Pentamethylcyclopentadienyl-dicarbollide derivatives of scandium
Abstract
The reactions of [Cp*ScCl_2]_x (Cp* = (η^5-C_5Me_5)) with Na_2[C_2B_9H_(11) or [Cp*ScMe_2]_x, with C_2B_9H_(13), followed by treatment with THF yield Cp*(C_2B_9H_(11))Sc(THF)_3. Alkylation of Cp*-(C_2 B_9 H_(11)) with LiCH(SiMe_3)_2 yields Cp(C_2B_9H_(11))ScCH(SiMe_3)_2Li(THF)_3, and {[Cp*(C_2B_9H_(11))ScCH(SiMe_3)_2]_2Li}-Li(THF)_3, which is obtained by its recrystallization from pentane/toluene, has been characterized structurally. This alkyl derivative reacts slowly with H_2 to yield [Cp*(C_2B_9H_(11))SCH]_2[LiTHF)_n]_2, a surprisingly reactive scandium hydride dimer. Once again, recrystallization from toluene affords a crystalline form with less coordinated THF, [Cp*(C_2B_9H_(11))ScH]_2[Li(THF)_2•(3/2)(C_6H_5CH_)3, whose structure reveals that the two anionic [Cp*(C_2B_9H_(11))ScH]^- fragments are held together by reciprocal B-H dative bonding from the dicarbollide ligand to the electron deficient scandium. The potential of pentamethylcyclopentadienyl-dicarbollide derivatives of scandium to serve as efficient a olefin polymerization catalysts is discussed.
Additional Information
© 1993 American Chemical Society. Received October 26, 1992. The work has been supported by the USDOE Office of Basic Energy Sciences (Grant No. DE-FG03-85ER113431) and by Exxon Chemicals Americas. G.B. acknowledges financial support as an NSERC Fellowship. We thank Professor Leslie Field for assistance in acquiring the ^(11)B NMR spectra.Attached Files
Supplemental Material - om00030a024_si_001.pdf
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Additional details
- Eprint ID
- 86501
- DOI
- 10.1021/om00030a024
- Resolver ID
- CaltechAUTHORS:20180521-113254660
- Department of Energy (DOE)
- DE-FG03-85ER113431
- Exxon Chemicals America
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Created
-
2018-05-21Created from EPrint's datestamp field
- Updated
-
2021-11-15Created from EPrint's last_modified field
- Other Numbering System Name
- Arnold and Mabel Beckman Laboratories of Chemical Synthesis
- Other Numbering System Identifier
- 8755