摘要:
The present invention relates to a process for the preparation of optically active alcohols from ketones with the aid of whole-cell catalysts comprising an alcohol dehydrogenase and also an enzyme capable of cofactor regeneration, a substrate concentration of at least 500 mM of ketone being provided for the conversion and the conversion being carried out without the addition of an "external" cofactor.
摘要:
The present invention relates to specific E. coli mutants which can be used for the synthesis of D-amino acids, and to such a process. The mutants are distinguished by deficiencies in particular enzymes which break down D-amino acids.
摘要:
Known acetylation processes for producing N-acetyl-D,L- alpha -aminocarboxylic acids from the corresponding D,L- alpha -aminocarboxylic acids by acetylation with acetic anhydride in acetic acid and isolation of the resulting N-acetyl-D,L- alpha -aminocarboxylic acids from the acetylation mixture either result in the production of large quantities of salts or require an aqueous treatment to isolate the N-acetylated alpha -amino acids in sufficiently pure form. By carrying out the acetylation at 60-150 DEG C in a concentration of
摘要:
Compounds of formula (I), and their N-oxides and agriculturally suitable salts, are disclosed which are useful for controlling undesired vegetation. In said formula (I) J is J-1 - J-19, R is C1-C6 alkoxy, C1-C6 haloalkoxy, C1-C6 haloalkyl, C3-C6 cycloalkyl, C3-C6 halocycloalkyl, C2-C6 alkoxyalkyl, C2-C6 haloalkoxyalkyl, C2-C6 alkenyl, C2-C6 haloalkenyl, C3-C6 alkoxyalkenyl, C2-C6 alkynyl, C2-C6 haloalkynyl, C2-C6 cyanoalkyl, C1-C6 nitroalkyl, (CH2)p-OR , CH=CH(CH2)q-OR , CC(CH2)q-OR , C2-C6 alkylthioalkyl, C2-C6 alkylsulfinylalkyl, C2-C6 alkylsulfonylalkyl, C3-C8 alkoxycarbonylalkyl, C3-C8 alkylcarbonyloxyalkyl or oxiranyl optionally substituted with 1-3 C1-C3 alkyl; also disclosed are compositions containing the compounds of formula (I) and a method for controlling undesired vegetation which involves contacting the vegetation or its environment with an effective amount of a compound of formula (I).
摘要:
Disclosed is a process for producing beta -amino- alpha -hydroxycarboxylic acid derivatives of general formula (2R,3S)- or (2S,3R)-N-(X,Y)-3-amino-2-hydroxy-3-phenyl-propionic acid-Z of formula (I), e.g. of (2R,3S)-3-amino-2-hydroxy-3-phenyl-propionic acid or (2R,3S)-N-benzoyl-3-amino-2-hydroxy-3-phenyl-propionic acid methylester. Compounds of type I are valuable intermediates in the total synthesis of taxols which can be used in the treatment of various forms of cancer.
摘要:
The invention concerns a method of producing oxazolidinones of formula (I), wherein R - R have the meanings given in the description, by reacting cyclical anhydrides of formula (II) with carbonyl compounds of general formula (III) at temperatures between ambient temperature and approximately 150 DEG C. The invention also concerns the production of the cyclical anhydrides of formula (II) by reacting N-protected aminodicarboxylic acids of formula (IV) with a dehydrating agent in situ. The invention further concerns the use of oxazolidinones of formula (I) for the alpha -selective production of esters of formula (V) and amides of general formula (VII).
摘要:
A process for producing 2-[3(S)-amino-2-(R)-hydroxyl-4-phenyl butyl]-N-tert.butyl decahydro-(4aS, 8aS)-isoquinoline-e(S)-carboxamide of the formula (I) via 3(S)-[lower alkoxy carbonyl amino, phenoxy carbonyl amino or benzyl oxycarbonyl amino]-2-hydroxy-4-phenyl butyric acid and process for producing said acid.
摘要:
Heterocyclic compounds are disclosed. Herbicidal compounds are to act in the smallest possible doses with high selectivity between useful plants and weeds. The object of the invention is to make available new chemical compounds capable of being used as herbicides. The new heterocyclic compounds have the formula (I), in which X stands for O, S, CH2 or substituted CH2 and Q stands for substituted benzols. These compounds may be provided for example in a preparation containing surface-active agents and solid or liquid diluents for controlling the growth of undesirable vegetation. Herbicidal active substances are disclosed.
摘要:
The invention relates to a food supplement which can contain at least one amino acid, wherein the food supplement is otherwise essentially nitrogen-free and contains at least one alpha-keto acid selected from the group alpha-ketoisocaproate, alpha-ketoisovalerate and alpha-keto-beta-methylvalerate and/or a salt of these alpha-keto acids. The food supplements described support muscle build-up and simultaneously relieve metabolism in nitrogen detoxification by reduced nitrogen supply and improve nitrogen retention in the body.
摘要:
The present invention relates to an oscillatory flow mixing reactor (OPM) oscillatory flow which is designed so that a flow with angular momentum is superposed by means effecting circular acceleration on the mixture flowing in with oscillation, with the result that good mixing of the individual phases of the mixture is achieved with the use of low shear forces. A use of the reactor according to the invention is also disclosed.