Abstract: The invention provides a green process for direct oxidation of a large number of substituted or unsubstituted cinnamaldehydes or cinnamyl alcohols into the corresponding alkyl or aryl cinnamates in one step. The process of the present invention is a convenient and efficient green process for the preparation of various aryl or alkyl cinnamates under conventional, microwave and ultrasound directly from cinnamaldehydes or cinnamyl alcohols in the presence of an oxidizing agent, catalyst and an alcohol, with or without an organic solvent. These esters are immensely important compounds in flavor, perfumery and pharmaceutical industries. There are several prior arts available for the preparation of cinnamic esters, but all of them suffer from deficiencies such as use of expensive reagents and catalysts, harsh reaction conditions, use of toxic chemicals and others.

Abstract: The invention entitled “A Microwave Induced One Pot Process for The Preparation of Arylethenes” provides a method for the preparation of commercially important 2- or 4-hydroxy substituted arylethenes like styrenes or stilbenes in one pot utilizing cheaper substrates in the form of 2- or 4-hydroxy substituted cinnamic acids and their derivatives as well as reagents in the form of base such as sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium bicarbonate, sodium carbonate, potassium bicarbonate, potassium carbonate, ammonium acetate, imidazole, methylimidazole and the combination thereof, with or without solvent such as dimethylformamide, dimethylsulfoxide, ethylene glycol, diethylene glycol, acetonitrile, acetone, methyl imidazoles, ionic liquid, water and the like. The reaction time vary from 1 min-12 hrs and yield of the products from 49-76% depending upon the base, acid, substrate source of heating monomode or multimode microwave or conventional.

Abstract: The present invention relates to a single step, microwave induced process for the preparation of substituted stilbenes and its analogs. Particularly, provides a method for the preparation of commercially important 2- or 4-hydroxy substituted stilbenes in one pot utilizing cheaper substrates in the form of 2- or 4-hydroxy substituted arylaldehyde and/or phenylacetic acids as well as regents in the form of base such as collidine, triethylamine, pyridine, piperidine, sodium acetate, ammonium acetate, imidazole, methyl imidazoles and the like and/or acid such as formic acid, acetic acid, propionic acid and the like for a reaction time varying from 1 min-16 hrs depending upon microwave or conventional heating, without using decarboxylating agents with yield varying from 37-66% depending upon the base and/or acid, solvent and substrate used.