S. J. Kulkarni

Zeolite-catalyzed cyclocondensation reaction for the selective synthesis of 3,4-dihydropyrimidin-2(1H)-ones

A zeolite catalyzed, single step and environmentally friendly process for the synthesis of dihydropyrimidinones, a pharmacologically important class of compounds, is reported. Reusability of the catalyst and the ease of separation of pure product, selectively and in high yields in comparison to the classical Biginelli reaction, are a few of the unique features of this process.

Liquid phase bromination of phenols using potassium bromide and hydrogen peroxide over zeolites

An efficient, simple, mild and regioselective method for oxybromination of phenols catalyzed by CrZSM-5(30) is reported. The electrophilic substitution of bromine generated in situ from KBr as a bromine source and hydrogen peroxide as an oxidant.

Zeolite catalyzed acylation of alcohols and amines with acetic acid under microwave irradiation

Zeolite Hβ is found to be an efficient catalyst for the acylation of alcohols and amines with acetic acid under microwave irradiation. The process is environmentally safe and heterogeneous with excellent yields.

AN EFFICIENT AND REGIOSELECTIVE OXYBROMINATION OF AROMATIC COMPOUNDS USING POTASSIUM BROMIDE AND OXONE

ABSTRACT A simple, efficient and regioselective method for oxybromination of aromatics is reported. The electrophilic substitution of bromine generated in situ from potassium bromide using oxone® as an oxidant for the first time. *IICT Communication No. 4708

HIGHLY EFFICIENT, PARA-SELECTIVE OXYCHLORINATION OF AROMATIC COMPOUNDS USING POTASSIUM CHLORIDE AND OXONE*

ABSTRACT A highly efficient, regioselective method for oxychlorination of aromatic compounds is possible through electrophilic substitution of chlorine generated in situ from KCl as a chlorine source and Oxone® as an oxidant for the first time. *HCT Communication No. 4580.

Isopropylation of naphthalene over modified HMCM-41, HY and SAPO-5 catalysts1

The alkylation of naphthalene with isopropanol was carried out over modified MCM-41, HY and SAPO-5 catalysts. The catalysts were characterized by XRD, IR, sorption techniques and temperature programmed desorption of ammonia. The yields of 2-isopropylnaphthalene were 32.1, 47.2 and 52.6 wt.% at 74.7, 55.9 and 81.0% conversion over HMCM-41, CeMCM-41 and LaKY, respectively. The yields of 2,6-diisopropyl naphthalene were in the range of 8 to 35.3%.

Novel Bromination Method for Anilines and Anisoles Using NH4Br/H2O2 in CH3COOH

Abstract A simple, efficient, regioselective, environmentally safe, and economical method for the oxybromination of anilines and anisoles without catalyst is reported. The electrophilic substitution of bromine generated in situ from ammonium bromide as a bromine source and hydrogen peroxide as an oxidant for the first time. #IICT Communication No. 01/X/07.

Liquid phase acylation of amines with acetic acid over HY zeolite

Alkyl, aryl and heterocyclic amines are efficiently converted to the corresponding amides with acetic acid over HY zeolite; the catalyst can be re-used with no loss of activity.

Oxidation and ammoxidation of toluene and benzyl alcohol over silico-aluminophosphate and metal-silico-aluminophosphate catalysts

Abstract The silico-aluminophosphate (SAPO), vanadium-aluminophosphate (VAPO) and vanadium-silico-aluminophosphate (VSAPO) catalysts were synthesized by hydrothermal method. Depending on silicon and vanadium content, the as-synthesized molecular sieves were thermally stable or unstable up to 400–450°C. The catalysts were characterized by XRD, IR, TG and sorption methods. The oxidation and ammoxidation reactions of toluene and benzylalcohol were carried out over SAPO, VAPO and VSAPO catalysts. The catalysts were selective in the oxidation and ammoxidation of toluene. The yield of benzonitrile was 20–92 wt.-%. The vanadium and Sb 2 O 3 modification enhances the yield of benzonitrile substantially. The benzoic acid was not observed in the products. In the ammoxidation of benzylalcohol, the yield of benzonitrile was 18%–74%. The selectivity of benzonitrile was comparatively lower. The reaction scheme is discussed. We report silico-aluminophosphate, VSAPO and TiSAPO, as-synthesized molecular sieves, as a new and novel class of oxidation and ammoxidation catalysts.

An improved acylation of phenol over modified ZSM-5 catalysts

The acylation of phenol with acetic anhydride was carried out over different modified ZSM-5 catalysts. Co, Cu, and Ce showed a promoting effect. The best temperature and weight hourly space velocity for this reaction were found to be 250°C and 0.5 h−1, respectively. ZSM-5(30) was found to be a better catalyst than ZSM-5(150) and ZSM-5(250) in the acylation of phenol. A plausible reaction mechanism is also discussed.