Conclusions
Reaction of bis(α,2-dihydroxybenzyl)phenylphosphine and its derivatives with the isobutyl ester of diphenylboric acid, the anhydride of phenylboric acid, and boric acid in the presence of amines forms ammonium 2,8,9-trioxa-1-borata-4-phospha-6,7-benzobicyclo[3.3.1] non-6-enes. Reaction with 2 equivalents of the isobutyl ester of diphenylboric acid gives bis(triethylammonium 2,2-diphenyl-5,6-benzo-1,3,2-dioxaborin-4-yl)phenylphosphine oxide.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 946–951, April, 1989.
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Nikonov, G.N., Karasik, A.A., Erastov, O.A. et al. Synthesis of P, B-containing heterocycles based on bis(α,2-dihydroxybenzyl)phenylphosphine. Russ Chem Bull 38, 853–857 (1989). https://doi.org/10.1007/BF00953306
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DOI: https://doi.org/10.1007/BF00953306