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A magnetically separable catalyst consisting bipyridinium supported on silica coated Fe3O4 nanoparticles was prepared. Fe3O4@SiO2/bipyridinium nanocomposite (Fe3O4@SiO2/BiPy+22Cl–) was used as a recyclable heterogeneous catalyst for the synthesis of various multi-substituted imidazoles via multi-components cyclocondensation reaction of 1,2-dicarbonyl compounds, aldehydes and N-source compounds under solvent-free conditions. This catalyst afforded the imidazole derivatives as key intermediates in pharmaceutical chemistry in very short reaction times. The catalyst is readily recovered by simple magnetic decantation and can be recycled several times with no significant loss of catalytic activity. However, this catalyst was characterized by FT-IR, TGA, SEM and VSM. [ABSTRACT FROM AUTHOR]

A variety of symmetrical dialkyl disulfides were prepared from the reaction of alkyl halides, sodium hydroxide and elemental sulfur under solvent free conditions. The reaction proceeded very fast and produced the desired products in moderate to excellent isolated yields. [ABSTRACT FROM AUTHOR]

A new facile and efficient one-pot method for the synthesis of ethers by the reaction of alcohols with calcium peroxodisulfate under microwave irradiation is described. [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]

A simple and efficient method for the conversion of various oxiranes to the corresponding thiiranes using thiourea under solvent free conditions is described. [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]

A convenient and efficient synthesis of vicinal azidohydrin has been achieved by ring opening of epoxides using SiO 2 /NaN 3 under solvent free conditions. The reaction is highly regioselective and afforded the corresponding products in good to excellent yields under mild and neutral reaction conditions. [ABSTRACT FROM AUTHOR]