Articles written in Journal of Chemical Sciences
Volume 121 Issue 2 March 2009 pp 177-182 Full Papers
A novel, practical and environmentally benign approach has been developed for the oxidation of methylarenes using H2O2-HBr system in water. Arylaldehydes containing electon-withdrawing groups are isolated in good to high yields. Methylarenes containing electon-donating groups, in contrast, are transformed into bromo-substituted arylaldehyde undergoing a tandem oxidation-bromination process.
Volume 133 All articles Published: 7 April 2021 Article ID 0038
In this study, the viability of a wide range of crystalline aromatic and aliphatic carboxylic acids asorganocatalysts has been investigated for solvent-free Paal–Knorr pyrrole synthesis under microwave activation.Among these potential catalysts, crystalline salicylic acid proved to be a remarkable catalyst becauseits efficiency remained high even under low microwave power irradiation or a shorter reaction time for themodel reaction. The outstanding catalytic activity of salicylic acid allowed the Paal–Knorr cyclocondensationwith a turnover frequency up to 1472 h-1 which is unique in the context of a metal-free homogeneouscatalysis. The attractive feature of this organocatalyst is its assistance in ultrafast pyrrole synthesis with norisk of metal contamination.
Synopsis: A green and expeditious protocol for the synthesis of 2,5-dimethylpyrroles via combination of salicylic acid as catalyst (in its solid state) and microwaves has been introduced.
Volume 133, 2021
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