Syntheses and Structure of 8-, 7-, and 6-Membered Silacycloallenes

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Date
1993-03-01
Authors
Pang, Yi
Petrich, Scott
Young, Victor
Gordon, Mark
Barton, Thomas
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Ames Laboratory
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Chemistry
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Abstract

Decreasing the ring size of a cyclic allene to rings of fewer than 10 carbons results in deviation of both the normal C=C=C linearity and the orthogonality of the dihedral angle.' To date, the smallest isolable cycloallene is 1-tert-butyl-1,2-cyclooctadiene,2 and the smallest for which structural information is available is the phenylurethane derivative of cyclonona-2,3-dien-1-oJ,l which is bent to 168° and twisted to a dihedral angle of 79.8°. Encouraged by our recent success in the synthesis and structure determination of a tetrasilacyclohexyne,4 we have pursued the syntheses of strained silacycloallenes and report herein the first examples of isolable 6- and ?-membered rings containing 1,2-diene units.

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Reprinted (adapted) with permission from Journal of the American Chemical Society 115 (1993): 2534, doi:10.1021/ja00059a073. Copyright 1993 American Chemical Society.

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