Abstract:
This invention relates to a new process for preparing 4-nitro-oxy-methyl- benzoic acid, comprising the following steps: a) reaction of 4-chloromethyl-benzoic acid with silver nitrate and in the presence of an acid as a catalyst in acetonitrile at reflux temperature, followed by cooling and adding of a polar aprotic solvent; b) separation of the silver salts by filtration, followed by washout with a polar aprotic solvent; c) precipitation of the 4-nitro-oxy-methyl-benzoic acid with water from the filtrate obtained in step b); and d) drying of the 4-nitro-oxy-methyl-benzoic acid.
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 10°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 present invention relates to a process for preparing nitrooxy esters, nitrooxy thioesters, nitrooxy carbonates and nitrooxy thiocarbonates of compounds having at least a hydroxyl or thiol functional group, according to the following reaction scheme, (I), (II), (III). The invention also relates to intermediates useful in said process and to their preparation.
Abstract:
Beschrieben wird ein Verfahren zur Herstellung von flüssigen Nitratestern, z.B. Nitroglycerin, bei dem ein Alkohol mittels Nitriersäure verestert wird, wobei die Reaktion in einem oder mehreren Mikroreaktoren durchgeführt wird.
Abstract:
A process for the purification of 1,4-butanediol mononitrate from 1,4-butanediol dinitrate and 1,4-butanediol, by selective extraction with solvents is herein disclosed.
Abstract:
The present invention refers to a process for preparing a compound of general formula (A), wherein R is a radical of naproxen or bromonaproxen and R 1 -R 12 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, SO 2 , NR 13 or PR 13 or an aryl, heteroaryl group, said process comprising reacting a compound of formula (B) : R-COOZ 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 preparing 1,2- and 1,3-dinitrate esters from polyols containing 1,2- or 1,3-diol fragments involves using an alkyl or aryl boronic acid to form a cyclic boronate ester derivative which is then reacted with dinitrogen pentoxide to directly generate the dinitrate ester. In the cyclic ester form the 1,2- or 1,3-hydroxyl groups are protected and other reactions may then be carried out on other parts of the molecule of which the fragment forms a part, leaving the dinitrate ester to be produced subsequently in the final step. High yields are obtained at both stages.
Abstract in simplified Chinese:本发明系关于一种制备4-硝基-氧基-甲基-苯甲酸之新颖方法,其包含以下步骤:a)在回流温度下在乙腈中在酸作为催化剂存在下,使4-氯甲基-苯甲酸与硝酸银反应,随后冷却且添加极性非质子性溶剂;b)借由过滤分离银盐,随后用极性非质子性溶剂冲洗;c)用水自步骤b)中获得之滤液中沉淀4-硝基-氧基-甲基-苯甲酸;及d)使4-硝基-氧基-甲基-苯甲酸干燥。
Abstract in simplified Chinese:本发明系关于从二氧化碳起始物质制造化学化合物之方法,其包括以下步骤a)提供主要由二氧化碳组成之进料流;b)在电解阶段将该进料流之二氧化碳电解成含有一氧化碳之第一气流及含有氧气之第二气流,其中在电解阶段,一氧化碳与氧气之间的莫耳比为约1:0.5;c)如下调节该第一气流或该第二气流或两个气流之组成以包含二氧化碳:在小于CO2完全转化下操作,或用含有CO2之气体吹扫一或两个气流,或在电解池与氧化羰基化反应器之间的某一阶段用含有CO2之气体稀释一或两个气流;所有均同时维持约1:0.5之一氧化碳与氧气之总莫耳比;及d)将该第一及第二方法流引入该反应阶段,且使组合或连续之该第一及第二方法流与基质反应得到该化学化合物,其借助于与该方法进料流中所含之该一氧化碳及氧气进行氧化羰基化反应来达成。