Double insertion Of CS2 into two Ru-H bonds of [(dPPM)(2)Ru(H)(2)] (dppm = Ph2PCH2PPh2) affords the methanedithiolate complex [(dPPm)(2)Ru(eta(2)-S2CH2)]. The methanedithiolate moiety has been functionalized using 2 equiv of RX resulting in bis(alkylthio)methane derivatives [(dppm)(2)Ru(RSCH2SR)][X](2). The bis(alkylthio) methane complex loses the bis(alkylthio)methane moiety under very mild conditions and in turn affords the [(dppm)(2)RuX2] complex from which the starting dihydride [(dppm)(2)Ru(H)(2)] has been regenerated via reaction with KOH/EtOH. On the other hand, insertion of CS2 into one Ru-H bond of [(dppe)(2)Ru(H)(2)] (dppe = Ph2PCH2CH2PPh2) followed by functionalization using RX results in alkyl dithioformate complex trans-[(dPPe)(2)Ru(H)(SC(SR)H)][X]. In this case also, the alkyl dithioformate moiety gets eliminated under very mild conditions to afford the [(dppe)2Ru(H)(X)l derivative from which the starting clihydricle has been regenerated via reaction with NaBH4. The reactions presented here constitute utilization Of CS2 as a C-1 synthetic source for the generation of useful organic compounds.