Hydroboration of Carbon Dioxide Using Ambiphilic Phosphine–Borane Catalysts: On the Role of the Formaldehyde Adduct
摘要:
Ambiphilic phosphine borane derivatives 1-B(OR)(2)-2-PR'(2) C6H4 (R' = Ph (1), iPr (2); (OR)(2) = (OMe)(2) (1a, 2a); catechol (1b, 2h) pinacol (1c, 2c), OCH2C-(CH3)(2)CH2O- (1d)) were tested as catalysts for the hydroboration of CO2 using HBcat or BH3 center dot SMe2 to generate methoxyboranes. It was shown that the most active species were the catechol derivatives 1b and 2b. In the presence of HBcat, without CO2, arnbiphilic species 1a, 1c, and 1d were shown to transform to 1b, whereas 2a and 2c were shown to transform to 2b. The formaldehyde adducts 1b-CH2O and 2b. CH2O are postulated to be the active catalysts in the reduction of CO2 rather than being simple resting states. Isotope labeling experiments and density functional theory (DFT) studies show that once the formaldehyde adduct is generated, the CH2O moiety remains on the ambiphilic system through catalysis. Species 2b center dot CH2O was shown to exhibit turnover frequencies for the CO2 reduction using BH3 center dot SMe2 up to 228 h' at ambient temperature and up to 873 h(-1) at 70 degrees C, mirroring the catalytic activity of 1b.
Trapping of Difluorocarbene by Frustrated Lewis Pairs
作者:Vladimir O. Smirnov、Alexander D. Volodin、Alexander A. Korlyukov、Alexander D. Dilman
DOI:10.1002/anie.202001354
日期:2020.7.20
FrustratedLewispairs consisting of diphenylphosphino and boryl groups located at the ortho‐position can trap difluorocarbene affording stable zwitterionic adducts. The reaction can be reversed to release difluorocarbene at elevated temperatures.
Singletdioxygen is readily split by phosphine–boronates under mild conditions. The initially formed phosphine peroxides spontaneously rearrange by B→O migration. The resulting peroxoboronates have been structurally characterized, and their ability to undergo oxygen transferreactions substantiated.