Synthesis, structure, dynamic properties, and indenyl transfer reactions of {AlMe2(THF) (indenyl)}2SiMe2

B. Thiyagarajan, Richard F. Jordan, Victor G. Young

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Abstract

The reaction of Li2SBI (SBI = Me2Si(1-indenyl)2) with 2 equiv of AlMe2Cl in Et2O, followed by treatment with THF, affords {AlMe2(THF)(indenyl)}2-SiMe2 (1), which is isolated as a ca. 1/1 mixture of rac and meso isomers, from which rac-1 is obtained by crystallization from toluene. An X-ray crystallographic analysis establishes that rac-1 exists as the 1,3 isomer, i.e., (1-{AlMe2(THF)-1-indenyl)}(3-{AlMe 2(THF)}-1-indenyl)SiMe2, in the solid state. NMR studies establish that in toluene-d8, rac-1 exists as a 2/1 mixture of 1,3 and 1,1 Al-indenyl isomers which interconvert rapidly on the NMR time scale at room temperature. Rac-1 undergoes slow isomerization to a 1/1 rac/meso mixture (3 days, 23°C, benzene) and also undergoes slow partial disproportionation by ligand redistribution (28% conversion, 2 days, 23°C, benzene). Compound 1 (1/1 to 1.4/1 rac/meso mixture) reacts with Zr(NMe2)4 and Hf(NMe2)4 under mild conditions to yield (SBI)Zr(NMe2)2 in >90% NMR yield (rac/meso = 4.5/1) and rac-(SBI)Hf(NMe2)2 in 61% isolated yield, respectively.

Original languageEnglish (US)
Pages (from-to)281-283
Number of pages3
JournalOrganometallics
Volume17
Issue number3
DOIs
StatePublished - Feb 2 1998

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