摘要:
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 Me2P(B-Me-4-tBu-C5H2)(2)K and of the barocene Me2P(2-Me-4-tBuC(5)H(2))(2)Ba(THF)(3)+BPh4- show that these metallocenes are obtained in form of their racemic diastereomers.