E.i. Dupont De Nemours and Company

William A Nugent, Jr

Ronald James McKinney

Albert Loren Casalnuovo

Jerald Feldman

Francis Joseph Waller

Lawrence W Gosser

Thaliyil V Rajanbabu

William Thomas Hall

A process for the preparation of N-substituted dehydroamino acid esters by contacting a .beta.-hydroxy-.alpha.-amino acid ester or N- or O-substituted .beta.-hydroxy-.alpha.-amino acid ester with an excess of acetic anhydride and a base is disclosed.

Process for the efficient preparation of N-substituted dehydroamino acid

A process for the preparation of optically active cycloolefins based upon reaction of optically active dienes in the presence of catalyst compositions comprising molybdenum and tungsten complexes.

Process for the preparation of optically active cycloolefins

Optically active Lewis acid catalysts of the early transition metals which are useful in the catalysis of asymmetric additions have been prepared. The catalyst complexes comprise an alkoxide of a group IV or group V metal and an optically active trialkanolamine or dialkanolamine ligand.

Enantioselective lewis acid catalysts of the early transition metals

Optionally active Lewis acid catalysts of the early transition metals which are useful in the catalysis of asymmetric additions have been prepared. The catalyst complexes comprise an alkoxide of a group IV or group V metal and an optically active trialkanolamine or dialkanolamine ligand.

The invention provides a process for enantioselective hydrocyanation of aromatic vinyl compounds which produces nonracemic mixtures of chiral, arylpropionitriles; novel carbohydrate phosphorus and nickel catalyst compositions; and optically pure (S)-(-)-2-(6-metehoxy-2-naphthalene)propionitrile.

Enantioselective hydrocyanation of aromatic vinyl compounds

This invention relates to a process for alkylation at carbon and phosphorus sites in an aqueous medium using precious metal catalysts containing sulfonated triarylphosphines (STP) of the generic formula P(C.sub.6 H.sub.4 SO.sub.3 --)X(C.sub.6 H.sub.5)Y (X+Y=3).

Aqueous alkylation process

Zerovalent nickel catalyzed hydrocyanation of mononitriloolefins e.g., 4-pentenenitrile, to dinitriles, e.g., adiponitrile, is improved by using a triorganotin compound as a promoter for the zerovalent nickel.

Triorganotin catalyst promoters for hydrocyanation

A process for producing a cyclopropane derivative comprising contacting a diazo compound and an olefinically unsaturated compound in the presence of a catalytic amount of copper cation-exchanged perfluorinated ion exchange polymer is disclosed.

Cyclopropanation process

Catalytic process for dimerizing a lower alkyl acrylate or methacrylate by contacting, at about 0.degree. to about 150.degree. C., the acrylate or methacrylate with the catalyst of the formula (RCN).sub.4 PdX.sub.2 wherein R is hydrocarbyl which contains no carbon-carbon unsaturation other than aromatic unsaturation and X is an anion which is incapable of displacing RCN from the cationic moiety of the palladium complex.

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Wilmington, DE, United States of America

William A Nugent, Jr