Double Phosphinoboration of CO2: A Facile Route to Diphospha‐Ureas
JHW LaFortune, ZW Qu, KL Bamford… - … A European Journal, 2019 - Wiley Online Library
Chemistry–A European Journal, 2019•Wiley Online Library
The reactions of CO2 with a series of phosphinoboranes, including R2PBpin (R= Ph, tBu;
pin= pinacol), R2PBMes2 (R= Ph, tBu; Mes= 2, 4, 6‐Me3‐C6H2), and R2PBcat (R= Ph, tBu,
Mes; cat= catechol) are described. Although R2PBpin and R2PBMes2 afford products of the
form R2PCO2Bpin (R= Ph 1, tBu 4) and R2PCO2BMes2 (R= Ph 2, tBu 3), respectively,
R2PBcat lead to further reaction affording the diphospha‐ureas,(R2P) 2CO (R= Ph 5, tBu 6,
Mes 7), together with O (Bcat) 2. Computational studies provide insight into the mechanism …
pin= pinacol), R2PBMes2 (R= Ph, tBu; Mes= 2, 4, 6‐Me3‐C6H2), and R2PBcat (R= Ph, tBu,
Mes; cat= catechol) are described. Although R2PBpin and R2PBMes2 afford products of the
form R2PCO2Bpin (R= Ph 1, tBu 4) and R2PCO2BMes2 (R= Ph 2, tBu 3), respectively,
R2PBcat lead to further reaction affording the diphospha‐ureas,(R2P) 2CO (R= Ph 5, tBu 6,
Mes 7), together with O (Bcat) 2. Computational studies provide insight into the mechanism …
Abstract
The reactions of CO2 with a series of phosphinoboranes, including R2PBpin (R=Ph, tBu; pin=pinacol), R2PBMes2 (R=Ph, tBu; Mes=2,4,6‐Me3‐C6H2), and R2PBcat (R=Ph, tBu, Mes; cat=catechol) are described. Although R2PBpin and R2PBMes2 afford products of the form R2PCO2Bpin (R=Ph 1, tBu 4) and R2PCO2BMes2 (R=Ph 2, tBu 3), respectively, R2PBcat lead to further reaction affording the diphospha‐ureas, (R2P)2CO (R=Ph 5, tBu 6, Mes 7), together with O(Bcat)2. Computational studies provide insight into the mechanism, revealing an intermediate derived from double phosphinoboration of CO2.
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