Abstract: The invention relates to cosmetic and/or dermatological preparations which contain, in part, novel catechol oximes of formula (I). Said preparations can promote, in physiological systems, the natural defense mechanisms against free radicals and reactive oxygen compounds, or can be used as protective agents in cosmetic or pharmaceutical products whose oxidation-sensitive constituents should be protected from autooxidation.

Abstract: The present invention relates to a new highly selective process for the preparation of enantiomerically pure halogeno-phenyl-substituted 1,4-dihydropyridine-3,5-dicarboxylic esters of the general formula (I) ##STR1## in which R.sup.1 to R.sup.3 have the meanings given in the description.

Abstract: The present invention relates to a new highly selective process for the preparation of enantiomerically pure halogeno-phenyl-substituted 1,4-dihydropyridine-3,5-dicarboxylic esters of the general formula (I) ##STR1## in which R.sup.1 to R.sup.3 have the meanings given in the description.

Abstract: This invention relates to benzolididene compounds of the formula ##STR1## in which R.sup.2 represents the radical ##STR2## in which R.sup.4 and R.sup.5 are identical or different and denote halogen, cyano, ethinyl, trifluoromethoxy, methylthio, nitro, trifluoromethyl or straight-chain or branched alkyl, alkenyl, alkinyl or alkoxy having up to 4 carbon atoms, and one of the substituents optionally represents hydrogen,or a salt thereof.

Abstract: Optically active oxiranes of the formula ##STR1## in which R represents substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl or represents substituted or unsubstituted phenyl, andR.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 represent hydrogen or alkyl, at least one of the radicals representing alkyl, orR.sup.4 and R.sup.5 together represent alkanediyl, which is unsubstituted or substituted by alkyl, or R.sup.4 and R.sup.5 together with the adjacent carbon atoms represent a fused bicyclic hydrocarbon radical, which is unsubstituted or substituted by alkylare produced by reacting an enantiomerically pure oxathiane ketone of the formula ##STR2## with a sulphonium or sulphoxonium salt.

Abstract: A new process for the preparation of an optically active 2-hydroxyethyl-azole derivative of the formula ##STR1##

Abstract: Process for inverting the configuration of secondary alcohols in which the hydroxyl group is attached to an asymmetric carbon atom, in accordance with which the secondary alcohols are esterified, with inversion of their configuration, by conversion into isourea ethers and reaction of these isourea ethers with carboxylic acids, and the esters are then saponified with retention of the configuration of the secondary alcohols.

Abstract: This invention relates to benzolididene compounds of the formula ##STR1## in which R.sup.2 represents the radical ##STR2## in which R.sup.4 and R.sup.5 are identical or different and denote halogen, cyano, ethinyl, trifluoromethoxy, methylthio, nitro, trifluoromethyl or straight-chain or branched alkyl, alkenyl, alkinyl or alkoxy having up to 4 carbon atoms, and one of the substituents optionally represents hydrogen,or a salt thereof.[...]..Iadd., andA represents hydrogen or straight-chain or branched alkyl having up to 8 carbon atoms, or represents phenyl or benzyl which are optionally substituted one to three times by identical or different substituents from the series consisting of hydroxyl, nitro, halogen, cyano, carboxyl, trifluoromethyl, trifluoromethoxy, straight-chain or branched alkoxy having up to 6 carbon atoms or by a group of the formula --NR.sup.6 R.sup.7 or --SO.sub.2 R.sup.8, in whichR.sup.6 and R.sup.