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51.
A rapid process for decarboxylative bromination of α,β-unsaturated carboxylic acids have been developed using N,N-dibromo-p-toluenesulfonamide (TsNBr2). Treatment of cinnamic acids with TsNBr2 in presence of potassium carbonate in acetonitrile produces corresponding β-bromostyrenes at room temperature. Exclusive formation of (E)-β-bromostyrenes was observed in a stereoselective manner within a very short period of time (5–15?min). This method was further extended for obtaining 1-bromoalkynes from corresponding propiolic acids. Instantaneous formation of bromoalkynes was observed when the reaction was carried out in presence of DBU as a base in acetonitrile at room temperature. A wide variety of cinnamic acids and propiolic acids could be converted to corresponding β-bromostyrenes and 1-bromoalkynes respectively under mild reaction condition with high to excellent yield. 相似文献
52.
Hazarika Jenasree Talukdar Anusuya Rajaraman Prasanna Venkatesh 《Journal of Solid State Electrochemistry》2023,27(4):895-909
Journal of Solid State Electrochemistry - The anodic dissolution of Cobalt in H2O2 solution is investigated in the presence and absence of a complexing agent, oxalic acid, using various techniques... 相似文献