Pentamethylcyclopentadienyl-dicarbollide derivatives of scandium

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Organometallics; (United States)

DOI:https://doi.org/10.1021/om00030a024· OSTI ID:6297763

Bazan, G C; Schaefer, W P; Bercaw, J E ^[1]

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1. California Inst. of Technology, Pasadena (United States)

The reactions of [Cp*ScCl[sub 2]][sub x] (Cp* = ([eta][sup 5]-C[sub 5]Me[sub 5])) with Na[sub 2][C[sub 2]B[sub 9]H[sub 11]] or [Cp*ScMe[sub 2]][sub x] with C[sub 2]B[sub 9]H[sub 13], followed by treatment with THF yield Cp*(C[sub 2]B[sub 9]H[sub 11])Sc(THF)[sub 3]. Alkylation of Cp*(C[sub 2]B[sub 9]H[sub 11])Sc(THF)[sub 3] with LiCH(SiMe[sub 3])[sub 2] yields Cp*(C[sub 2]B[sub 9]H[sub 11])ScCH(SiMe[sub 3])[sub 2]Li(THF)[sub 3], and [C[Cp*(C[sub 2]B[sub 9]H[sub 11])ScCH(SiMe[sub 3])[sub 2]][sub 2]Li] - Li(THF)[sub 3], which is obtained by its recrystallization from pentane/toluene, has been characterized structurally. This alkyl derivative reacts slowly with H[sub 2] to yield [Cp*(C[sub 2]B[sub 9]H[sub 11])ScH][sub 2][Li(THF)[sub n]][sub 2], a surprisingly unreactive scandium hydride dimer. Once again, recrystallization from toluene affords a crystalline form with less coordinated THF, [Cp*(C[sub 2]B[sub 9]H[sub 11])ScH][sub 2]Li(THF)[sub 2][center dot] 3/2(C[sub 6]H[sub 5]CH[sub 3]), whose structure reveals that the two anionic [Cp*(C[sub 2]B[sub 9]H[sub 11])ScH][sup [minus]] 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 [alpha] olefin polymerization catalysts is discussed. 16 refs., 2 fig., 2 tabs.

• OSTI ID: 6297763
• Journal Information: Organometallics; (United States), Journal Name: Organometallics; (United States) Vol. 12:6; ISSN 0276-7333; ISSN ORGND7
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
CATALYSTS
CHEMICAL REACTIONS
COHERENT SCATTERING
COMPLEXES
DATA
DIFFRACTION
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN
INFORMATION
LIGANDS
LITHIUM COMPLEXES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
POLYMERIZATION
RECRYSTALLIZATION
SCANDIUM COMPLEXES
SCATTERING
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
X-RAY DIFFRACTION