Centre National De La Recherche Scientifique

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Universite Montpellier Ii Sciences Et Techniques Du Languedoc

Picometrics S.a.

Louis Mion

Auguste Andre Commeyras

Jacques R Taillades

Robert J Pascal

Alain Rousset

Jean Brugidou

Monique Lasperas

Regine Sola

Patrick Calas

Aldo Previero

Sylvie Benefice

Odile Vandenabeele

Helene Collet

Monique Lasperas Nee Marnier

Laurent Garrelly

Henri Choukroun

Catherine Bied

A method for detecting traces of pollutant in aqueous media, wherein the method includes the use of isocyanates to react on the nucleophilic functions in the form of trace amounts in a wet medium. The method for assaying nulceophilic functions in a wet medium includes the following steps: adding isocyanates to an aqueous solution of basic pH containing the nucleophilic functions to be tested; maintaining the solution for an interval ranging from a few minutes to several dozens of minutes at a temperature lower than 100&deg; C.; and assaying the resulting carbamate, thiocarbamate or urea.

Use of isocyanates for assaying nucleophilic functions in the form of traces in wet medium

Method for peptide synthesis starting from N- (N'-nitrosocarbamoyl)

This invention relates to a process for the catalytic hydrolysis of an .alpha.-aminonitrile in the heterogeneous phase, and to polymeric resins having a catalytic activity for carrying out the present process. The process according to this invention is characterized in that said .alpha.-aminonitrile or one of the salts thereof is reacted in an aqueous medium, in the heterogeneous phase and in the presence of hydroxide ions on a polymeric resin which contains side chains carrying a carbonyl group, and which is insoluble in the aqueous basic medium.

Process for catalytic hydrolysis of an .alpha.-amino- nitrile in

The device for carrying out the continuous process for synthesizing an .alpha.-amino acid incorporates: (a) a vessel (10) for feeding .alpha.-amino-nitrile, or one of its salts; (b) a connecting pipe (12), in which a pump (14) is mounted, connecting the feed vessel (10) to (c) a catalysis column (16) containing a carbonyl-containing polymeric resin (18) which is insoluble in basic aqueous medium; (d) a connecting pipe (20) from the catalysis column (16) to (e) a hydrolysis reactor (22), acting simultaneously as a reservoir for the .alpha.-amino acid salt formed, and equipped with (f) means for feeding hydroxide ions, comprising a feed vessel (24), a pipe (26) and a pump (28); and (g) a pipe (30) for drawing off the .alpha.-amino acid salt formed.

Continuous process for synthesizing an .alpha.-amino acid by chemical

A process for the chemical catalytic hydrolysis of an .alpha.-aminonitrile or of one of the salts thereof, characterized in that an aqueous solution containing at least one carbonyl derivative is reacted with the said .alpha.-amine nitrile or with one of the salts thereof in the presence of hydroxide ions.

Process for the chemical catalytic hydrolysis of an .alpha.-aminonitrile

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Montpellier, France

Louis Mion