Title compds. I (R = Me, CMe:CH2) were prepd. by reaction of Me2SiClCR:CEtBEtCl with Li2S, Na2S, or (Me3Si)2S. Complexes of I with AlCl3, Lewis bases (e.g., g-picoline N-oxide), and transition metal compds. (e.g., Cr and Fe carbonyls) were prepd. and their structures examd. Sandwich complexes were obtained from I and (cyclododecatriene)nickel, and one was subjected to x-ray anal. Reactions of I with MeOH, AcOH, and acetylacetone were studied, the last resulting in S/O exchange.