Abstract:
The present invention relates to a method for purifying naproxcinod comprising the steps of : a) dissolving or dispersing a mixture containing naproxcinod in an amount higher than 90% by weight in a solvent; b) cooling the solution or two phases dispersion under stirring to a temperature ranging from -20°C to 10°C c) optionally seeding the solution with crystals of naproxcinod d) stirring, by maintaining the temperature in the range from - 40°C to 1O°C e) collecting the formed solid by maintaining the temperature under 15°C A further object of the invention is a crystalline form of naproxcinod.
Abstract:
The invention relates to a method for the production of liquid nitrate esters, e.g. nitro-glycerine, wherein an alcohol is esterified by means of nitrating acid and the reaction takes place in one or several microreactors.
Abstract:
A process for the preparation of compounds of formula: HO-A-ONO 2 (I) wherein A is a C 2 -C 6 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:
A process for the preparation of nitro compounds by reacting an organic substrate with nitrogen dioxide either in the presence of oxygen or under such conditions that the nitrogen dioxide/organic substrate ratio is less than 1 by mole. The reaction may be conducted in the presence of an imide compound such as N-hydroxyphthalimide and the organic substrate includes (a) aliphatic hydrocarbons, (b) alicyclic hydrocarbons, (c) nonaromatic heterocyclic compounds having ring-constituent carbon atoms bonded to hydrogen atoms, (d) compounds bearing aromatic rings and carbon-hydrogen bonds adjacent to the rings, (e) carbonyl compounds bearing carbon-hydrogen bonds adjacent to the carbonyl groups, and so on. This process enables efficient nitration of organic substrates even under relatively mild conditions.
Abstract:
The present invention relates to a process for preparing nitrooxy esters, nitrooxy thioesters, nitrooxy carbonates and nitrooxy thiocarbonates of compounds having at least an hydroxyl or thiol functional group, according to the following reaction scheme The invention also relates to intermediates useful in said process and to their preparation.
Abstract:
The present invention refers to a process for preparing a compound of general formula (A), as reported in the description, wherein R is a radical of a drug and R1-R12 are hydrogen or alkyl groups, m, n, o, q, r and s are each independently an integer from 0 to 6, and p is 0 or 1, and X is O, S, SO, SO2, NR13 or PR13 or an aryl, heteroaryl group, said process comprising reacting a compound of formula (B) R—COOZ (B) wherein R is as defined above and Z is hydrogen or a cation selected from: Li+, Na+, K+, Ca++, Mg++, tetralkylammonium, tetralkylphosphonium, with a compound of formula (C), as reported in the description, wherein R1-R12 and m, n, o, p, q, r, s are as defined above and Y is a suitable leaving group.
Abstract:
A process for obtaining (nitroxymethyl)phenyl esters of salicylic acid derivatives of formula (I) wherein R1 is the OCOR3 group characterized in that it comprises the following steps: a) reaction of a halide of a salicylic acid derivative with hydroxybenzylacohol in the presence of a base: b) nutration of the obtained product in anhydrous conditions by a mixture of nitric acid with a different inorganic acid, or an organic acid, or an anhydride of one or two organic acids: c) recovery of the final product.
Abstract:
Process for the production of a chemical compound from a carbon dioxide starting material, comprising the steps of a) providing a feed stream consisting mainly of carbon dioxide; b) electrolysing in an electrolysis stage the carbon dioxide in the feed stream to a first gas stream containing carbon monoxide and a second gas stream containing oxygen, wherein the molar ratio between carbon monoxide and oxygen is about 1:0.5 in an electrolysis stage; c) adjusting the composition of the first gas stream or the second gas stream or both gas streams to include carbon dioxide, either by operating at less than full conversion of CO 2 or by sweeping one or both gas streams with a gas containing CO 2 or by at some stage between the electrolysis cell and the oxidative carbonylation reactor diluting one or both gas streams with a gas containing CO 2 ; all while maintaining an overall molar ratio of carbon monoxide to oxygen of about 1:0.5; and d) introducing the first and second process stream into a reaction stage and reacting the first and second process stream combined or in succession with a substrate to the chemical compound by means of an oxidative carbonylation reaction with the carbon monoxide and oxygen contained in the process feed stream.