The complexes (Me,M'CH,),M*ZTHF (M = Sc The n.m.r. data are consistent with a trigonal bipyraniidal or Y ; M' = C or Si) and (o-MeOC,H,SiMe,CH,),Sc have arrangement of ligands around the metal, the THF molebeen isolated from the reaction of the appropriate cules occupying axial sites. The unusual five-co-ordination lithium reagent with MCI, or MC1;nTHF. may be favoured by the rather bulky Me,SiCH; ligands.
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