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Michael Schmitt

Klaus D Schomann

Sibylle Brosius

Bernhard Albert

Harald Kuppelmaier

Wolfgang Schrott

Peter Neumann

Michael Acker

Matthias Niedenbrueck

Manfred Patsch

Johann-Peter Melder

Ulrich Mueller

Helmut Reichelt

Ulrich Müller

Andrei-Nicolae Parvulescu

Udo Bergmann

Helmut Barzynski

Karl-Heinz Feuerherd

Oihana Elizalde

Rainer Tresch

Stefan Adams

Harald Schlueter

Andreas Weiper-Idelmann

Peter Hammerschmitt

Erich Kromm

Marc Bothe

Roland Merger

Alexander Michael Haydl

Georg Schnitzer

Klaus Becker

Alvaro Gordillo Bolonio

Franz Suetsch

Michael Kuebler

Thomas Heydt

Dirk Bethke

Elena Capito'

Harald Kuppelhamier

Ulrich Harten

Kal-Heinz Feuerherd

Rudolf Krueger

Klaus Guenther

The present invention relates to process for the preparation of a compound of formula (1), wherein Rand Rare independently from each other C-Calkyl, which comprises reacting a compound of formula (2), with a formaldehyde source in presence of a palladium or platinum catalyst at a hydrogen pressure of 5×10mPa to 200×10mPa.

Process for the preparation of piperidine compounds

The present invention relates to a process for the production of 2,2,6,6-tetramethyl-4-piperidone particularly comprising

Heterogeneous catalyzed process for the production of 2,2,6,6-tetramethyl-4-piperidone

A process for coating a surface comprises said surface being coated with particles (A) comprising a core (a) and at least one envelope (b) other than said core (a), and optionally with at least one hydrophobicizing agent (B) and thereafter thermally treated.

Method for coating surfaces and suitable particles therefor

A process for preparing a liquid formulation of salts of sulfonated azo dyes, comprising a) preparing vesuvin from m-phenylenediamine; b) without interveningly isolating the vesuvin coupling an at least equimolar amount of diazotized aminoarylsulfonic acids IHN&#x2014;Ar&#x2014;SOH&#x2003;&#x2003;(I),where Ar is phenylene (which may be monosubstituted by sulfo) or naphthalene (which may be mono- or disubstituted by sulfo and/or monosubstituted by hydroxyl) onto vesuvin and c) isolating the dyes in their acid form and subsequently dissolving them in aqueous bases.

Method for producing a liquid formulation of salts of sulfoacidic azo dyes

Preparation of liquid formulations of basic azo dyes

Carbonyloxy-substituted azulenesquaric acid dyes of the formula ##STR1## where L is C.sub.1 -C.sub.12 -alkylene which may be substituted by phenyl,

Carbonyloxy-substituted azulenesquaric acid dyes, intermediates therefor

Dyeing cellulose-containing textile material with hydrogenated indigo

Polycyclic vat dyes of the general formula I ##STR1## where X is hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, halogen or nitro, obtainable by reacting (9)-benzo-5-aminoanthraquinonyl(2,1-h)-8-azapyrenone-3(II) ##STR2## with a benzoyl chloride of the formula III ##STR3## in a dipolar aprotic solvent.

Polycyclic vat dyes

Vat dyes obtainable by a) halogenation of dibenzanthrone with bromine in the presence of chlorosulfonic acid and of a halogenation catalyst to a bromine content from 26 to 32% by weight and a chlorine content from 1 to 5% by weight, and b) condensation of the isolated halogenation product with 1-aminoanthraquinone in a molar ratio from 1:2 to 1:2.5 in the presence of an inert solvent, the concentration of halogenated dibenzanthrone and 1-aminoanthraquinone together being at least 200 g/l of solvent are useful for dyeing or printing cellulose-containing textile material.

Vat dyes

There are described the preparation of 5-halo-2-(1-anthraquinonylamino)benzoic acids of the general formula I ##STR1## (X.sup.1 : Cl or Br; X.sup.2 : H, Cl or Br, identical or different when n&gt;1; n: 1-6) by reacting 2-(1-anthraquinonylamino)benzoic acids II ##STR2## with the halogen in the presence of sulfuric acid, and the preparation of 4'-halo-2,1(N)-anthraquinonyl-1',2'(N)-benzacridones III ##STR3## by cyclizing condensation of the acids I.

Preparation of 5-halo-2-(1-anthraquinonylamino)-benzoic acids and

7,16-Dichlorodianthraquinone-N,N'-dihydroazine (I) ##STR1## is prepared by condensing 1-amino-3-chloroanthraquinone (II) in the presence of an alkaline condensing aid, of an oxidizing agent and of a urea derivative (III) ##STR2## (R: identical or different alkyl groups having 1 to 4 carbon atoms, which may be joined together to form a 5- or 6-membered ring that contains the urea group).

Preparation of 7,16-dichlorodianthraquinone-N,N'-dihydroazine

A process for preparing dianthraquinone-N,N'-dihydroazine (I) ##STR1## and its chlorination products (Ia) ##STR2## where n is 1 or 2, by condensation of 1-aminoanthraquinone (II) in the presence of an alkaline condensing aid, an oxidizing agent and a cyclic urea derivative at from 80.degree. to 150.degree. C. and subsequent purification and/or chlorination comprises using N,N'-dimethylpropyleneurea as the urea derivative.

Preparation of dianthraquinone-N,N'-dihydroazine and its chlorination

Indolizinetrimethine dyes

Moving laser beams from useful tracks to alternative positions in devices in which information is stored optically or magneto-optically. This results in higher signal-to-noise ratios.

Repositioning laser beams in information storage media

Binary azulenesquaric acid dyes of the formula ##STR1## where X is a bridging member, Y is hydrogen, cyano or formula CO--OR.sup.5, CO--NHR.sup.5, OR.sup.5, O--CO--OR.sup.5, NH--CO--R.sup.5, NH--CO--OR.sup.5 or NH--SO.sub.2 --R.sup.5, where R.sup.5 is hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.2 -C.sub.12 -alkenyl, C.sub.5 -C.sub.7 -cycloalkyl or unsubstituted or substituted phenyl, L.sup.1 and L.sup.2 are each, independently of one another, a chemical bond or unsubstituted or substituted C.sub.1 -C.sub.12 -alkylene and R.sup.1, R.sup.2, R.sup.3, R.sup.4, Q.sup.1, Q.sup.2, Q.sup.3 and Q.sup.4 are each, independently of one another, hydrogen or unsubstituted or substituted C.sub.1 -C.sub.12 -alkyl, their intermediates and an optical recording medium containing the novel dyes are described.

Binary azulenesquaric acid dyes, their intermediates and optical

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Worms, Germany

Michael Schmitt