Thiometalate ligands metal complexes

RS-M" L c-i)- The other is the oxidative addition of thiols to low-valent transition metals (M"L ) to give the corresponding transition metal complexes bearing both hydride and thiolate ligands (RS-M" L c 2-H). The reaction of the former complexes (RS-M" L c-i) with carbon-carbon unsaturated compounds such as alkynes may proceed via thiometallation, in which relatively more bulky is bonded at the terminal carbon of alkynes. On the other hand, in the reaction of the latter complexes (RS-M" L c-2 H) with alkynes both hydrometallation and thiometallation processes are possible. These processes proceed via sy -addition. Alternative pathway for the addition of thiols to alkynes involves coordination of alkynes to transition metals and then nucleophilic addition of thiols (or thiolate anions) to the alkynes. These processes take place via a f -addition. By controlling these pathways, regio- and stereoselective hydrothiolation of alkynes is expected to be attained successfully. 

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