Abstract: A process for separating the diastereomers of RSS— and SSS—N-?[1-carboxy-3-phenylpropyl]lysylproline is described. Previous chromatographic processes for separating the diastereomers of this peptide active substance, such as for example adsorption chromatography, exhibited disadvantages with regard to the solvents used and throughput. These disadvantages do not occur if basic ion exchangers are used in the chromatographic separation of the diastereomers. In particular, purely aqueous solutions may be used as the eluent.

Abstract: A product made from plastic and composed, at least in part, of a thermoplastic molding composition which comprises polyamide and comprises from 3 to 30% by weight of a conductivity black, where the conductivity black is defined by the following parameters:

Abstract: A urethanized &bgr;-hydroxyalkylamide compound, a process for its preparation, and powder coating materials containing them.

Abstract: A product made from plastic and composed, at least in part, of a thermoplastic molding composition which comprises polyamide and comprises from 3 to 30% by weight of a conductivity black, where the conductivity black is defined by the following parameters: a) DBP absorption of from 100 to 300 ml/100 g; b) a specific surface area of from 30 to 180 m2/g; c) an ash content of less than 0.1% by weight and d) a grit content of not more than 25 ppm, has improved heat-ageing resistance, and also improved resistance to peroxide-containing motor fuels.

Abstract: A process for the preparation of cyclooctanol from cyclooctene comprising: a. reaction of cyclooctene with formic acid in the absence of an added catalyst to produce a two-phase reaction mixture containing cyclooctyl formate and residual formic acid, b. separation of the two phases into a lower phase rich in formic acid (phase A) and an upper phase low in formic acid (phase B), c. extraction of cyclooctyl formate from phase A to obtain an extract, d. combination of phase B and the extract from phase A, e. distillative work-up of the combination of phase B and the extract from phase A in an apparatus fitted with a short distillation path to obtain crude cyclooctyl formate, and f. catalytic transesterification of the cyclooctyl formate of said crude cyclooctyl formate with an alcohol to produce cyclooctanol.

Abstract: The present invention provides a process for producing N-acyl-protected amino acids with the general formula I by amidocarbonylation whereby carbon monoxide, an amide/nitrile and an aldehyde, are reacted in the presence of a metal catalysts such as rhodium, iridium or ruthenium catalysts.

Abstract: The invention relates to a process for preparing vinyl chlorosilanes, that includes thermally and non-catalytically reacting chlorosilane with vinyl chloride at a temperature of 550 to 700° C. by flowing the chlorosilane and vinyl chloride through a ring-gap space in a ring-gap reactor to produce a reaction gas; the ring-gap space having a cross-sectional area and a volume; and, after the flowing, further reacting, adiabatically, the reaction gas in a second zone to produce a hot reaction gas that contains vinylchiorosilane; wherein the second zone has a cross-sectional area that is greater than the cross-sectional area of the ring-gap space; and wherein the second zone has a volume that is in a ratio to the volume of the ring-gap space of 0.15:1 to 1.5:1. The invention also provides an apparatus for carrying out the above process.

Abstract: The invention relates to a process for preparing vinylchlorosilanes by thermal non-catalyzed reaction of chlorosilanes with vinyl chloride at from 550 to 700° C., using a ring-gap reactor which includes rapidly cooling the hot reaction gases after they have flowed through the ring-gap space, by quenching them with a liquid.

Abstract: The invention involves a procedure for the catalytic enantioselective reduction of ketones to chiral alcohols. Heretofore, this reaction was carried out batch-wise. Because, in this procedure, one utilizes a catalyst increased in size with polymer, it is possible to carry out the reaction in a quasi-continuous manner in a membrane reactor. In contrast to the state of the art, one thus dramatically increases the operative life of the catalyst.

Abstract: Process for the preparation of N-acetyl protected amino acids of Formula I by amido carbonylation utilizing carbon monoxide, nitrile, and an aldehyde in the presence of a metal catalyst.

Abstract: The invention concerns biologically degradable polyesterS which are degraded under the action of micro-organisms in the natural environment. Said polyesters are high molecular weight satistical copolyesters which are made using an aliphatic polyalcohol, an aromatic polycarboxylic acid and also an aliphatic polycarboxylic acid as monomer components. They contain constitutional repeating or recurrent units comprising (i) a polyalcohol and an aromatic polycarboxylic acid and (ii) a polyalcohol and an aliphatic polycarboxylic acid, where over 90% of the units of type (i) are directly bonded with none or at most one other unit of type (i). The polyesters are produced by using a di-isocyanate as an additional monomer component, less isocyanate being used than any of the other monomer components. The present invention also concerns materials made from said biodegradable polyester and a process for producing said polyesters.