Wacker-Chemie Gmbh

Hermann Braunling

Tassilo Lindner

Reinhard Jira

Rudolf Reitmeier

Dieter Kippe

Hartmut Menzel

Richard Becker

Process for preparing alkylsilanes having bulky alkyl radicals

Basic polypyrrylenemethines, and salts thereof, having conjugated double bonds and constructed from optionally substituted five-membered heterocyclic rings containing nitrogen, as the only hetero atom in the ring are disclosed, with the five-membered rings, in each case, being bonded to one another in pairs via an optionally substituted carbon atom as a bridging member. The polymer compositions of the invention contain at least five of these five-membered rings and 0 to 50%, relative to the weight of these polymers, of dopants and/or being electrochemically doped. A process for the preparation of the claimed compositions is further disclosed. The polymer compositions of the invention have electroconducting and semi-conducting properties and are useful, for example, in batteries, circuits and switches, if appropriately used in conjunction with other polymers. In addition, the compounds of the invention can also be employed as absorbents for heavy metals and as catalysts.

Basic polypyrrylenemethines and salts thereof, and a process for their

A process for the preparation of 4-chloromethylbenzaldehyde, 4-bromomethylbenzaldehyde and 4-iodomethylbenzaldehyde is disclosed. The desired 4-halomethylbenzaldehyde is prepared by reacting 4-hydroxymethylbenzaldehyde with the appropriate gaseous hydrogen halide and/or with the appropriate aqueous hydrohalic acid. The 4-halomethylbenzaldehydes produced by the disclosed process are useful as raw materials for pharmaceuticals and serve as starting materials for the preparation of conductive organic compounds.

Process for the preparation of 4-halomethylbenzaldehyde

Polymers with conjugated double bonds having heterocyclic and/or carbocyclic rings or ring systems in which said rings or ring systems are linked with one another in pairs via a carbon atom as a bridge member. Polymers of the invention have, at least five of said ring or ring-systems. The polymers may be prepared by reacting at least one compound of the formula ##STR1## with at least one compound of the formula

Polymers with conjugated double bonds

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Burghausen, Germany

Hermann Braunling