... 1985, 4, 2102. 0276-1333/88/2307-0604$01.50/0 transition-metal carbene complexes have become in- creasingly important as reagents for organic synthesis or as precursors for new organometallic complexe ~ . ~ , ~ In ... Page 3. 606 Organometallics, Vol. 7, No. 3, 1988 ...