Council of Scientific and Industrial Research

Central Salt and Marine Chemicals Research Institute

Ashutosh Vasant Bedekar

Ramachandraiah Gadde

Pushpito Kumar Ghosh

Gadde Ramachandraiah

Dipak Balvantrai Shukla

Adimurthy Subbarayappa

Kumar Pushpito Ghosh

Subbarayyappa Adimurthy

Pushhpito Ghosh

A cost-effective process is described for the preparation of a stable and non-hazardous brominating reagent containing 2:1 stoichiometric ratio of alkali bromide to alkali bromate. The process comprises of reacting alkaline bromine intermediate mixture, obtained from bromine recovery plant, with chlorine gas in the presence of a strong alkali to oxidize the bromide ions to bromate ions. This brominating reagent is useful for the bromination of aromatic compounds by substitutions.

Process for preparation of non-hazardous brominating agent

A new eco-friendly process is described in the present invention for the preparation of bromobenzene through substitution of one of the C&#x2014;H proton of benzene ring with a highly reactive hypobromous acid generated in situ, said process comprises the steps of activating a water soluble, easy to handle, brominating reagent with a mineral acid at elevated temperature and atmospheric pressure to generate active bromine species which in turn reacts with benzene.

Process for eco-friendly synthesis of bromobenzene

A highly pure 2,4,4,6-tetrabromo-2,5-cyclohexadienone has been prepared in a single pot, eco-friendly procedure in yields of 91-94% from phenol. In this method, a mixture of alkali/alkaline earth metal bromide and alkali/alkaline earth metal bromate was employed as brominating agent in place of corrosive liquid bromine. The reaction between phenol and the brominating reagent was initiated by the action of a mineral acid or moderately strong organic acid. The crude product was further characterized by standard analytical and spectroscopic methods.

Process for preparing 2,4,4,6-tetrabromo-2,5-cycloyhexadienone

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Gujarat, India

Ashutosh Vasant Bedekar