Abstract
The reaction of diphenylphosphine with o-hydroxy aromatic aldehydes and a diphenylboric acid ester in the presence of tertiary amines gave ammonium 5,6-benzo-and 5,6-naphtho-4-diphenylphosphoryl-2,2-diphenyl-1, 3-dioxa-2-boratacyclohexanes. The borylation of (α,2-dihydroxybenzyl)diphenylphosphine, generated in situ, with isobutyl phenylborate gave 5,6-benzo-4-diphenylphosphino-2-phenyl-1,3-dioxa-2-boracyclohexane, which, in contrast to 1,3,2,5-dioxa-boraphosphorinanes, has a high reactivity with respect to electrophilic and nucleophilic reagents and adds oxygen, sulfur, selenium, and pyridine to give the corresponding derivatives.
Published Version
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