Societe Francaise Hoechst

Clariant Specialty Fine Chemicals (france)

Clariant Speciality Fine Chemicals (france)

Nobel Hoechst Chimie

Clariant (france)

Clariant Chimie S.a.

Weylchem Lamotte S.a.s.

Jean-Claude Vallejos

Yani Christidis

Didier Wilhelm

Alain Schouteeten

Muriel Albalat

Alain Perrard

Geraldine Primazot

Christian Roussel

Pierre Gallezot

Sébastien Jus

Muriel Serradeil Albalat

Géraldine Primazot

Laurent Carmona

Nathalie Carmona

The invention relates to a process for preparing optically active &#x3b1;-aminoacetals by resolution of a racemic mixture or of a mixture of enantiomers via the formation of diastereoisomeric salts, and also novel intermediates in the form of diastereoisomeric salts.

Process of preparation of optically active &#x3b1;aminoacetals

The invention relates to a process for the preparation of N-protected &#x3b1;-aminoaldehydes by deacetalization of the acetal functional group of corresponding N-protected &#x3b1;-aminoacetals using formic acid.

Process for deacetalisation of &#x3b1; aminoacetals

The invention relates to a process for the synthesis of stilbene derivatives of formula (I)-(E) or (I)-(Z) in which R represents hydrogen or an OH group,by deprotection in the presence of an aluminum halide and of a tertiary amine of a compound of formula (II)-(E) or (II)-(Z) in which A represents hydrogen or an OR'group, and R, R, Rand R&#x2032;independently represent an alkyl or aralkyl group.

Process for the synthesis of polyhydroxystilbene compounds

The invention relates to a process for preparing &#x3b1;-aminoacetals substantially in racemic form, comprising a step of oxidizing optically enriched &#x3b1;-aminoacetals to the corresponding oximes, in the presence of a catalyst, and a step of reducing the oximes thus obtained.

Process of racemisation of optically active alpha aminoacetals

A subject-matter of the present invention is a novel process for the synthesis of (E)-stilbene derivatives targeted at obtaining in particular resveratrol and piceatannol.

Process for the synthesis of (E)-stilbene derivatives which makes it possible to obtain resveratrol and piceatannol

Process for the preparation of primary amines of formula (I): where R3 represents an alkyl, cycloalkyl or aralkyl group, by reaction of a triazolium salt of formula (II): where R1 and R2 represent hydrogen or an alkyl, aralkyl or aryl group, R4 represents an alkyl or aralkyl group or a residue of an organic polymer functionalized by an alkylating group, and Arepresents a halogen, alkylsulphonate, arylsulphonate, alkyl sulphate, hydrogensulphate, hemisulphate, perchlorate or hydroxide, with a hydride, in order to obtain an amine of formula (I), which is isolated, if desired, and intermediates.

Process for the preparation of primary amines

A process for the preparation of the enol lactone of 2-oxocyclohexylidene acetic acid wherein

Process for the preparation of the enol lactone of 2-oxocyclohexlidene

Preparation process for 2-coumaranone in which glyoxylic acid, in vapor phase, is reacted with cyclohexanone, in the presence of a dehydrogenation catalyst.

Preparation method for 2-coumaranone

Preparation process for a hydroxyphenylacetic acid of formula (I): ##STR1## where R.dbd.H, alkyl or alkoxyl as well as its salts, in which the corresponding free or salified hydroxymandelic acid of formula (II): ##STR2## in which R has the meaning given previously and M.dbd.H, K or an ammonium group is reacted in an aqueous medium, at a temperature greater than or equal to 50.degree. C., with formic acid in the presence of catalytic quantities of an oxygenated derivative of sulphur having a degree of oxidation from 2 to 4, in order to obtain the hydroxyphenylacetic acid of formula (I) which is isolated or, if desired, is salified according to the usual methods and the hydroxyphenylacetic acid thus obtained.

Preparation process for hydroxyphenylacetic acids

Process for obtaining an arylacetic acid of general formula (I):

Preparation process for arylacetic acids and their alkali metal salts

Transvinylation process between vinyl acetate or vinyl propionate and a carboxylic acid of general formula (I),

Transvinylation of carboxylic acids

The invention provides an improved process for the manufacture of alkyl pyruvates having general formula (I):

Process for the manufacture of alkyl pyruvates

A process for preparation of substituted acetic acids having the general formula I:

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Paris, France

Jean-Claude Vallejos