Organometallics p. 814 - 820 (2010)
Update date:2022-09-26
Topics:
Leung, Wing-Por
Wan, Chi-Ling
Kan, Kwok-Wai
Mak, Thomas C. W.
Bis(thiophosphinoyl)methane, CH2(PPh2=S)2, and its monolithium salt [Li{(S=PPh2)2CH}-(THF)(Et 2O)] (1) have been used to prepare a series of low-valent group 14 metal complexes. The reaction of lithium salt [Li{(S=PPh2) 2CH}(THF)(Et2O)] (1) with 1 equiv of MCl2 (M = Ge, Sn) in diethyl ether afforded monomeric organometal(II) chlorides [MCl{CH(PPh2=S)2}] (M = Ge (2), Sn (3)). Treatment of CH2(PPh2=S)2 with equimolar M(N(SiMe 3)2}2 (M = Sn, Pb) afforded 1,3-dimetallacyclobutanes [M(μ2-C(Ph2P=S) 2}]2 (M = Sn (4), Pb (5)), which are believed to be formed by the dimerization of the metallavinylidene intermediate. Compounds 2 and 5 further reacted with elemental chalcogens (S and Se) to give trans-dithiadigermetane [GeCl(CH(PPh2=S)2}(μ-S)] 2 (6) and lead(II) chalcogenates [PbE{C(PPh2=S) 2}] (E = S (7), Se (8)), respectively. Compounds 2-8 have been determined by X-ray crystallography.
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