Treatment of a purple-black solution of SmCp*2(THF)2 in toluene with an equimolar amount of 1a or 1b resulted in the formation of (anti--O-1a)SmCp*2 and (anti--O-1b)SmCp*2 (3a and 3b). Paramagnetic green solids of 3a and 3b were obtained in 72% and 90% isolated yield, respectively (Figure ). Again, the presence of the unreacted carbene carbon atom was unambiguously confirmed using SC-XRD analysis (see Figure for 3a; Figure for 3b.