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Basic alumina is employed as an inorganic basic solid catalyst for the clean and less hazardous protection of carbonyl compounds, such as phenylhydrazones, 2,4-dinitrophenylhydrazones, semicarbazones, and thiosemicarbazones, under solvent-free conditions. The reactions proceed smoothly and require a short reaction time with good to excellent yields, and the alumina used can be recycled. [ABSTRACT FROM AUTHOR]

The one-pot conversion of[3pc] primary and secondary alcohols into oximes is reported using chromium trioxide supported on alumina and hydroxylamine hydrochloride under solvent free condition. This oxidation-oxime formation reaction has been applied to a range of aliphatic and benzylic alcohols. [ABSTRACT FROM AUTHOR]

Sodium sulfide hydrate has been employed for an efficient reduction of a variety of azides to the primary amines in good-to-excellent yields under solvent-free system and without perturbing many active functionalities such as ether, carbonyl, sulfonyl, and nitro. [ABSTRACT FROM AUTHOR]

The efficient condensation of carbonyl compounds with hydroxylamine hydrochloride under solvent free conditions is described. [ABSTRACT FROM AUTHOR]

H2SO4 mixed with silica gel (1:1) by weight produces a white powder which is an effective catalyst for the conversion of carbonyl compounds to their corresponding phenyihydrazones and 2,4-dintrophenyihydrazones under solvent-free conditions. [ABSTRACT FROM AUTHOR]

Alcohols are rapidly oxidized to carbonyl compounds using Cr03 supported onto CuSO4 under solvent free conditions. Over-oxidation of aldehydes to carboxylic acids and damage to carbon-carbon double bond is not observed by this method. [ABSTRACT FROM AUTHOR]