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Centre National De La Recherche Scientifique

Université Claude Bernard

Robert Huet

Thomas Walther

Patrick Rey

Vivien Henryon

Magali Remaud-Simeon

Isabelle Andre

Christopher Topham

Jean Marie Francois

Pierre Buisson

Jean-Marie Francois

Jean-Eudes Vendeville

Hélène Cordier

Helene Cordier

Clémentine Dressaire

Sebastien Fournier

Jean-Michel Joerger

Virginie Belliere-Baca

Jean-Marc Millet

Pavel Afanasiev

Sylvain Aubry

Thi Tuyet Nhung Nguyen

Claude Aleman

Thi Tuyet Nhung Dudesert

Sébastien Fournier

Cordier Hélène

A method for the preparation of 2,4-dihydroxybutyric acid from homoserine includes a first step of conversion of the primary amino group of homoserine to a carbonyl group to obtain 2-oxo-4-hydroxybutyrate, and a second step of reduction of the obtained 2-oxo-4-hydroxybutyrate (OHB) to 2,4-dihydroxybutyrate.

Method for the preparation of 2,4-dihydroxybutyrate

A method for preparing a compound of formula (I)   

Method for synthesising vitamin A

A method for preparing dehydro-cyclofarnesal from dehydro-farnesal by cyclization in the presence of an acid may include the dehydro-farnesal being obtained from the farnesal by dehydrogenation and may further includes the cyclization being carried out in the presence of an acid selected from Lewis acids, Bronstedt acids, and zeolites. The synthesis of vitamin A using this method further includes the conversion of dehydro-cyclofarnesal into vitamin A.

A method of producing 2,4-dihydroxybutyric acid (2,4-DHB) by a synthetic pathway that includes transforming malate into 4-phospho-malate using a malate kinase, then transforming 4-phospho-malate into malate-4-semialdehyde using a malate semialdehyde dehydrogenase, and then transforming malate-4-semialdehyde into 2,4-DHB using a DHB dehydrogenase.

Method of production of 2,4-dihydroxybutyric acid

Disclosed are pulverulent compositions of a complex between an acid and a metal, having a high organosulfur compound content, and method for preparing same.

Pulverulent compositions of a complex between an acid and a metal having a high organosulfur compound content and method for preparing same

The invention relates to a method for preparing an olefine, a diene or a polyene, by catalytic conversion of at least one alcohol having a carbon chain of at least three carbon atoms and different from propan-2-ol, in the presence of at least one catalyst based of at least one phosphate of a metal or several metals M, M being chosen from among the 15 lanthanides (Lanthanum, Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium), Yttrium, Scandium and Boron, and the applications of this method.

Method for producing an olefin by catalytic conversion of at least one alcohol

Pulverulent compositions of a complex between an acid and a metal form an at least partially spherical particle. The acid is selected from 2-hydroxy-4-methyl-thiobutanoic acid (HMTBA), methionine, aspartic acid, the alginic acids, the pectinic acids, and the corresponding anions, in particular 2-hydroxy-4-methyl-thiobutanoate, methioninate, aspartate, the alginates and the pectinates. The metal is divalent or trivalent. The particle has an amorphous fraction the mass of which represents at least 50% of the total mass of the particle. The particle is substantially devoid of uncomplexed acid or anion and of uncomplexed metal or metal cation.

Pulverulent compositions of a complex between an acid and a metal and method of preparation thereof

A method of producing 2,4-dihydroxybutyric acid (2,4-DHB) by a synthetic pathway that includes the transforming malate in 4-phospho-malate using a malate kinase, said 4-phospho-malate being transformed in malate-4-semialdehyde using a malate semialdehyde dehydrogenase and said malate-4-semialdehyde being transformed in 2,4-DHB using a DHB dehydrogenase.

The invention relates to a method for preparing an amino acid, or its salts, from 2-aminobutyrolactone (2ABL), said amino acid fitting the formula I, XCHCHCHNHCOOH, wherein X is such that Xrepresents a nucleophilic ion, according to which N-carboxylation of 2-aminobutyrolactone (2ABL) is achieved with carbon dioxide, and the thereby obtained 2ABL carbamate is reactive with an XH reagent or its salts.

Method for preparing an amino acid from 2 aminobutyrolactone

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Paris, France

Robert Huet