Pavani M. Sreekanth

An efficient synthesis of 1,5-benzodiazepine derivatives catalyzed by a solid superacid sulfated zirconia

Abstract 2,3-Dihydro-1 H -1,5-benzodiazepines are synthesized by the condensation of o -phenylendiamine and various ketones in the presence of a versatile solid superacid catalyst ‘sulfated zirconia’ under solvent free conditions.

Facile Synthesis of 1,1‐Diacetates from Aldehydes Using Environmentally Benign Solid Acid Catalyst Under Solvent‐Free Conditions

Abstract Variety of aromatic and aliphatic aldehydes are converted into their 1,1‐diacetates in the presence of environmentally benign Mo/TiO2–ZrO2 solid acid catalyst in good to excellent yields under solvent‐free conditions.

AN EFFICIENT ZIRCONIA CATALYST FOR SOLVENT FREE TETRAHYDROPYRANYLATION OF ALCOHOLS AND PHENOLS

ABSTRACT Alcohols and phenols are tetrahydropyranylated in the presence of sulfated zirconia catalyst in good to excellent yields under solvent free conditions.

Alkali promoted rare earth metal phosphates for vapour phase O-alkylation of α- and β-naphthols with methanol

The vapor-phase catalytic O-alkylation of α- and β-naphthols with methanol has been investigated over lanthanum, cerium, samarium, and antimony phosphate catalysts promoted with cesium hydroxide. Among various catalysts investigated, the Cs-SmPO4 combination catalyst provided better catalytic activity and selectivity. The CsOH promoter suppressed formation of C-alkylated side products and enhanced the O-alkylation selectivity. Characterization of these catalysts by X-ray diffraction and FT-infrared techniques revealed that the cesium promoter has no influence on the bulk structure of the catalysts. Temperature programmed desorption of anhydrous ammonia over promoted and unpromoted catalysts revealed that the cesium promoter decreases total surface acidity of the catalysts.