Cyclooctatetraene complexes of yttrium and the lanthanides with chiral andachiral aminotroponiminates

The combination of dilithium- 1,4-bis(trimethylsilyl)cyclooctatetraene Li-2 (1,4-(Me3Si)(2)C8H6). with anhydrous yttrium or lutetium trichloride and po tassium N-isopropyl-2-(isopropylamino)troponiminate K{('Pr)(2)ATT}. leads t o the corresponding mono cyclooctatetraene complexes [{eta (8)-1,4-(Me3Si)( 2)C8H6} Ln{('Pr)(2)ATI}(THF)] (Ln = Y (1a), Lu (1b)). The solid-state struc ture of 1a was established by single-crystal X-ray diffraction. Using the s ame synthetic strategy, the chiral complex [{eta (8)-1,4-(Me3Si)(2)C8H6)Y { ((S)-PhCHCH3)(2)ATI} (THF)] (2) can be obtained by using the enantiomerical ly pure ligand, potassium N-(S)-1-phenylethyl-2-((S)-1-phenylethylamino)tro poniminate, K{(S)-PhCHCH3)(2)ATI. Furthermore, [(eta (8)-C8H8)Sm {('Pr)(2)A TI}-(THF)] (3) was obtained by the reaction of {(C8H8)SmI(THF)] and K{('Pr) (2)ATI). (C) 2001 Elsevier Science B.V. All rights reserved.