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RCSO)] and that [Pt0(PPh3)2[(Z)-(MeS)RCSO]] likewise gave rise to cis-(E)-[Pt"(MeS)(PPh,),(RCSO)] illustrate that during the oxidative-addition reaction isomerization of the sulfine skeleton occurs. Three types of isomerization pathway are possible: First, there could be an equilibrium between the pseudoallylic intermediates, analogous to the syn-anti interchange found in the complexes [P~CI(PR,)(V~-H,CC(H)CH~)].~~ Second, a direct equilibrium between the two oxidativeaddition stereoisomers &-(E)-and cis-(Z)-[Pt"(MeS)-(PPh,),(RCSO)] can be envisaged, perhaps catalyzed by trace impurities. Isomerization under influence of base has been observed for free sulfines.40A third possibility could be a process involving an impurity-catalyzed isomerization of free sulfine (generated by a dissociative process of the coordination compounds) followed by recoordination of the sulfine.In order to gain more insight into the isomerization of oxidative-addition stereoisomers, we have studied the isomerization of cis-( E )and cis-(Z) -[ Pt "C1( PPh,) 2( RSCSO)] (R = p-MeC6H4, Ph), oxidative-addition products of the sulfine (E)-(RS)ClCSO. The lability of the C-C1 bond with respect toward oxidative addition to PtO should prohibit both a reductive coupling reaction of C1 and RSC=S=O and the existence of pseudoallylic intermediates. The results will be described in a forthcoming paper.34 In order to investigate (39) Vrieze, K. "Dynamic Nuclear Magnetic Resonance Spectroscopy"; Jackman, L. M., Cotton, F. A., Eds.; Academic Press: New York, 1975; (40) Bonini, B. F.; Maccagnani, G . J. Chem. SOC., Perkin Tram. 2 1978, pp 441-487. 121 8-1 224.

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Aus der Reaktion von Co‐chlorid mit den Liganden (Ia) und (Ib) wurden von den möglichen Isomeren die Komplexe (II) und (III) bzw. (IV)‐(VI) erhalten.

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