Potassium hydrogen sulfate (KHSO 4) mediated oxidation of certain alcohols (Polyols) has been studied by quinolinium bound Cr(VI) reagents like quinolinium dichromate (QDC) and quinolinium chlorochromate (QCC) at different temperatures. Reaction kinetics revealed second order kinetics with a first order in [Alcohol] and [Cr(VI) reagent] at constant bisulfate concentration. Ten fold variation of added [KHSO 4 ] enhanced the observed rateconstant (k′) by ten fold, showing first order dependence on [KHSO 4 ]. Most plausible mechanisms for QDC oxidation and QCC oxidation of polyols are proposed on the basis of observed kinetic features.

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Silica supported nanogreenacids like Si-KHSO4, and Si-HClO4are explored as reusable catalysts for bromination of aromatic and hetero aromatic compounds using KBr under solvothermal, and solvent-free conditions. Reaction times reduced from Reacions under conventional solvothermal protocols conditions required (4 – 6) hours, while ultrasonic assisted reactions only (9 – 12) minutes for completion. But, solvent-free microwave assisted reactions required only (1-5) minutes exhibiting striking rate acceleration compared to the solvothermal and ultrasonic assisted protocols All the reaction protocols afforded fairly good yields of brominated products, which are comparable with existing protocols.

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