Nitrokemia Ipartelepek

Sandor Balint

Csaba Soptei

Zoltan Kolonics

Jeno Pelyva

Bela Karacsonyi

Laszlo Lendvai

Janosne Benczik

Judit Benczik Nee Pasztor

Csaba Kayos

Sandor Laszlo

Lajos T Nagy

Sandor Gaal

Elemer Tomordi

Jozsef Karsai

Dezso Sebok

Ivan Gardi

Gyorgy Kiss

Andras Horvath

Laszlo Legradi

Endre Sebestyen

Pal Agocs

Imre Csatlos

Tibor Kranitz

Jozsef Fodor

Andras Papp

Sandor Silye

Jolan Cseke

Process for the preparation of N-phenyl-N-methoxyacetyl-DL-alanine methyl ester derivatives of the formula (I). ##STR1## wherein R is a C.sub.1-4 alkyl residue; and n is a cardinal number between from 1 to 3, which comprises reacting an N-methoxyacetyl derivative of the formula (II). ##STR2## wherein R and n are as defined above, with a stoichiometric amount of an alkaline metal alkoxide, at a temperature between 80.degree. C. and 150.degree. C., until completion of the removal of the alkanol present in the system, then reacting the thus obtained alkaline metal salt of the compound of formula (II) directly or after isolation with a methyl DL-x-halopropionate.

Process for preparing N-phenyl-N-methoxyacetyl-DL-alanine methyl ester

The invention relates to an improvement of a process for preparing N-phosphonomethyl-glycine by oxydation of N-phosphonomethyl-imino-diacetic acid in an aqueous sulphuric acidic medium with hydrogen peroxide. A characteristic feature is using a waste acid liquor as reaction medium formed as aqueous sulphuric acid and obtained after the separation of N-phosphonomethyl-glycine when carrying out oxydation. This solution is optionally diluted with water until a concentration of 12-18 weight % of sulphuric acid and 3-5 weight % of N-phosphonomethyl-glycine.

Process for preparing N-phosphonomethyl-glycine

The invention relates to the preparation of N-phosphono-methyl-imino-diacetic acid from the calcium salt of imino-diacetic acid in a simplified synthesis. The process comprises in that the imino-diacetic acid calcium salt is heated with concentrated hydrochloric acid in a molar ratio of 2-3:1 at a temperature between 50.degree.-100.degree. C., the obtained imino-diacetic acid hydrogen-chloride is separated then dissolved in water and is reacted with phosphorous acid in a molar ratio of 1.0-1.2:1 calculated for imino-diacetic acid hydrogen chloride and with the aqueous solution of formaldehyde in a molar ratio of 1.0-1.4:1 under stirring, and the obtained product is isolated.

Process for preparing N-phosphono-methyl-imino-diacetic acid

2-chloro-ethyl phosphonic acid esters and plant growth regulating agents

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Balatonalmadi, Hungary

Sandor Balint