Multiple metal-carbon bonds. 8. Preparation, characterization, and mechanism of formation of the tantalum and niobium neopentylidene complexes, M (CH2CMe3) 3 ( …

RR Schrock, JD Fellmann

Index: Schrock,R.R.; Fellmann,J.D. Journal of the American Chemical Society, 1978 , vol. 100, p. 3359 - 3370

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Citation Number: 313

Abstract

Abstract: The reaction between Ta (CHzCMe3) 3CI2 and 2 mol of LiCH2CMe3 in pentane gives thermally stable Ta (CHzCMe3) 3 (CHCMe3)(1) in quantitative yield. The rate- determining step is believed to be formation of thermally unstable Ta (CH2CMe3) 4CI (7)(which can be prepared from 1 and HCI at-78 “C). 7 reacts very rapidly with LiCH2CMe3 cornpared to the rate at which Ta (CHzCMe3) 3CIz reacts. In the absence of LiCH2CMe3 ...