Council of Scientific and Industrial Research

Suman Kumar Jana

Vasant Ramchandra Choudhary

B-Phani Kiran

Nilesh Sudhir Patil

Kshudiram Mantri

Vasant Ram Chandra Choudhary

Process for the preparation of substituted aromatic compound employing friedel-crafts reaction using a reusable basic anionic clay catalyst

Process for preparation of substituted aromatic compound employing friedel-crafts reaction using a reusable basic anionic clay catalyst

The present invention provides a liquid phase process for the acylation of aromatic compound by an acylating agent of the formula (R R R )&mdash;Y&mdash;Z to obtain the corresponding acylated compound using a solid catalyst comprising a metal oxide of the formula AO with or without a catalyst support, wherein A is a metallic element selected from Ga, In, Ti, Fe and a mixture of two or more thereof, and x is the number of oxygen atoms required to fulfil the valance requirement of A, wherein the catalyst is pretreated with a dry gas comprising a hydrogen halide in the presence or absence of the aromatic compound to be acylated, contacting the hydrogen halide pretreated catalyst with a liquid reaction mixture comprising the aromatic compound and the acylating agent, cooling the reaction mixture, removing the catalyst from the reaction mixture and then separating the reaction products from the reaction mixture.

Process for the liquid phase acylation of aromatic compounds

Process for the acylation of aromatic compounds using a reusable solid catalyst comprising indium halide

This invention provides a process for the selective esterfication of a tertiary alcohol(I) by an acid anhydride(II) to produce corresponding tertiary ester(III) and carboxylic acid(V), using a reusable solid catalyst(IV) comprising one or more halides of indium, gallium, zinc and iron. The process comprises: (i) contacting a mixture of (I) and (II) in the absence or presence of a non aqueous solvent with the fine particles of (IV) in a stirred batch reactor provided with a reflux water condenser at atmospheric pressure at the reaction conditions, such that the mole ratio of (II) to (I) is in the range from about 0.1 to about 10.0; the weight ratio of (IV) to (I&plus;II) is in the range from about 0.005 to about 0.5; the reaction temperature is below about 80&deg; C., and the reaction period is in the range from about 0.1 h to about 50 h; (ii) removing the solid catalyst(IV) from the reaction mixture by filtration; and (iii) reusing the separated solid catalyst for subsequent batch of the process.

Process for the selective esterification of tertiary alcohol by an acid anhydride using a reusable solid catalyst

The invention relates to a process for the preparation of aralkylated aromatic compound with both small and large size aralkylating agents; wherein the catalyst used is heterogeneous solid catalyst removable from the reaction products by simple filtration, thus allowing the separated catalyst to be reused in the process. The catalyst is selected from micro or mesoporous gallosilicates and galloaluminosilicates, having structure similar to that of zeolites known in the prior art.

Process for the preparation of aralkylated aromatic compounds using heterogeneous catalyst

A supported catalyst and a process for the preparation of the catalyst, the catalyst containing mixed metal oxides or halides deposited on porous catalyst carriers or supports, useful for heterogeneously or solid catalyzed Friedel-Crafts reactions such as alkylation, aralkylation, acylation, or aroylation of aromatic compounds in the preparation of fine chemicals. The supported catalyst has high activity for the Friedel-Crafts reactions when the aromatic ring activating groups are present in the aromatic ring to be aralkylated, acylated or aroylated, and also when the ring activating group is absent or when aromatic ring deactivating groups are present in the aromatic ring to aralkylated, acylated or aroylated, so that the reaction temperature is low and/or the time for completing the reaction is short. The catalyst can be separated and used repeatedly for catalytic reactions.

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Maharashtra, India

Suman Kumar Jana