H8Mo(CO)(4) with R(2)P(S)P(S)R(2), to give the complexes [M(CO)(4)(R(2)P(S)P(S)R(2))]. The complexes have been characterized by elemental analysis, IR and P-31-[H-1]-NMR spectroscopy and FAB-Mass spectrometry; the spectroscopic studies suggest a cis-chelate bidentate coordination of the ligand. Copyright (C) 1997 Elsevier Science Ltd.