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Silylation as a protective method in acetylene chemistry. : Syntheses in the polyeneyne series,R3Si(CC)n(CHCH)4(CC)nSiR3 and H(CC)n(CHCH)4(CC)nH (n = 1, 2)
Authors:SJ Harris  DRM Walton
Institution:School of Molecular Sciences, University of Sussex, Brighton, East Sussex BN1 9QJ, England
Abstract:The Grignard reagents R3Si(CC)nMgBr (R = Me, n = 1; R = Et, n = 1,2) couple with cyclooctatetraene dibromide 1 in THF to give, as major products, the silyl-stabilised E, Z, Z, E-polyeneynes, Me3SiCC(CHCH)4CCSiMe33a, Et3SiCC(CHCH)4CCSiEt34a and Et3Si(CC)2(CHCH)4(CC)2SiEt36a together with minor proportions of configurational isomers Z, E, Z, Z 3c, all -E 3b, 4b, 6b and compounds in which a bicyclo-octadiene structure 2, 5 and 7 is retained. Irradiation converts the cis(Z)-rich isomers e.g. 3c into the all-trans(E) products. Treatment of the bissilyl compounds 3, 4 and 6 with aqueous base liberates the respective parent polyeneynes, H(CC)n(CHCH)4(CC)nH, in each case.
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