Journal of Organometallic Chemistry p. 175 - 196 (1989)
Update date:2022-08-11
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Auner, N.
Vi2SiCl2 (3) reacts with LiBut to give 1-vinyl-1-chloro-2-neopentylsilaethene (2), which in the absence of suitable partners cyclodimerizes to 1,3-divinyl-1,3-dichloro-2,4-dineopentyl-1,3-disilacyclobutane (6).With C5H6, C5Me5H or anthracene 2 is trapped by formation of the <2+4> cycloadducts, which in a similar reaction with LiBut yield the "norbornene-, pentamethylnorbornene"- and"dibenzo-2-silabicyclooctanesilaethenes" (30, 35 and 36) respectively.These undergo reactions with dienes affording <2+2> and/or <2+4> cycloadducts.The observed products and their distribution are best explained by assuming the silaethenes 30, 35 and 36, respectively together with their α-lithio precursors as reactive intermediates.Probably because of steric hindrance 30 and 36 do not dimerize to 1,3-disilacyclobutane derivatives.
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