Basf Aktiengesellschaft

Wolfgang Brox

Volker Bach

Axel Paul

Karl-Heinz Etzbach

Gerhard Wagenblast

Karl Siemensmeyer

Marc Walter

Ralf Schulz

Eberhard Ammermann

Gisela Lorenz

Norbert Goetz

Reiner Kober

Ulrike Licht

Rainer Seele

Peter Schwab

Heiko Maas

Harald Fuchs

Hans-Peter Neumann

Dirk Funhoff

Bernd Bessling

Wolfgang Schrepp

Jean Werner Knab

Bernd Lohe

Kark-Heinz Etzbach

C-C-olefins are oligomerized in a process in which a stream of an olefin-containing hydrocarbon mixture is passed over a heterogeneous, nickel-containing oligomerization catalyst in n successive adiabatically operated reaction zones, where n&#x2267;2, and the hydrocarbon mixture experiences a temperature increase 66 Tin each reaction zone and the hydrocarbon mixture enters the first reaction zone at a temperature Tand before entering each further reaction zone is cooled to a temperature which in each case may be up to 20&#xb0; C. above or below T, and the relative catalyst volumes of the individual reaction zones are such that the difference in &#x394;Tbetween any two reaction zones is not more than 20&#xb0; C.

Method for the oligomerization of C2 C8-olefins

In a process for oligomerizing C -olefins by reactin of a C -olefin-containing reaction mixture over a nickel-containing fixed-bed catalyst, the reaction over the fixed-bed catalyst is run at a conversion to oligomerized C -olefins of not more than 30% by weight, based on the reaction mixture.

Method for oligomerizing C6-olefins

Method and device for obtaining isobutenes from conjugated hydrocarbons

Optically active compounds of the formula I ##STR1## where R is C.sub.1 -C.sub.12 -alkyl or -perfluoroalkyl in which one or two non-adjacent CH.sub.2 or CF.sub.2 groups can also be replaced by --O-- and/or --CO-- and/or --CO--O-- and/or --CH.dbd.CH-- and/or --CH-halogen- and/or --CHCN-- and/or --O--CO--CH-halogen- and/or --O--CO--CHCN--, or is C.sub.1 -C.sub.12 -alkyl which can have a terminal chemically reactive group and in which a CH.sub.2 group can be replaced by --O--,

Optically active phenoxypropionic esters

Optically active compounds of the formula I ##STR1## where R is C.sub.1 -C.sub.12 -alkyl or -perfluoroalkyl in which one or two non-adjacent CH.sub.2 or CF.sub.2 groups can also be replaced by --O-- and/or --CO-- and/or --CO--O-- and/or --CH.dbd.CH-- and/or --CH-halogen-- and/or --CHCN-- and/or --0--CO--CH-halogen-- and/or --O--CO--CHCN--, or is C.sub.1 -C.sub.12 -alkyl which can have a terminal chemically reactive group and in which a CH.sub.2 group can be replaced by --O--,

Novel laser-optical recording elements which can be repeatedly erased and recorded on contain recording layers (a) which exhibit enantiotropic, ferroelectric smectic liquid crystalline (S.sub.c*) behavior, so that they can be switched back and forth between two thermodynamically stable, optically distinguishable ferroelectric smectic liquid crystalline S.sub.c* order states on exposure to a laser beam of sufficient luminous power, by applying an external electric field. The recording layers (a) themselves consist mainly or exclusively of novel polymers P having chiral mesogenic side groups. The novel polymers P are prepared using the novel monomers of the general formula I ##STR1## where R is hydrogen, chlorine or methyl, A is a flexible space-maintaining long-chain molecular moiety, and C is an optically active chiral molecular moiety and B is a mesogenic molecular moiety composed of at least three aromatic nuclei which are bonded linearly or virtually linearly to one another, or they are prepared using the novel monomers I which contain specially selected molecular moieties B in a novel combination with selected molecular moieties C.

Monomers and their use for the production of a laser-optical recording

Azolylethane derivatives of the formula I ##STR1## where A and R.sup.1 are each alkyl, phenyl, biphenyl, naphthyl, benzyl, cycloalkyl, alkoxy, alkylthio, phenoxy, benzyloxy, phenylthio, methoxycarbonylethyl or hetaryl, these radicals being substituted or unsubstituted,

Fungicidal azolylethane derivatives

Novel laser-optical recording elements which can be repeatedly erased and recorded on contain recording layers (a) which exhibit enantiotropic, ferroelectric smectic liquid crystalline (S.sub.c*) behavior, so that they can be switched back and forth between two thermodynamically stable, optically distinguishable ferroelectric smectic liquid crystalline S.sub.C* order states on exposure to a laser beam of sufficient luminous power, by applying an external electric field. The recording layers (a) themselves consist mainly or exclusively of novel polymers P having chiral mesogenic side groups. The novel polymers P are prepared using the novel monomers of the general formula I ##STR1## where R is hydrogen, chlorine or methyl, A is a flexible space-maintaining long-chain molecular moiety, and C is an optically active chiral molecular moiety and B is a mesogenic molecular moiety composed of at least three aromatic nuclei which are bonded linearly or virtually linearly to one another, or they are prepared using the novel monomers I which contain specially selected molecular moieties B in a novel combination with selected molecular moieties C.

Novel laser-optical recording elements which can be repeatedly erased and recorded on contain recording layers (a) which exhibit enantiotropic, ferroelectric smectic liquid crystalline (S.sub.C*) behavior, so that they can be switched back and forth between two thermodynamically stable, optically distinguishable ferroelectric smectic liquid crystlaline S.sub.C* order states on exposure to a laser beam of sufficient luminous power, by applying an external electric field. The recording layers (a) themselves consist mainly or exclusively of novel polymers P having chiral mesogenic side groups. The novel polymers P are prepared using the novel monomers of the general formula I ##STR1## where R is hydrogen, chlorine or methyl, A is a flexible space-maintaining long-chain molecular moiety, and C is an optically active chiral molecular moiety and B is a mesogenic molecular moiety composed of at least three aromatic nuclei which are bonded linearly or virtually linearly to one another, or they are prepared using the novel monomers I which contain specially selected molecular moieties B in a novel combination with selected molecular moieties C.

The novel compounds of the general formula I ##STR1## where X is straight-chain or branched alkanediyl having from 1 to 20 carbon atoms or

Growing community of inventors

Heidelberg, Germany

Wolfgang Brox