Abstract:
A process for the preparation of compounds of formula HO-A-ONO2 (I) wherein A is a C2-C6 alkylene chain by nitration of the corresponding alkanediols with “stabilised” nitric acid is herein disclosed. The process is safer to operators and allows to obtain advantageous yields on an industrial scale.
Abstract:
The present invention relates to a new process for the preparation of NO-donating compounds using a sulfonated intermediate. The invention relates to new intermediates prepared therein suitable for large scale manufacturing of NO-donating compounds. The invention further relates to the use of the new intermediates for the manufacturing of pharmaceutically active NO-donating compounds. The invention further relates to a substantially crystalline form of NO-donating NSAIDs, especially 2-[2-(nitrooxy)ethoxy]ethyl {2-[(2,6-dichlorophenyl)amino]phenyl}acetate, the preparation thereof and to pharmaceutical formulations containing said crystalline form and to the use of said crystalline form in the preparation of a medicament.
Abstract:
Fluoronitrobenzenes are prepared in an advantageous way from the corresponding chloronitrobenzenes and an alkali metal fluoride by means of a chlorine-fluorine exchange reaction with replacement of a chlorine atom by a fluorine atom, by catalyzing the reaction with a quaternaryammonium compound which comprises at least one alkoxypolyoxyalkyl radical.
Abstract:
The process of the present invention provides a method of obtaining a high yield of water or acid soluble nitrate esters without the use of organic solvents in the nitration reaction or the production of unstable products or by-products. The process involves the nitration of an organic hydroxy-containing compound with a suitable nitrating agent such as nitric acid in the absence of organic solvents in the nitration reaction. The reaction mixture is neutralized, causing the nitrate esters to precipitate or separate from the neutralized nitrate solution. The nitrate ester is then recovered, and any dissolved nitrate salts can be removed therefrom by gentle washing with water or a dilute halide solution. As provided by the process of the present invention, no organic solvents are used in the nitration reaction and average yields range from about 80% to about 95%.
Abstract:
A process for the production of a high energy material involves reacting, in an inert organic solvent, a heterocyclic compound selected from oxirane, aziridine, oxetane or azetidine with a nitrogen oxide selected from dinitrogen tetroxide (N.sub.2 O.sub.4) and dinitrogen pentoxide (N.sub.2 O.sub.5) and, when the nitrogen oxide is N.sub.2 O.sub.4, oxidizing the O- or N- nitroso substituent or substituents in the product obtained to O- or N- nitro substituent or substituents. The heterocyclic compounds may be substituents or unsubstituted. In the former case the preferred substituents groups are halogen, alkyl, alkenyl, nitro and epoxy (as in epoxidized polybutadiene). The solvent is preferably a chlorinated alkane.Novel nitrated derivatives of polybutadiene, in which between 1% and 25% of the carbon atoms in the polymer are substituted by nitrate (ONO.sub.2), are also provided. These novel materials are liquid rubbers when the polybutadiene starting material has a molecular weight between 2000 and 10000.
Abstract translation:用于生产高能材料的方法包括在惰性有机溶剂中使选自环氧乙烷,氮丙啶,氧杂环丁烷或氮杂环丁烷的杂环化合物与选自四氧化二氮(N 2 O 4)和五氧化二氮(N 2 O 5)的氮氧化物反应, 当氮氧化物是N 2 O 4时,将获得的产物中的O-或N-亚硝基取代基或取代基氧化成O-或N-硝基取代基。 杂环化合物可以是取代基或未取代的。 在前一种情况下,优选的取代基是卤素,烷基,烯基,硝基和环氧基(如在环氧化的聚丁二烯中)。 溶剂优选为氯化烷烃。 还提供了聚合物中1%至25%的碳原子被硝酸(ONO 2)取代的聚丁二烯的新型硝化衍生物。 当聚丁二烯起始材料的分子量在2000和10000之间时,这些新型材料是液体橡胶。
Abstract:
Organic nitrogen compounds are formed in the vapor phase by organic radical formation by reaction of an organic compound, suitably an alkane, with hydroxyl radicals derived from the reaction between hydrogen peroxide and nitrogen dioxide and the nitration of the organic radicals, suitably with nitrogen dioxide. The process is conducted using a molecular oxygen additive which directs the reaction towards the formation of the nitrate corresponding to the organic compound which may predominate in the organic reaction products.
Abstract:
In a process for the preparation of mononitrochlorobenzene by nitration of chlorobenzene using a mixed acid of nitric acid and phosphoric acid, the nitration reaction is carried out by using a molar ratio of nitric acid to chlorobenzene of not more than equimol in the presence of a concentrated phosphoric acid as the phosphoric acid component at temperatures of 50.degree.-120.degree. C. while maintaining the concentration of phosphoric acid to 72.4 weight % as P.sub.2 O.sub.5 or more during the reaction.
Abstract:
A PROCESS IS PROVIDED RO REACTING TWO OR MORE CHEMICAL REACTANTS IN WHICH THE REACTANTS ARE DISPERSED, UNDER TURBULENT MIXING CONDITIONS, IN AN INERT LIQUID CARRIER WHICH IS ESSENTIALLY A NON-SOLVENT FOR THE REACTANTS AND THEN REACTED AT A TEMPERATURE BELOW THE BOILING POINT OF THE LIQUID CARRIER WHILE THE TUBULENT CONDITIONS ARE MAINTAINED.