described. The barriers to rotation of the naphthyl groups were probed by MM2 and by dynamic 1H-NMR spectroscopy. An achiral syn and a chiral anti conformation were experimentally observed at −90°C for the free ligands and at −40°C for the complexes. The experimental ΔG≠ and the calculated ΔH≠ values are in fair agreement. The barriers are substantially higher in the alkali metalcomplexes than in the
Manganese-Catalyzed Reformation of Vicinal Glycols to α-Hydroxy Carboxylic Acids with the Liberation of Hydrogen Gas
作者:Satyadeep Waiba、Mamata Maiti、Biplab Maji
DOI:10.1021/acscatal.1c05844
日期:2022.4.1
glycols, to value-added α-hydroxycarboxylic acid molecules that are prevalent in bioactive molecules and biodegradable polymers. A bench stable Earth-abundant metal complex, [HN(C2H4PPh2)2]Mn(CO)2Br}, Mn-I catalyzed the reformation reaction at low temperature in high selectivity with a turnover number reaching 2400, surpassing previously used homogeneous catalysts for such a reaction. Hydrogen gas