摘要:
A stereoselective method for making compounds of Formula VIII ##STR1## wherein A and * are as defined in the specification. Enzymic processes and intermediates useful for preparing compound of Formula VIII are disclosed.
摘要:
A mesomorphic compound represented by the formula: ##STR1## wherein R.sub.1 denotes an alkyl group having 1-16 carbon atoms; R.sub.2 denotes an alkyl group having 2-10 carbon atoms; X denotes a single bond or --O--; Y denotes --OCH.sub.2 --, ##STR2## Z denotes a single bond, ##STR3## respectively and independently denote ##STR4## k, l and n are respectively 0, 1 or 2 satisfying the relation of k+l+n=2 or 3; C* denotes an asymmetric carbon atom. The mesomorphic compound, when added as a component, provides a liquid crystal composition showing an improved field respective characteristic or is effective in preventing occurrence of a reverse domain.
摘要:
Glycerol and aliphatic nitriles are simultaneously produced by treating liquid glycerides with gaseous ammonia at a rate of at least 200 liters of ammonia per kilogram of glyceride per hour at temperatures of from 220.degree. to 300.degree. C. in the presence of metal salts of carboxylic or sulfonic acids as catalysts and subjecting the product mixture to a phase separation into a nitrile phase and a glycerol/water phase. Preferred starting materials are vegetable and animal fats and oils.
摘要:
Phenylacetic acid derivatives of the formula I ##STR1## where the substituents and the index have the following meanings: X is oxygen or sulfur;R is hydrogen or alkyl;R.sup.1 is hydrogen or alkyl;R.sup.2 is cyano, nitro, trifluoromethyl, halogen, alkyl or alkoxy;m is 0, 1 or 2, it being possible for the R.sup.2 radicals to be different if m is 2;R.sup.3 is hydrogen, cyano, nitro, hydroxyl, amino, halogen, alkyl, haloalkyl, alkoxy, haloalkoxy, alkylthio, alkylamino or dialkylamino;R.sub.4 is hydrogen, cyano, nitro, hydroxyl, amino, halogen,unsubstituted or substituted alkyl, alkoxy, alkylthio, alkylamino, dialkylamino, alkenyl, alkenyloxy, alkenylthio, alkenylamino, N-alkenyl-N-alkylamino, alkynyl, alkynyloxy, alkynylthio, alkynylamino, N-alkynyl-N-alkylamino;unsubstituted or substituted cycloalkyl, cycloalkoxy, cycloalkylthio, cycloalkylamino, N-cycloalkyl-N-alkylamino, cycloalkenyl, cycloalkenyloxy, cycloalkenylthio, cycloalkenylamino, N-cycloalkenyl-N-alkylamino, heterocyclyl, heterocyclyloxcy, heterocyclylthio, heterocyclylamino, N-heterocyclyl-N-alkylamino, aryl, aryloxy, arylthio, arylamino, N-aryl-N-alkylamino, hetaryl, hetaryloxy, hetarylthio, hetarylamino, N-hetaryl-N-alkylamino;R.sup.5 is hydrogen,unsubstituted or substituted alkyl, cycloalkyl, alkenyl, alkynyl, alkylcarbonyl, alkenylcarbonyl, alkynylcarbonyl or alkylsulfonyl;unsubstituted or substituted aryl, arylcarbonyl, arylsulfonyl, hetaryl, hetarylcarbonyl or hetarylsulfonyl,and their salts, processes and intermediates for their preparation, and their use are described.
摘要:
Novel substituted benzamides of the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and A are as defined herein are useful in the treatment of emesis, and particularly chemotherapy-induced emesis in cancer patients. Some of the compounds are also useful in disorders relating to impaired gastric motility.
摘要:
The present invention provides a labelled .beta.-cyano-L-alanine and a .gamma.-cyano-.alpha.-aminobutyric acid, of which cyano group carbon is labelled with radionuclide .sup.11 C or .sup.14 C, or stable isotope .sup.13 C. The present invention also provides a labelled amino acids such as asparagine, asparatic acid, DABA, GABA, glutamine and glutamic acid synthesized by using the labelled .beta.-cyano-L-alanine and the .gamma.-cyano-.alpha.-aminobutyric acid as an intermediate. The labelled amino acids are useful for in vivo imaging of tumors and brain functions.
摘要:
Achiral fluorine-containing liquid crystal compounds are provided. The compounds comprise a fluorocarbon terminal portion and a hydrocarbon or another fluorocarbon terminal portion, the terminal portions being connected by a central core, the compounds having smectic mesophases or having latent smectic mesophases. The compounds are useful in liquid crystal display devices both along and in mixtures with other materials. Also provided is a process for preparing these compounds.
摘要:
Difluoromethylene compounds of the formula IR.sup.1 --(A.sup.1 --Z.sup.1).sub.m --A.sup.2 --Q--CF.sub.2 --(A.sup.3 --Z.sup.2).sub.n --A.sup.4 --R.sup.2 Iin which R.sup.1, R.sup.2, A.sup.1, A.sup.2, A.sup.3, A.sup.4, Z.sup.1, Z.sup.2, m and n are as defined herein and Q is --CO--, --O-- or --S--, can be used as components of liquid-crystalline media for liquid-crystal and electrooptical display elements.