Abstract

MINDO/3 calculations indicate the 1,2-didehydrocyclooctatetraene ( 2 ) and 1,2,5,6-tetradehydrocyclooctatetraene ( 10 ) and their benzo derivatives have planar skeletons. In addition, in the cases of 2 and its benzo derivatives, the acetylenic structure is found to be thermodynamically more stable than the cumulenic one.

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