Synthesis of asymmetric beta-hydroxy-cyclopentadienyl ligands and of theirbidentate lanthanide complexes

The synthesis of novel asymmetric beta-hydroxy-cyclopentadienyl ligands C5H 5CH2CH(R-1)OH (R-1 = Me, CH2OMe, Ph), obtained by the nucleophilic ring ope ning reaction of enantiopure epoxides by cyclopentadienyl anion is describe d. The metallation of these ligands by sodium or potassium metals or by but yl lithium leads to the formation of bis alkaline metals derivatives [C5H4C H2CH(R-1)O]M-2 (M = Li, Na, K). Complexes (S)-C5H4CH2CH(Me)OLaI(THF)(2) and (S)-C5H4CH2CH(Me)OSmI(THF) are synthesized from the bis potassium salt and lanthanum or samarium iodides in good yields. (C) 1999 Elsevier Science S. A. All rights reserved.