Dynamit Nobel Aktiengesellschaft

Wilhelm Vogt

Hermann Richtzenhain

Uwe Prange

Moustafa El-Chahawi

Norbert Vollkommer

Egon N Petersen

Gunter Zoche

Hermann Peeters

Georg Blumenfeld

Fritz Englaender

Helmut Aus Der Funten

Gerhard Daum

Moustafa El Chahawi

Christoph Theis

Hans-Georg Schmidt

Norbert Volkommer

Herman Richtzenhain

Georg Blumfeld

Hermann Richtzenbain

Hermann Richtzenheim

Disclosed is a method for the preparation of 3-aminoacrylic acid esters by the addition of a beta-hydroxyacrylic acid esters to an aqueous solution of an amine salt.

Method for the preparation of 3-aminoacrylic acid esters

Disclosed is a method for preparation of alkoxymethylene compounds, especially methoxymethylene compounds, from substituted or unsubstituted acetic acid alkyl esters, especially methyl esters, from the corresponding hydroxymethylene compounds or their alkali salts, by reaction with excess alkanol, especially methanol, in the presence of HCl and a water-binding agent. Preferred are water-binding agents which form stable reaction products with water.

Method for the preparation of alkoxymethylene compounds of acetic esters

The present invention relates to a method of preparing 10,11-dihydro-5H-dibenzo[a,d]cycloheptene-5-one or substitution products thereof from dibenzyl-o-carboxylic acid or its corresponding substitution products, by cyclocondensation. The cyclocondensation is performed in either of two ways, namely (a) with catalytic amounts of a concentrated acid as catalyst, or (b) with the aid of di- and/or trichloromethyl aromatic compounds in the presence of catalysts, preferably catalysts from the group of the Lewis acids.

Process for preparing 10,11-dihydro-5H-dibenzo[a,d]cycloheptene-5-one

A method is disclosed whereby uracil is obtained from alkali formyl acetic acid alkyl esters by reacting such esters with thiourea and then with hydrogen peroxide without isolating the intermediates, and then separating the uracil by precipitation with acids.

Method of preparing uracil

Enol ethers of the formula ##STR1## and/or the corresponding acetals can be obtained from acyloxymethylene compounds of the corresponding structure by reaction with the corresponding alcohol, in the presence of acid catalysts if desired.

Method of preparing acetals and enol ethers from acyloxymethylene

The present invention relates to the hydrogenation of phthalic acid anhydride to phthalide. A nickel catalyst of low nickel content is used as hydrogenation catalyst, and a benzoic acid alkyl ester as solvent. Small amounts of an alkanol can be added to the benzoic acid ester. On the basis of these specific conditions, the formation of by-products such as toluylic or phthalic acids in the hydrogenation is greatly diminished, and phthalide yields are obtained which, if the preferred conditions are maintained, can amount to as much as 90%.

Method of preparing phthalide

Production of malonic acid dialkyl esters by reacting halogen acetic acid alkyl ester with carbon monoxide, and alkali metal alcoholate, alkaline earth metal alcoholate or a solution of alkali metal hydroxide in an alcohol at a pH of up to 8.5 in the presence of a cobalt compound which is a catalyst for the reaction.

Method of preparing malonic acid dialkyl esters

Improvement in the process of producing carboxylic acid esters or salts involving contacting a halogen alkyl compound with carbon monoxide and a basic substance in the presence of a carbonylation catalyst for carbonylation of the halogen alkyl and production of the corresponding ester or salt of the basic substance. The improvement involves performing the contacting in a reaction vessel, circulating a liquid mass of the halogen alkyl, basic substance and carbonylation catalyst through the vessel and maintaining a carbon monoxide atmosphere in the vessel, injecting the circulating liquid mass into the vessel with a nozzle to spray the liquid mass into the vessel and intimately mixing the liquid mass with carbon monoxide in the nozzle for injection of carbon monoxide into the vessel with the sprayed liquid mass.

Method and apparatus for performing carbonylation reactions

Production of malonic acid dialkyl esters by reacting halogen acetic acid alkyl ester with carbon monoxide, and alkali alcoholate, alkali earth alcoholate or a solution of alkali hydroxide in an alcohol at a pH of up to 8.5 in the presence of a cobalt compound which is a catalyst for the reaction.

New process for making esters of .alpha.-hydroxymethylene arylacetic acid from the corresponding arylacetic acid ester by conversion with an alkali alcoholate and carbon monoxide. The resulting hydroxy methylene compound can be obtained from the resulting alkali salt by release with an acid.

Process for the preparation of .alpha.-hydroxymethylene arylacetic acid

A process for the preparation of a .beta.-alkoxyacrylonitrile of the formula

Method of preparing .beta.-alkoxyacrlonitriles

Halogen-containing bis-acrylates and bis-methacrylates corresponding to the formula ##STR1## in which R represents hydrogen or a methyl group and X represents chlorine and/or bromine, are provided as well as a process for producing such compounds. The compounds are useful for the formation of polymers and copolymers and as cross-linking agents. Also included in the invention are the polymers and copolymers based on the above-described halogen-containing bis-acrylates and bis-methacrylates, methods for the production of said polymers and the use of said polymers as flame proofing agents, etc.

Halogen-containing unsaturated bis-esters and polymers and copolymers

A method has been invented for preparing phthalide by catalytic hydrogenation with a Periodic Table, Group VIII catalyst of a phthalide substituted in the 3-position by a hydroxyl, methoxy or acetoxy group.

An improvement in the process for preparing an orthoacetic acid alkyl ester of the formula ##STR1## wherein R is a saturated, branched or un-branched, alkyl moiety of 1 to 8 carbon atoms by: (a) contacting acetonitrile with an anhydrous alkanol having 1 to 8 carbon atoms and dry hydrogen chloride in the presence of an organic solvent to prepare the corresponding imidoester hydrochloride; (b) thereafter contacting said imidoester hydrochloride in the acid-free state with an alkanol having 1 to 8 carbon atoms; and (c) removing by-product ammonium chloride from the resultant reaction mixture and distilling the reaction mixture to recover orthoacetic acid alkyl ester, the improvement residing in (d) employing as the organic solvent an inert solvent having a dielectric constant measured at 25.degree. C. of 2.6 or less; and (e) contacting said imidoester hydrochloride in step (b) with an alkali metal or alkaline earth metal alcoholate before contacting the same with said alkanol. Also disclosed is a process in which steps (a) and (b) are performed coterminously without isolation or recovery of the intermediate imidoester hydrochloride.

Method of preparing orthoacetic acid alkyl esters

Process of preparing an .alpha.,.beta.-unsaturated carboxylic acid ester, comprising contacting an .alpha.,.beta.-unsaturated halogen compound with carbon monoxide, an alkali alcoholate in the presence of a metal carbonyl as catalyst, in an alcohol that is the basis of the alkali alcoholate, at a pH of 8.5-11.5. Thereby, for example, crotonic acid methyl ester can be produced from allyl chloride.

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Cologne, Germany

Wilhelm Vogt