Silica Supported Acids (HClO4-SiO2, KHSO4-SiO2) as Eco-friendly Reusable Catalysts for Bromodecarboxylation of α,β-Unsaturated Carboxylic Acids using KBr under Solvothermal and Solvent-Free Conditions

Vijay Shekar Pulusu1,, Chinna Rajanna Kamatala1,*,, Umesh Kumar Utkoor1,, Maasi Reddy Nagannagari1,, Hemanth Sriram Yelike1,, Samba Shiva Rao Arisha2, and Yaku Gugulothu1,

1Department of Chemistry, Osmania University, Hyderabad-500007, India

2Department of Chemistry, Maturi Venkata Subba Rao Engineering College, Nadergul, Hyderabad-501510, India

*Corresponding author: E-mail: kcrajannaou@yahoo.com

Abstract

A mild procedure has been developed for the bromodecarboxylation of α,β-carboxylic acids using nano silica supported SiO2-HClO4, SiO2-KHSO4 as catalysts and KBr as a bromine source in conventional solvothermal, ultrasonic assisted and solvent-free microwave assisted conditions. The α,β-unsaturated cinnamic acids were converted to corresponding β-bromo styrenes with high regioselectivity, while aliphatic α,β-unsaturated carboxylic acids afforded related β-bromo alkenes.

Keywords

HClO4-SiO2, KHSO4-SiO2, Bromo decarboxylation,α,β-Unsaturated carboxylic acids.

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