Dynamit Nobel Aktiengesellschaft

Huls Aktiengesellschaft

Fritz Englaender

Wilhelm Vogt

Moustafa El-Chahawi

Klaus D Steffen

Fritz Robert Kappler

A method of preparing a compound of the formula ##STR1## in which R.sub.1 is CH.sub.3 or C.sub.2 H.sub.5,

Method of manufacturing substituted monoamides of dicarboxylic-acid

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

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 method has been invented for the preparation of phthalide which comprises chlorinating o-toluic acid at 30.degree.-260.degree. C. and recovering the phthalide obtained.

Method of preparing phthalide

An improvement in a process for preparing phthalide by reacting chlorophthalide with hydrogen in the presence of a catalyst at a temperature between 50.degree. and 350.degree. C., the improvement residing in carrying out the process in the absence of a hydrogen chloride acceptor, flowing the chlorophthalide continuously in fluid form through a solid catalyst bed in a reactor, passing the hydrogen through in such an excess so as to sweep off the hydrogen chloride formed and withdrawing phthalide in fluid form.

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Bonn, Germany

Fritz Englaender