Intramolecular heterolytic dihydrogen cleavage by a bifunctional frustrated pyrazolylborane Lewis pair??

Chemical Communications Pub Date: 2010-10-18 DOI: 10.1039/C0CC03474F

Abstract

The reaction of bis(pentafluorophenyl)borane, HB(C6F5)2, with 3,5-di-tert-butyl-1H-pyrazole (3) affords the zwitterionic pyrazolium-borate trans-5 and, after dehydrogenation by use of the frustrated carbeneborane Lewis pair 1/B(C6F5)3, the bifunctional pyrazolylborane 6, which is able to cleave dihydrogen heterolytically with the formation of a mixture of cis-5 and trans-5.

Graphical abstract: Intramolecular heterolytic dihydrogen cleavage by a bifunctional frustrated pyrazolylborane Lewis pair
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