Preparation of (.eta.-C5H5)Ru(PPh3)(L)SR (R = 1-C3H7, CHMe2, 4-C6H4Me; L = PPh3, CO) and insertion of CS2 into the Ru-SR bond to give the thioxanthates (.eta.-C5H5)Ru(PPh3)S2CSR (R = 1-C3H7, CHMe2, 4-C6H4Me). Crystal structure of (.eta.-C5H5)Ru(PPh3)S2CS-1-C3H7