ORGANOMETALLIC COMPOUNDS OF THE LANTHANIDES .115. DONOR SUBSTITUTED CHIRAL ANSA-LANTHANIDOCENES - SYNTHESIS OF YCLOPENTADIENYL)(TETRAMETHYLCYCLOPENTADIENL)SILANE DIPOTASSIUM AND OF SOME CHIRAL ANSA-METALLOCENEDERIVATIVES OF Y, SM, HO, ER AND LU

Reaction of Me2SiCl2 with [C5HMe4]Na in tetrahydrofuran (THF) followed by treatment with [C5H4CH2CH2NMe2]Na gives Me2Si(C5HMe4)(C5H4CH2CH2NM e2), which reacts with KH to yield the dipotassium salt K-2[Me2Si(C5Me 4)(C5H3CH2CH2NMe2)] (1). The reaction of YCl3(THF)(3) and the lanthani de trichlorides LnCl(3)(THF)(n) (Ln = Sm, Ho, Er, Lu) with 1 in THF re sults in the yttrium complex and the lanthanide complexes [Me2Si(C5Me4 )(C5H3CH2CH2NMe2)]LnCl [Ln = Y (2), Sm (3), Ho (4), Er (5), Lu (6)]. T he complexes 2, 4 and 6 react with Li[CH3] in ether to yield the chira l monomethyl compounds [Me2Si(C5Me4)(C5H3CH2CH2NMe2)]LnMe [Ln = Y (7), Ho (8), Lu (9)]. The new complexes were characterized by elemental an alysis, MS and NMR spectroscopy as well as 2 and 9 by single crystal X -ray structure analysis. (C) 1997 Elsevier Science S.A.