Abstract:
A process for producing a bis(4-hydroxy-3-nitrophenyl) compound, characterized in that a bis(4-hydroxyphenyl) compound comprising two phenyl groups bonded to each other directly or through an electron-donating bridging group, sulfoxide group, sulfone group, or carbonyl group is nitrated with nitric acid in an inert solvent substantially in the absence of any other acid. By the process, the target compound reduced in the content of trinitro-substituted compounds can be produced in high yield. Recrystallizing the compound easily gives in high yield a high-purity product suitable for use as a raw material for a heat-resistant polymer, etc., because the content of trinitro-substituted compounds in that compound is low.
Abstract:
Disclosed herein is an improvement in a method for making compounds having the structural formulae (I) or (II) wherein: X is a) phenyl; lower phenylalkoxy, phenoxy; or benzyl; or b) one subtituent from group a) and one or more substituents selected from C1-C4 alkoxy; hydroxyl; halogen; lower alkyl; and lower alkylthio; or c) along with the phenyl to which it is attached, forms a multiple fused ring heterocycle such as dibenzofuranyl; Y is H, C1-C4 alkanoyl, C1-C4 haloalkanoyl, dialkoxyphosphoryl, alkylaminocarbonyl, haloalkylsulfonyl, or C1-C4 alkoxy carbonyl; and R is H, C1-C6 alkyl, C1-C6 alkoxy, C3-C6 cycloalkoxy, haloalkyl, alkoxyalkyl, arylalkoxy, alkenyl, alkylthio, alkoxycarbonyl, alkylamino, heteroaryl, arylalkyl, haloalkoxy, aryloxy, or C3-C6 cycloalkyl; and Z is O or S, wherein the improvement comprises the steps of: A) selecting as a starting material a compound of structural formula (III); B) dissolving compound III in an organic solvent selected from the group consisting of methyl t-butyl ether, ethylene glycol dimethyl ether, 2-methoxyethyl ether, acetonitrile, and acetic acid, and C) nitrating with nitric acid to form a compound of structural formula (IV).
Abstract:
Disclosed herein are compounds related to tolcapone and its metabolite, 3-OMT, along with 3-deoxytolcapone, as well as pharmaceutical compositions comprising the same. Also disclosed are methods of using such compounds and compositions, including use for the treatment or prevention of amyloid-associated diseases or disorders.
Abstract:
The present invention relates to an improved, cost effective, eco-friendly and easy t handle process to manufacture substantially pure form of (2E)-2-Cyano-3-(3,4-dihydroxy-5 nitrophenyl)-N,N-diethyl-2-propenamide or (E)- N,N-diethyl-2-cyano-3-(3,4-dihyroxy-5 nitroρhenyl)-acrylamide polymorphic form A commonly known as (E)-Entacapone represente by Formula I, using ammonium acetate as a base.
Abstract:
Metal complexes which serve as catalysts in various chemical reactions or as materials in the information-electronics industry, exhibit peroxidase-like activities or high hydrolytic activities for phosphoric diesters, and can easily hybridize with base sequence recognition sites; and novel analytical methods for hydrogen peroxide with the complexes exhibiting peroxidase-like activities. The above metal complexes are prepared by bringing a cyclic phenol sulfide represented by general formula (2) into contact with at least one member selected from among Group 8, 1A to 7A, 1B and 3B metals, and are usable as catalysts for the oxidation with hydrogen peroxide or those for the hydrolysis of phosphoric diesters, the hydrolysis catalysts being useful also in the analysis for hydrogen peroxide. In said formula X is hydrogen, a hydrocarbon group or the like; Y is hydrogen, a hydrocarbon group or the like; Z is Sm or the like; m is an integer of 1 to 7; and n is an integer of 4 to 8.
Abstract translation:在各种化学反应中作为催化剂的金属络合物或作为信息电子工业的材料,对磷酸二酯显示过氧化物酶样活性或高水解活性,并且可以容易地与碱基序列识别位点杂交; 和具有过氧化物酶样活性的复合物的过氧化氢的新型分析方法。 通过使由通式(2)表示的环状苯酚硫化物与选自第8类,第1A类,第7A类,第1B类和第3B族金属中的至少一种物质接触来制备上述金属络合物,并且可用作用于氧化的催化剂 过氧化氢或用于水解磷酸二酯的那些,水解催化剂也用于分析过氧化氢。 在所述式中,X 1是氢,烃基等; Y 1是氢,烃基等; Z 1是Sm 1等; m 1为1〜7的整数, n 1为4〜8的整数。
Abstract:
Compounds and methods of treating or preventing a Flavivirus infection in a subject are provided. The methods comprise administering to the subject a therapeutically effective amount of a compound as described herein. The methods are useful in treating and/or preventing Flavivirus infections such as, for example, West Nile Virus, Dengue Virus, and Japanese Encephalitis Virus. Methods of inhibiting a Flavivirus protease in a cell are also provided.
Abstract:
This invention relates to processes for making nitro compounds derived from C 2 -C 30 unsaturated fatty acids; C 2 -C 30 unsaturated fatty oils; esters derived from the reaction of C 1 -C 20 alcohols with unsaturated C 2 -C 30 fatty acids; C 2 -C 20 polyolefins; C 4 -C 20 polydiolefins; C 8 -C 20 copolymers derived from polyolefins and vinyl aromatics; and C 4 -C 30 alkylated phenols using nitric acid or gaseous nitrogen dioxide. This class of extreme-pressure additives was found extremely effective in processing steel, stainless steel and special titanium and nickel or low-iron alloys.
Abstract:
La présente invention a pour objet un procédé de préparation d'un nitrophénol de haute pureté, et plus particulièrement du p-nitrophénol. L'invention concerne un procédé de préparation d'un nitrophénol à partir d'un nitrohalogénobenzène qui consiste à effectuer:- (a) une hydrolyse d'un composé nitrohalogénobenzène par réaction dudit composé avec une base,- (b) une acidification pour obtenir le composé nitrophénol à partir de son sel, par un traitement acide,- (c) une cristallisation du composé nitrophénol obtenu,- (d) une séparation du produit obtenu,caractérisé par le fait qu'il comprend aussi au moins les étapes suivantes:- (e) une concentration du milieu réactionnel après hydrolyse (a) et avant acidification (b),- (f) une décantation liquide/liquide effectuée après acidification (b) et avant cristallisation (c) et destinée à éliminer la phase aqueuse obtenue après acidification (b).
Abstract:
The invention relates to a method for producing 4-hydroxy-3-nitrobiphenyl on the basis of 4-hydroxybiphenyl by highly selective and effective nitration in the vicinal position to the phenolic hydroxy group, whereby the azotic acid used as the nitration reagent is added to the reaction system in a specific manner.