4-Methyl-N-[(E)-4-methyl-1-(4-methyl­phenyl­sulfon­yl)-1,2-dihydropyridin-2-yl­idene]benzene­sulfonamide

The reaction of 2-(amino­meth­yl)pyridine and 4-toluene­sulfonyl chloride in CH2Cl2 at pH 8 led to the title compound, C20H20N2O4S2. The aromatic rings are almost perpendicular to each other and the dihedral angles between the aromatic ring planes are 74.33 (9) (central pyridine versus benzene ring of the tosyl group bonded to the imine functionality), 73.77 (6) (pyridine versus benzene ring of the tosyl group bonded to pyridinic N atom) and 79.83 (9)° (benzene rings of tosyl groups). In the crystal structure, inter­molecular aromatic π–π stacking inter­actions [centroid–centroid separation = 3.6274 (14) Å] help to consolidate the packing

An efficient Knoevenagel condensation using HZSM-5 zeolite as a catalyst

857-858<span style="font-size:12.0pt;font-family: " times="" new="" roman";mso-fareast-font-family:"times="" roman";mso-ansi-language:="" en-in;mso-fareast-language:en-in;mso-bidi-language:ar-sa"="" lang="EN-IN">Knoevenagel condensation is assisted by HZSM-5 zeolite wherein various aromatic aldehydes react readily with malononitrile and ethyl cyanoacetate to produce corresponding olefinic products.</span

HZSM-5-zeolite as remarkable and reusable catalyst for the direct acetylation of alcohols and phenols under solvent-free conditions

859-860<span style="font-size:12.0pt;font-family: " times="" new="" roman";mso-fareast-font-family:"times="" roman";mso-ansi-language:="" en-in;mso-fareast-language:en-in;mso-bidi-language:ar-sa"="" lang="EN-IN">HZSM-5 zeolite catalyze the acetylation or alcohols and phenols with acetic anhydride under solventless system. The catalyst can be recycled with no activity loss.</span

Ammonium chlorochromate adsorbed on alumina for cleavage of semicarbazones and phenylhydrazones under classical heating and microwave irradiation in solvent-free system

Ammonium chlorochromate supported onto alumina efficiently regenerates carbonyl compounds from their corresponding semicarbazones and phenylhydrazones under classical heating in non-aqueous conditions and microwave irradiation in solvent-free system

Solid-state induced heterocyclization under microwave irradiation: Synthesis of 2-phenyl-3-hydroxy-quinolin-4(1<i>H</i>)-one

779-781Synthesis of 2-phenyl-3-hydroxy-quinolin-4(1H)-one under microwave irradiation in solventless system has been described. The mechanism of the reaction is also discussed