Council of Scientific and Industrial Research

General Electric Company

Bhalchandra Mahadeo Bhanage

Raghunath Vitthal Chaudhari

Raj Madhukar Deshpande

Sunil Sadashiv Divekar

Eric James Pressman

Swaminathan Sivaram

Ashutosh Anant Kelkar

Bahram Moasser

Chilukuri Ver Avadhani

Sunil Purushottam Gupte

Subbareddiar Kanagasabapathy

Mohammed Shadbar Qureshi

Polycarbonate oligomers are prepared by oxidative carbonylation of a dihydroxyaromatic compound such as bisphenol A in the presence of a catalyst comprising a Group VIII metal such as palladium, an inorganic and/or an organic co-catalyst, a halide source and an alcohol-free solvent comprising at least one liquid aromatic hydrocarbon, optionally in combination with a dipolar aprotic liquid such as N-methylpyrrolidinone. These oligomers may be further polymerized by melt polymerization to precursor polycarbonate oligomers which may be converted to high molecular weight polycarbonates by melt or solid state polymerization.

Method for preparing polycarbonates by oxidative carbonylation

A process for the hydrogenation of organic compounds using water soluble catalyst in a biphasic media by: (A) forming an organo-water dispersion of (i) an organic phase having (a) an organic compound and (b) an organic solvent, and (ii) an aqueous phase having a water soluble group VIII metal catalyst composition and a water soluble ligand; and (B) contacting said dispersion with hydrogen to provide an interfacial reaction between said organic compound and said hydrogen, giving significant enhancement in the rate of reaction to produce saturated organic compound as compared to a reaction carried out in the absence of said water immiscible ligand.

Process for the catalytic hydrogenation of organic compounds

A process is effected using water soluble metal complex catalysts in the presence of a promoter in the organic (water immiscible) phase. The process results in the enhancement of the rate of hydroformylation by interfacial catalysis induced by the presence of a ligand (promoter) in a catalyst immiscible phase. The reaction comprises of two phases viz - organic phase and aqueous phase. The organic phase consists of an olefin and P- containing water insoluble ligand with or without water immiscible solvent. The aqueous phase consists of a metal complex catalyst comprising of group VIII element such as Rh, Ru, Ir or Co and a water soluble ligand.

Process for the catalytic hydroformylation of alkenes

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Maharashtra, India

Bhalchandra Mahadeo Bhanage