Eastman-kodak Company

Carl M Lentz

David Dunlap Cornell

James R Overton

Michael R Cushman

Bruce L Gustafson

Dale E Van Sickle

Joseph S Bowers, Jr

Paul S Wehner

Edward T Mullins

Charles L Gibson

Electrochemical process for preparing diaryliodonium salts using a single compartment and a carbon anode. The process has high current efficiency and, optionally, increased para, para' regioselectivity. The process proceeds in the presence of a solvent such as acetic acid and an electrolyte such as a compound of fluorine or sulfuric acid.

Electrochemical synthesis of diaryliodonium salts

Disclosed is an improved process for the preparation of haloaromatic amines by the catalytic hydrogenation of halonitroaromatic compounds in the presence of a chromium-containing Raney cobalt catalyst. The catalyst gives good hydrogenation rates while minimizing formation of dehalogenated by-products.

Hydrogenation of halonitroaromatic compounds

Process is disclosed for the preparation of phenylhydroquinones by the alkylation of hydroquinone (or derivatives thereof) with the cyclohexyl moieties, cyclohexanol or cyclohexene (or derivatives thereof), followed by dehydrogenation of the intermediate cyclohexylhydroquinone.

Synthesis of phenylhydroquinones

A method for selective dehydrogenation of a compound, comprising contacting a compound of the formula ##STR1## wherein each R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is independently selected from the group consisting of H, (C.sub.1 -C.sub.20) alkyl, (C.sub.3 -C.sub.20) cycloalkyl, (C.sub.6 -C.sub.20) aryl, (C.sub.7 -C.sub.20) alkylaryl, (C.sub.7 -C.sub.20) aralkyl groups, as well as substituted (C.sub.1 -C.sub.20) alkyl, (C.sub.3 -C.sub.20) cycloalkyl, (C.sub.6 -C.sub.20) aryl, (C.sub.7 -C.sub.20) aralkyl and (C.sub.7 -C.sub.20) arylalkyl moieties, optionally further substituted with --OR, wherein R is R.sup.1, R.sup.2, R.sup.3 or R.sup.4 ; and wherein R.sup.1 and R.sup.2 or R.sup.3 and R.sup.4 may be joined as part of a ring structure, at a dehydrogenation temperature in the presence of a catalyst comprising about 0.01 wt %-19.9 wt % Pd and about 0.01 wt %-19.9 wt % Cu on a carbon support, wherein the total amount of (Pd+Cu) on the support is about 0.02 wt % to 20 wt %, the weight ratio of Pd:Cu is about 1:1 to 10:1, and the carbon support has a surface area of at least about 100 m.sup.2 /g and is essentially free of reactive sulfur. A selective dehydrogenation catalyst having the composition described supra is disclosed as is a method of preparing the same. This catalyst is highly selective for dehydrogenating a variety of substrates while minimizing the formation of unwanted hydrogenolysis by-products.

Catalyst composition and method for selective dehydrogenation

An electrolytic method for the simultaneous preparation of a diaryliodonium salt and an alkoxide salt comprises adding to the anode compartment of an electrolytic cell, comprised of an anode, a first electrolytic solution comprising an aromatic compound, an iodoaromatic compound, a solvent and a first organic salt; adding to the cathode compartment of the cell, comprised of a cathode, a second electrolytic solution comprising a hydroxyalkyl compound and a second organic salt; and applying to the anode and the cathode an electric potential, to form diaryliodonium salt in the anode compartment and an alkoxide salt in the cathode compartment. Esters of an aromatic acid are prepared by carbonylating an admixture of the diaryliodonium salt and the alkoxide salt by the addition of carbon monoxide thereto.

Electrolytic method of simultaneously preparing diaryliodonium salt and

The present invention provides a process for the preparation of aromatic dicarboxylic acids by the carbonylation of aromatic diiodides. The aromatic diiodides are reacted with carbon monoxide in the presence of a soluble rhodium catalyst in a hydrocarbon acid reaction medium to prepare the aromatic dicarboxylic acids.

Carbonylation process for the production of aromatic dicarboxylic acids

The present invention provides a novel process for the preparation of styrene, stilbene, and/or substituted derivatives thereof. The process involves the reaction of an aryl sulfonyl chloride with an olefinic compound in the presence of a catalytic amount of a metal catalyst consisting essentially of palladium.

Preparation of styrene and stilbene compounds

The present invention provides a process for the preparation of aryl carboxylic acids and derivatives thereof by the carbonylation of diaryliodonium salts. The diaryliodonium salts are reacted with carbon monoxide and water or an alcohol or amine in a base reaction medium having a pK.sub.b greater than about 8.

Carbonylation process for the production of aromatic acids and

The present invention provides a process for the preparation of monoesters of dicarboxylic acids by the carbonylation of carboxyphenyl-triarylphosphonium salts. The carboxyphenyl-triarylphosphonium salts are reacted with carbon monoxide and an alcohol in a base reaction medium having a pK.sub.b greater than about 8.

Carbonylation process for the production of monoesters aromatic

The present invention provides a process for the preparation of aryl carboxylic acids by the carbonylation of diaryliodonium salts. The diaryliodonium salts are reacted with carbon monoxide in the presence of a zero-valent palladium in a hydrocarbon acid reaction medium to prepare the aromatic carboxylic acids.

Carbonylation process for the production of aromatic acids

The present invention provides a process for the preparation of aryl carboxylic acids and derivatives thereof by the carbonylation of aryl sulfonyl chlorides. The aryl sulfonyl chlorides are reacted with carbon monoxide and water or an alcohol or amine in the presence of a zero-valent metal catalyst consisting essentially of palladium.

The present invention provides a process for the preparation of aryl carboxylic acids and derivatives thereof by the carbonylation of triaryl sulfonium salts. The triaryl sulfonium salts are reacted with carbon monoxide and water or an alcohol or amine in the presence of a triaryl phosphine and a zero-valent metal catalyst selected from palladium or rhodium.

Growing community of inventors

Mt. Carmel, TN, United States of America

Carl M Lentz