Bis(trimethylsilyl)benzamidinate: a promising spectator ligand in organoyttrium chemistry. Synthesis and reactivity of {[C6H5C(NSiMe3)2]2Y-.mu.-R}2 (R = H, C.tplbond.CH) and x-ray structure of {[C6H5C(NSiMe3)2]2Y-.mu.-C.tplbond.CH}2

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