Titanocene dithiolene complexes

Subsequent to the development of the titanocene dithiolenes, related results were obtained starting with ZnS,(tmeda), where tmeda = tetrameth-ylethylenediamine and ZnS4(pmdta) (189), where pmdta = pentamethyldieth-ylenetriamine (ligand). These species react with DMAD and HC2C02Me to give dithiolene complexes, and the dithiolene can also be readily removed from the zinc center. The zinc complexes are more potent dithiolene-transfer agents than the titanocene complexes. The pentacoordinate complex ZnS4(pmdta) reacts more rapidly with alkynes than the tmeda derivative (Fig. 17). 

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