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Organometallic compounds of the lanthanides . CXXI. Donor-substituted lanthanidocenes. Synthesis of mixed unbridged lanthanidocene chloride and alkyl derivatives

Stepwise reaction of ScCl 3(THF) 3 and the lanthanide trichlorides LnCl 3(THF) n (Ln=Nd, Sm, Ho, Lu) first with (dimethylaminoethyl)cyclopentadienyl potassium (KCp Do) and then with tetramethylcyclopentadienyl sodium (NaCp* H) or with pentamethylcyclopentadienyl sodium (NaCp*), respectively, yields...

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Published in:Journal of organometallic chemistry 1998-07, Vol.562 (2), p.255-262
Main Authors: Schumann, Herbert, Erbstein, Frank, Herrmann, Katja, Demtschuk, Jörg, Weimann, Roman
Format: Article
Language:English
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Summary:Stepwise reaction of ScCl 3(THF) 3 and the lanthanide trichlorides LnCl 3(THF) n (Ln=Nd, Sm, Ho, Lu) first with (dimethylaminoethyl)cyclopentadienyl potassium (KCp Do) and then with tetramethylcyclopentadienyl sodium (NaCp* H) or with pentamethylcyclopentadienyl sodium (NaCp*), respectively, yields the mixed sandwich complexes Cp DoCp* HScCl ( 1), Cp DoCp* HLnCl {Ln=Nd ( 2), Sm ( 3), Ho ( 4), Lu ( 5)} and Cp DoCp*LuCl ( 6), respectively. Treatment of 1– 5 with methyl lithium in Et 2O afforded the chiral alkyl derivatives Cp DoCp* HScMe ( 7) and Cp DoCp* HLnMe {Ln=Nd ( 8), Sm ( 9), Ho ( 10), Lu ( 11)}, respectively. Reaction of 6 with LiCH 2SiMe 3 yields the corresponding alkyl derivative Cp DoCp*LuCH 2SiMe 3 ( 12). The new complexes were characterized by elemental analysis, MS and NMR spectroscopy, as well as by single crystal X-ray structure analysis ( 1 and 7).
ISSN:0022-328X
1872-8561
DOI:10.1016/S0022-328X(98)00541-5