First Unambiguous Characterization of a Novel RO-BH<sub>2</sub> Intermediate by <sup>1</sup>H{<sup>11</sup>B} and <sup>1</sup>H{<sup>13</sup>C,<sup>11</sup>B} NMR Spectroscopy. Proof of Boron−Carbonyl Interaction through Innovative Use of NMR Techniques Shahid Islam Syarhabil Ahmad Tina Liu F. Holger Försterling M. Mahmun Hossain 10.1021/om800137q.s001 https://acs.figshare.com/articles/journal_contribution/First_Unambiguous_Characterization_of_a_Novel_RO_BH_sub_2_sub_Intermediate_by_sup_1_sup_H_sup_11_sup_B_and_sup_1_sup_H_sup_13_sup_C_sup_11_sup_B_NMR_Spectroscopy_Proof_of_Boron_Carbonyl_Interaction_through_Innovative_Use_of_NMR_Techniques/2937391 An unusual reduction of the aryl-substituted 3-hydroxyacrylic acid ester <b>1</b> by BH<sub>3</sub> results in the propenoic acid ethyl ester <b>3</b>. We were able to prove the presence of an intermediate <b>2</b> containing a cyclic O-BH<sub>2</sub> ← OC< moiety in <b>2</b> by using <sup>1</sup>H−<sup>11</sup>B and <sup>1</sup>H−<sup>13</sup>C{<sup>11</sup>B} NMR correlation experiments. 2008-05-26 00:00:00 NMR TechniquesAn propenoic acid ethyl ester 3. First Unambiguous Characterization BH 3 results