Nama Narender

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

N-Alkylation of amines with alcohols over nanosized zeolite beta

Direct N-alkylation of amines with alcohols was successfully performed by using nanosized zeolite beta, which showed the highest catalytic activity among other conventional zeolites. This method has several advantages, such as eco-friendliness, moderate to high yields, and simple work-up procedure. The catalyst was successfully recovered and reused without significant loss of activity and only water is produced as co-product. In addition, imines were also efficiently prepared from the tandem reactions of amines with 2-, 3- and 4-nitrobenzyl alcohols using nanosized zeolite beta.

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.

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.

Synthesis of N-heterocyclic compounds over zeolite molecular sieve catalysts: an approach towards green chemistry

The need for environmentally benign reactions is very important in view of todays eco-friendly conscious attitude. “Benign by Design” represents the 12 principles of Green Chemistry as articulated by John Warner and Paul Anastas (Green Chemistry: Theory and Practice, Oxford University Press, New York, 1998, p. 30) These principles have given chemists a framework for the evaluation of the chemical procedures and help chemists to develop synthetic procedures which are more efficient, create less waste, use and produce less toxic substances. Many chemists already considered some of these principles without giving much attention. The difference between traditional chemistry and green chemistry is that the green chemistry demands issues of sustainability and environmental impact; in essence we design chemicals that are inherently more benign. In recent years, the use of solid acid catalysts such as zeolites and zeotype molecular sieve (D. W. Breck, Zeolite Molecular Sieves, Wiley, New York, 1974; A. Dyer, An Introduction to Zeolite Molecular Sieves, John Wiley & Sons, Chichester, 1988) catalysts in the manufacture of fine chemicals, chemical intermediates, drugs and drug intermediates has attracted increasing interest as green catalysts. Owing to the special features of zeolites such as shape selectivity, thermal stability, controlled variability, reusability and eco-friendly nature, these catalysts are most sought after in green chemistry. This perspective particularly illustrates the application of zeolites and zeotype catalysts for the synthesis of various N-heterocyclic compounds. For proposed reaction mechanisms see ESI.

Fast and efficient synthesis of ZSM-5 under high pressure

Abstract Highly crystalline ZSM-5 catalysts were synthesized in 4–6 h of autoclavation time using various solvents under high pressures (∼40–60 atm ) and temperatures (230–250 °C)

Regioselective oxyiodination of aromatic compounds using potassium iodide and oxone

ABSTRACT A highly efficient, simple, mild and regioselective method for oxyiodination of aromatic compounds is reported. The electrophilic substitution of iodine generated in situ from KI as an iodine source and oxone® as an oxidant for the first time. *IICT Communication No. 4786