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countable and uncountable, plural borinenes
(organic chemistry) An alkene that includes a benzene ring with one of the carbon atoms replaced by a boron atom. quotations examples
With di-tert-butylacetylene the actual borinene is isolated in conjunction with the corresponding 1,3-diboretene.
2007, E. W. Abel, F. G. A. Stone, Organometallic Chemistry, volume 14, page 29
Thus, at 135°C, 223 cyclizes with loss of propene to the borinene 229, which then rearranges to other products.
2012, Donald S. Matteson, Stereodirected Synthesis with Organoboranes, page 96