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Updated: Apr 14, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
Published on: November 22, 2016
Direct synthesis of a geminal zwitterionic phosphonium/hydridoborate system--developing an alternative tool for
Jiangang Yu1, Gerald Kehr, Constantin G Daniliuc
1Organisch-Chemisches Institut der Universität Münster Correnstraβe 40, 48149 Münster, Germany. erker@uni-muenster.de.
Abstract:
A convenient way to a new class of geminal Mes2PH(+)/B(C6F5)2H(-) pairs is presented. It utilizes triflic acid addition to trans-Mes2PCH=CHB(C6F5)2 followed by triflate/hydride exchange. Thermally induced ring-closure gave a phosphonium/boratacyclopropane zwitterion 8 which formed the Mes2PH(CHMe)B(C6F5)2H P/B FLP-H2 product 10 by subsequent treatment with triflic acid and a silane, or alternatively with dihydrogen at 90 °C. The product 10 is an active catalyst for the hydrogenation of a variety of unsaturated organic substrates, including a quinoline derivative. Treatment of compound 8 with HB(C6F5)2 gave a bifunctional borane 14 which selectively reduced carbon monoxide to the formyl stage.
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