The Dow Chemical Company

Nobuyuki Ishibe

Charles W Martin

Tien K Tran

Warren F Richey

Alvetta Pryor

Bobby R Ezzell

Emmett L Tasset

Milton S Wing

Kevin P Darst

Thomas G Metcalf

Jimmie K Harden

Jimmie K Harden Nee Ashley

Renard L Thomas

Process for preparing a 2,3-dihaloperfluoropropionyl halide wherein an alkali metal chloride, bromide or iodide is contacted with a 3-haloperfluoropropene oxide in admixture in an inert liquid reaction medium.

Preparation of a 2,3-dihaloperfluorocarbonyl halide

Process for preparing haloperfluoro and perfluoro ethers wherein a metal halide is reacted with a 3-haloperfluoropropene oxide to obtain a 2,3-dihaloperfluorocarbonyl fluoride; a metal halide, 2,3-dihaloperfluorocarbonyl fluoride and 3-haloperfluoropropene oxide are reacted to obtain a 2-(2',3'-dihaloperfluoropropoxy)-3-haloperfluoropropionyl fluoride; 2-(2',3'-dihaloperfluoropropoxy)-3-haloperfluoropropionyl fluoride is decarboxylated and dehalogenated to obtain perfluorovinylallylether. Alternatively, 2-(2',3'-dihaloperfluoropropoxy)-3-haloperfluoropropionyl fluoride is reacted with metal halide and 3-haloperfluoropropene oxide to obtain a 2-[2'-(2',3'-dihaloperfluoropropoxy)-3'-haloperfluoropropoxy]-3-haloperflu oropropionyl fluoride, or a higher polyether, and 2-[2'-(2',3'-dihaloperfluoropropoxy)-3'-haloperfluoropropoxy]-3-haloperflu oropropionyl fluoride or the polyether is decarboxylated and dehalogenated to obtain a 3,6-dioxa-5-halodifluoromethylperfluoronona-1,8-diene or the corresponding polyether.

Preparation of haloperfluoro and perfluoro ethers

Homolymers prepared from diunsaturated mono- or poly- haloperfluoro or perfluoro ethers, and copolymers prepared from two or more of such ethers, or one or more of such ethers and one or more other ethylenically unsaturated monomers; and articles fabricated from such polymers.

Polymers of haloperfluoro and perfluoro ethers

An improved process of making an oxidation catalyst containing vanadium, tin, potassium and a silicate binder which comprises employing a porosity control agent and calcination conditions to produce a catalyst having a mean pore diameter in the range of 5-15.mu. and at least 90% of the pores having diameters &lt;10.mu..

Preparation of an improved catalyst for the manufacture of naphthoquinone

Metal pigments when combined with methylchloroform are stabilized by the addition of small amounts of aromatic diepoxides. Other known stabilizers against metals or the active of light and heat may be incorporated.

Stable metal pigment compositions employing methylchloroform as solvent

Metal corrosion in the presence of methylchloroform is inhibited when thiazolidine is added to the methylchloroform. The inhibitor is useful in degreasing processes and may be used in combination with other known inhibitors.

Methylchloroform stabilizer compositions employing thiazolidine

Trichloroethylene is stabilized against oxidation by adding a nitrogen-containing compound selected from among .alpha.-(dimethylamino) propionitrile, thiazole, 1-aza-2-alkoxy-1-cycloalkene and 1,5-diazabicyclo[5.4.0]undec-5-ene. These may be used in combination with ethyl acetate, acetonitrile and pyrazine.

Trichloroethylene composition stabilized against oxidation

A stabilized chlorinated solvent composition useful in removing grease from metals wherein the solvent is perchloroethylene or trichloroethylene, and the stabilizer is N-methyl pyrrole in combination with ethyl acetate, acetonitrile or pyrazine.

Degreaser solvent stabilization

A stabilized methylchloroform for use in vapor degreasing which is stable in the presence of metals which contains pyrazine, dimethoxypropane, an acetylenic alcohol and a nitroalkane or a methylfuran. Such combination prevents corrosion of aluminum, iron, copper and zinc and the decomposition of the solvent.

Stabilized methylchloroform

A stabilized methylchloroform solvent useful in degreasing operations in which the alkylene oxide stabilizer component normally employed is replaced by a tricyclic or quadricyclic compound containing a fused cyclopropane ring.

Cyclopropane ring-containing compounds as inhibitor components in

Methylchloroform formulations are stable in the presence of zinc when they contain cyclopropyl methyl carbinol in place of an epoxide as a component of the stabilizer.

Stabilized methylchloroform formulation containing cyclopropyl methyl

A process for making nitroalkanes in which an alpha-bromoalkanoic acid is reacted with an alkali metal nitrite, e.g. NaNO.sub.2, in the presence of the magnesium ion (Mg.sup.++) in an aprotic solvent to form a chelate. Neutralization of the chelate with a mineral acid produces a nitroalkane having one less carbon atom than the reactant bromoalkanoic acid.

Preparation of nitroalkanes

An alkyl alkynyl sulfide can be employed to stabilizer methylchloroform against reaction with the common metals of construction. Stabilization is enhanced by combining with other known stabilizers. Nitroalkanes, alkyl nitrates or alkynols may be employed to eliminate the need of dioxane and alkylene oxides, while the use of the alkyl nitrates or alkynols eliminates the need for a nitroalkane in the stabilizer formulation.

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Lake Jackson, TX, United States of America

Nobuyuki Ishibe