摘要:
There has been found 1) a method for reducing the toxicity of spent liquors from dyeing with cationic dyes or mixtures thereof, characterized by the step of dyeing with cationic dyes having a computed electrostatic shielding energy (idealized hydration energy) of .gtoreq.50 kcal/mol, 2) cationic, generally low toxicity dyes, their preparation and use for dyeing.
摘要:
There has been found1) a method for reducing the toxicity of spent liquors from dyeing with cationic dyes or mixtures thereof, characterized by the step of dyeing with cationic dyes having a computed electrostatic shielding energy (idealized hydration energy) of .gtoreq.50 kcal/mol,2) cationic, generally low toxicity dyes, their preparation and use for dyeing.
摘要:
A variety of diazacyanine mediators that are soluble in aqueous media and which do not inhibit enzymatic activity are provided for use on the surface of a working electrode of a electrochemical biosensor for electrochemical co-enzyme regeneration. The co-enzyme, dihydronicotinamide adenine dinucleotide (NADH) or dihydronicotinamide adenine dinucleotide phosphate (NADPH), is oxidized to NAD.sup.+ OR NADP.sup.+ which is reduced by an oxidoreductase such as a dehydrogenase acting on a substrate. By applying the mediator together with NADH or NADPH to the surface of the working electrode, the voltage necessary to achieve oxidation is substantially reduced. Biosensor electrodes such as graphite electrodes may be produced-by screen printing techniques.
摘要翻译:提供了可溶于水性介质并且不抑制酶活性的各种二氮芥酸介质用于电化学生物传感器用于电化学辅酶再生的工作电极的表面。 辅酶,二氢烟酰胺腺嘌呤二核苷酸(NADH)或二氢烟酰胺腺嘌呤二核苷酸磷酸(NADPH)被氧化成NAD + OR NADP +,其由氧化还原酶例如作用于底物的脱氢酶而还原。 通过将介体与NADH或NADPH一起施加到工作电极的表面,实现氧化所需的电压显着降低。 生物传感器电极如石墨电极可以通过丝网印刷技术制造。
摘要:
4,5-Dihydro-1H-1,2,3-triazolium compounds of the formula (I) ##STR1## in which R.sup.1 and R.sup.2 independently of one another denote C.sub.6 -C.sub.14 -aryl or a heterocyclic radical having up to 3 rings and up to 4 heteroatoms from the series consisting of O, S and N, R.sup.3 and R.sup.4 independently of one another denote hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.2 -C.sub.12 -alkenyl, C.sub.4 -C.sub.8 -cycloalkyl, C.sub.7 -C.sub.17 -aralkyl, C.sub.6 -C.sub.14 -aryl or nitrile or R.sup.3 and R.sup.4 together denote a 2- to 5-membered C bridge, which can optionally be interrupted by up to two oxygen and/or nitrogen atoms, and X.sup.- denotes an anion, wherein all the alkyl, alkenyl, cycloalkyl, aralkyl and aryl radicals and fused and heterocyclic radicals present can optionally be substituted by nonionic substituents, carboxyl groups, ammonium groups and/or pyridinium groups, are used as dyestuffs. New 4,5-dihydro-1H-1,2,3-triazolium compounds correspond to the formula (I), with the provisos that if R.sup.3 and R.sup.4 in each case denote hydrogen then in the case where R.sup.1 =4-methylphenyl R.sup.2 does not represent 4-nitrophenyl, 4-methoxyphenyl or phenyl and R.sup.1 and R.sup.2 do not both simultaneously represent 4-methylphenyl, 4-nitrophenyl, 4-methoxyphenyl or phenyl.
摘要:
The cycloalkano-pyridines are prepared by reacting corresponding cycloalkano-pyridine-aldehydes with suitable organometallic compounds or Wittig or Grignard reagents or reacting compounds of the cycloalkano-pyridine alcohols type with suitable bromine compounds, and optionally varying the functional groups accordingly. The, cycloalkanopyridines are suitable as active compounds in medicaments, in particular in medicaments for the treatment of hyperlipoproteinaemia and arteriosclerosis.
摘要:
The present invention provides a process for preparing (4-nitroso-phenyl)phenyl-hydroxylamine which is characterized in that nitrobenzene is reacted in the presence of hydroxide and/or oxide-containing bases, optionally in the presence of solvents, at temperatures of 20 to 180.degree. C. and pressures of 0.1 to 10 bar.The process according to the invention has the particular advantage that it uses inexpensive and cost-effective nitrobenzene as starting material instead of the nitrosobenzene conventionally used hitherto.
摘要:
The invention provides a process for preparing 4-aminodiphenylamine, an important starting product for synthesizing antioxidants and stabilizers in the rubber and polymer industry, by hydrogenating nitrosobenzene with hydrogen in the presence of a proton acid as catalyst and in the presence of a hydrogenating catalyst, optionally in the presence of an inert organic solvent and thermally decomposing the 4-ADPA ammonium salt produced in this way, wherein 4-ADPA is obtained. 4-aminodiphenylamine is produced in good yields and high purity by the process according to the present invention. Furthermore, no effluent is produced, which makes the process particularly economic and ecological.
摘要:
The present invention relates to the production of aminodiphenyl-amines resulting in good yields and high purity levels when aromatic amines are reacted with nitrohalobenzenes in the presence of a palladium catalyst and a base and the product thus obtained is subsequently hydrogenated with hydrogen.
摘要:
The invention relates to a process for the preparation of nitrosobenzenes from aromatic amines by oxidation with hydrogen peroxide in the presence of sodium molybdate dihydrate and an inert organic solvent.
摘要:
The invention relates to a process for the preparation of nitrodiphenylamines by reaction of nitrohalogenobenzenes with aromatic amines in the presence of a palladium catalyst and a base, the base being ground and/or dried before its use.