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First Unambiguous Characterization of a Novel RO-BH2 Intermediate by 1H{11B} and 1H{13C,11B} NMR Spectroscopy. Proof of Boron−Carbonyl Interaction through Innovative Use of NMR Techniques

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posted on 2008-05-26, 00:00 authored by Shahid Islam, Syarhabil Ahmad, Tina Liu, F. Holger Försterling, M. Mahmun Hossain
An unusual reduction of the aryl-substituted 3-hydroxyacrylic acid ester 1 by BH3 results in the propenoic acid ethyl ester 3. We were able to prove the presence of an intermediate 2 containing a cyclic O-BH2 ← OC< moiety in 2 by using 1H−11B and 1H−13C{11B} NMR correlation experiments.

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