Dow Global Technolgoies LLC

Dow Agrosciences LLC

Ddp Specialty Electronic Materials Us, LLC

David Bruce Gorman

Daniel J Murray

John Wesley Hull, Jr

Ronald B Leng

Bruce A King

Michael Rack

Joachim Gebhardt

William Jack Kruper, Jr

Gary A Roth

Guido Mayer

Hagen Jaedicke

Norbert Götz

Ted A Morgan

William J Kruper

Christopher Thomas Hamilton

Douglas C Greminger

Michael Allen Gonzalez

Michael Gullo

Terry L Gehrman

Jr John Wesley Hull

Ted Andrew Morgan

Daniel Joseph Murray

Terry Lee Gerhman

Douglas Carl Greminger

Butadiene copolymers are brominated using certain quaternary ammonium or phosphonium tribromides as the brominating agent. The bromination is performed in solution in a mixture of n-butyl acetate and ethyl acetate. The bromination process proceeds easily under mild conditions, and produces a brominated product that has excellent thermal stability.

Process for brominating butadiene polymers using ester solvent mixtures

Unsaturated organic compounds are brominated with a quaternary ammonium tribromide or a quaternary phosphonium tribromide, especially when the bromination is conducted in a chlorinated solvent. A quaternary ammonium or quaternary phosphonium monobromide salt is produced in the reaction, together with some amount of quaternary ammonium or quaternary phosphonium monochloride salt. The monochloride salt is converted to the corresponding quaternary ammonium monobromide salt by reacting it with a source of bromide ions. The monobromide salt is then reacted with bromine to regenerate the quaternary ammonium or phosphonium tribromide, which is recycled into the bromination reaction. This process reduces the amount of chlorine that is incorporated into the brominated product.

Process for brominating unsaturated organic compounds with removal of quaternary ammonium or quaternary phosphonium monochlorides

Butadiene copolymers are brominated using certain quaternary ammonium tribromides as the brominating agent. The bromination process proceeds easily under mild conditions, and produces a brominated product that has excellent thermal stability.

Process for brominating butadieneninyl aromatic copolymers

Butadiene copolymers are brominated using certain quaternary ammonium tribromides as the brominating agent. The bromination process proceeds easily under mild conditions, and produces a brominated product that has excellent thermal stability. A quaternary ammonium monobromide salt is produced as a reaction by-product. A solvent for the monobromide salt is added to the reaction after 25-90% bromination of the aliphatic carbon-carbon double bonds. This provides for significantly shorter reaction times while providing a product with few impurities.

Process for brominating butadiene copolymers by the addition of water or certain solvents

Butadiene copolymers are brominated in solution using bromine as the brominating agent. The bromination is conducted in the presence of an excess of an aliphatic alcohol, relative to the amount of bromine that is used. The bromination proceeds rapidly at mild conditions, and is selective in that only aliphatic carbon-carbon double bonds are brominated, and unwanted bromination at tertiary carbon atoms is largely or completely avoided. The resulting brominated polymers are characterized in having very good thermal stability.

Process for brominating butadiene/vinyl aromatic copolymers

Brominated butadiene polymers are recovered from a bromination reaction solution by partially stripping the solvent to form a concentrated solution or slurry, and then recovering the brominated butadiene polymer from the concentrated solution or slurry. The process allows for a simplified, effective an economical recovery of the brominated butadiene polymer. Brominated butadiene polymers recovered in this manner are often very thermally stable.

Partial solvent stripping process for recovering brominated butadiene polymers from solution

4-Trifluoromethyl-2(1H)-pyridinone is prepared by reaction of 4-alkoxy-1,1,1-trifluorobut-3-en-2-one or 4,4-dialkoxy-1,1,1-trifluorobutan-2-one with a trialkyl phosphonoacetate followed by cyclization.

Process for the preparation of 4-trifluoromethyl-2(1H)-pyridinone

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