Tropylium-Catalyzed O–H Insertion Reactions of Diazoalkanes with Carboxylic Acids
作者:Claire Empel、Thanh Vinh Nguyen、Rene M. Koenigs
DOI:10.1021/acs.orglett.0c04069
日期:2021.1.15
describe the application of a nonbenzenoid aromatic carbocation, namely tropylium, as an organic Lewis acid catalyst in O–H functionalization reactions of diazoalkanes with benzoic acids. The newly developed protocol is applicable to a wide range of diazoalkane and carboxylic acid substrates with excellent efficiency (43 examples, up to 99% yield).
Photochemical Reactions of Alkyl Phenylglyoxylates<sup>1</sup>
作者:Shengkui Hu、Douglas C. Neckers
DOI:10.1021/jo960685e
日期:1996.1.1
isolated and identified in the reactions of ethyl phenylglyoxylate (1a) in benzene. Quantum yields and initial rate constants of product formation are shown to be concentration dependent. For the formation of carbonyl product 3 at lower starting material concentrations (<0.01 M), quantum yields greater than 1 are observed. Variations in the quantum yields as a function of reaction time are due to the accumulation