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Chiral metallocene complexes with a dialkylphosphonium bridge and different main-group metal (Li, K, Ba) centers have been synthesized from phosphonium-bridged bis(cyclopentadienyl) ligands in their mono- and diprotonated forms. NMR studies in solution and crystal structures of the kalocene Me 2 P(2-Me-4- t Bu-C 5 H 2 ) 2 K and of the barocene Me 2 P(2-Me-4- t Bu-C 5 H 2 ) 2 Ba(THF) 3 + BPh 4 - show that these metallocenes are obtained in form of their racemic diastereomers.
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Leyser et al. (1998) studied this question.
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