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
Irradiations of alkyl phenylglyoxylates with sulfur-containing carboxylates yielded the corresponding photodecarboxylative addition products in moderate to good yields of 26-58%. Reductive photodimerization competed with decarboxylative addition in all cases. The reaction protocol was successfully transferred to a microreactor. With potassium 2-(methylsulfanyl)propionate, photoadditions gave diastereomeric
A new transient stabilization effect (TSE) of CO2 is identified and applied to the electrochemical hydrogenation of azo compounds and the reductive coupling of α-ketoesters. The TSE influence of CO2 means that overactive intermediates can be captured by CO2 to prevent their decomposition or side reaction to complete the synthesis that is difficult to achieve by direct means. The CO2 can be released
确定了 CO 2的新瞬态稳定效应 (TSE),并将其应用于偶氮化合物的电化学氢化和 α-酮酯的还原偶联。CO 2的TSE影响意味着过度活跃的中间体可以被CO 2捕获以防止其分解或副反应以完成难以通过直接方式实现的合成。CO 2可以稍后通过脱羧过程释放。