Selective Iodination of Alcohols with NaI/Amberlyst 15 in Acetonitrile

Abstract: A simple and effective procedure for conversion of primary, secondary, allylic and benzylic alcohols into the corresponding iodides is described using NaI/Amberlyst 15 in acetonitrile at room temperature. Selective conversion of benzylic alcohols in the presence of saturated alcohols into the corresponding benzylic iodides is achieved under these conditions

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

Natural phosphate-supported Cu(ii), an efficient and recyclable catalyst for the synthesis of xanthene and 1,4-disubstituted-1,2,3-triazole derivatives

Cu(NO 3 ) 2 supported on natural phosphate, Cu(ii)/NP, was prepared by co-precipitation and applied as a heterogeneous catalyst for synthesizing xanthenes (2-3 h, 85-97%) through Knoevenagel-Michael cascade reaction of aromatic aldehydes with 1,3-cyclic diketones in ethanol under refluxing conditions. It was further used for regioselective synthesis of 1,4-disubstituted-1,2,3-triazoles (1-25 min, 95-99%) via a three-component reaction between organic halides, aromatic alkynes and sodium azide in methanol at room temperature. The proposed catalyst, Cu(ii)/NP, was characterized using X-ray fluorescence, X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, Brunauer-Emmett-Teller, Barrett-Joyner-Halenda and inductively coupled plasma analyses. Compared to other reports in literature, the reactions took place through a simple co-precipitation, having short reaction time (85%), and high recyclability of catalyst (>5 times) without significant decrease in the inherent property and selectivity of catalyst. The proposed protocols provided significant economic and environmental advantages

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

Modified Methods for the Synthesis of Triazinyl Fluorescent Brightener Intermediates

Abstract: The production of triazinyl fluorescent brightener intermediates in high yields is described. The method involves a simplified work-up for the preparation of 4-nitrotoluene-2-sulfonic acid and the use of diethylene glycol instead of water in the preparation of 4,4&apos;-dinitrostilbene-2,2&apos;-disulfonic acid