摘要:
The present invention relates to novel 2-arylpropenoic acids, derivatives thereof, processes for their preparation and their use in the preparation of S-ketoprofen.
摘要:
The invention relates to new optically active amino acid derivatives of the general formula (I) ##STR1## in which n, R, R.sub.1, R.sub.2, R.sub.3, X and A have the meaning given in the description, which amino acid derivatives contain sulphoxide or sulphone groups, to two basic synthetic routes for the preparation from sulphur-containing amino acids, to the polymerization of these monomers and to the use of the polymers as optically active adsorbents for chromatographic resolution of racemates to give the enantiomers.
摘要:
The invention relates to new optically active sulphur-containing amino acid derivatives, a process for their preparation, their polymerisation to give optically active polymers and the use of these optically active polymers as adsorbents for chromatographic separation of racemates into enantiomers.
摘要:
A method of combating pests which comprises applying to such pests or to a pest habitat a pesticidally effective amouht of a substituted 2-cyclohexen-1-yl-amine derivative of the formula ##STR1## and addition products thereof with acids and metal salts. Most of the compounds are new.
摘要:
Low-melting polymers containing at least one Z-configured stilbene group are produced by reaction of Z-configured bifunctional stilbene compounds with bifunctional monomers, oligomers or relatively high molecular weight components at temperatures in the range from -30.degree. to 250.degree. C., optionally in the presence of organic solvents and/or diluents and/or catalysts, the Z-configuration of the stilbene units remaining intact. The low-melting polymers may be processed by standard methods to moldings of various kinds which may be converted by treatment of temperatures of 250.degree. to 500.degree. C. and/or by irradiation at wavelengths of 200 to 800 nm into high-melting plastics articles of high heat resistance.
摘要:
Polyester and polyester carbonates corresponding to the following formula ##STR1## in which R.sup.1 to R.sup.4, o to r, n, a and b and also X.sup.1 and Y.sup.1 are as defined in the specification,may be obtained by interfacial condensation from bisphenols corresponding to the following formula. ##STR2## aromatic dicarboxylic acid chlorides corresponding to the following formula ##STR3## and phosgene. The new polyesters and polyester carbonates combine outstanding heat resistance and light stability. They may be used both as thermoplastic materials as such or as constituents of polymer blends or even as UV (light) stabilizers or as UV (light)-stabilizing coatings. Accordingly, they have degrees of polycondensation n in the range from 2 to 100.
摘要:
Phenylketones etherified in the 4-position can be prepared by reaction of aromatic ethers which have a free 4-position with acylating agents, the acylation being carried out in the presence of zeolite catalysts having pore sizes of at least 5 .ANG..
摘要:
The invention relates to optically active homo- and copolymers made from optically active (meth)acrylamides, the polymers being immobilized on silica gel, a process for their preparation, and their use as adsorbents, in particular as the stationary phase for chromatographic racemate resolution.