Abstract
The photochemistry of potassium triphenyl(phenylethynyl) borate, tetramethylammonium triphenyl(trans-β-styryl) borate, and cesium phenyl(2-phenylcyclopropyl)dimethylborate was studied. When irradiated with UV light, these compounds undergo rearrangements to generate potassium 1,1,2,3-tetraphenylboratirene, tetramethylammonium trans-1,1,2,3-tetraphenylboratirane, and (unisolated) cesium 1,1-dimethyl-2,4-diphenylboratetane, respectively. The mechanism of these reactions appears to be similar to the di-π-methane and cyclopropyl-π-methane routes for the analogous hydrocarbons. The effect of borate structure on the efficiency of these reactions was analyzed. Additionally, the chemical and physical properties of the small-ring borates were probed
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