Abstract: A pseudo-substrate (1, 11) for use in the production of semiconductor components, having a carrier substrate (2, 12) with a crystalline structure and a first buffer (3, 13), which is arranged on a surface of the carrier substrate (2, 12), if appropriate on further intervening intermediate layers, wherein the first buffer (3, 13) is embodied as a single layer or as a multilayer system and includes, at least at the surface facing away from the carrier substrate (2, 12), arsenic (As) and at least one of the elements aluminum (Al) and indium (In).

Abstract: A pseudo-substrate (1, 11) for use in the production of semiconductor components, having a carrier substrate (2, 12) with a crystalline structure and a first buffer (3, 13), which is arranged on a surface of the carrier substrate (2, 12), if appropriate on further intervening intermediate layers, wherein the first buffer (3, 13) is embodied as a single layer or as a multilayer system and includes, at least at the surface facing away from the carrier substrate (2, 12), arsenic (As) and at least one of the elements aluminum (Al) and indium (In).

Abstract: A phospholipid composition has a phosphatidylcholine and lysophosphatidylcholine content of at least 80% by weight and is substantially free from additives. The phospholipid composition is in granular form with the particle size between 18 mm and 0.07 mm. The phospholipid composition may be stored at low temperatures for extended periods of time.

Abstract: A phospholipid composition exhibiting a phosphatidylcholine content of at least 80% by weight is described. Whereby this pulverized or granulated composition is free from additives.In order to prepare such a phospholipid composition the phospholipid starting material is comminuted after cooling to a temperature below-50.degree. C.

Abstract: The invention refers to a novel method for the preparation of 8-hydroxyoctanoic acid by reaction of 6-chlorohexanol with a dialkyl malonate ester, thermal decarboxylation of the malonic acid derivative and isolation of the 8-hydroxyoctanoic acid as the free acid or as an alkali metal salt.

Abstract: The invention is related to a process for preparing highly pure Ebselen (2-phenyl-1.

Abstract: A process for isolating a phosphatidylcholine from vegetable lipid mixtures wherein the lipid mixture is dissolved in a solvent mixture of a low boiling petroleum ether fraction (40.degree.-80.degree. C.), a lower C.sub.1 -C.sub.4 -alkanol and water, the solution is introduced into a column filled with silica gel at a temperature in the range of 20.degree. to 50.degree. C., the elution is carried out at that temperature with the same solvent mixture and the main run is collected and a pure phosphatidylcholine free of other phospholipids present in the starting vegetable lipid mixture is isolated therefrom in a usual manner.

Abstract: The invention is related to a new process for producing imidazolylthiophenaldehydes of the general formula I ##STR1##