The first stable CH,-bridged transition metal complex was prepared by Herrmann et al. in 1975.") Since then, numerous pal kylidene complexes have been reported."] "Herrmann (1.6 M, 0.125 mol) was added at room temperature to a THF suspension (300 mL) of 1 a (20.0 g, 0.031 mol). An orange solution, containing some insoluble white solid formed, and then CIPPh, (22.8 mL. 0.125 mol) was added, keeping thc suspension at O.'C. The resulting light-brown solution was heated at 60 C for 2 h. The solvent was evaporated and the residuedissolved in toluene
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