Abstract:
The present invention provides a process for nitrating aromatic compounds without the need for a solid catalyst and/or any organic solvents and/or any other additives. A typical process includes combining or admixing a nitric acid and an anhydride compound under conditions sufficient to produce a reactive intermediate. The aromatic compound to be nitrated is then added to this reactive intermediate to produce a nitroaromatic compound. The nitroaromatic compound can be substituted with one or more, typically, one to three, and often one or two nitrate (-NO 2 ) groups.
Abstract:
The invention relates to a process for the preparation of a compound of formula I (I), wherein R 1 is hydrogen, fluoro or chloro; which process comprises a) reacting a compound of formula II (II), wherein R 1 is hydrogen, fluoro or chloro; with a nitration agent to the compound of formula (III), wherein R 1 is hydrogen, fluoro or chloro; and b) reacting the compound of formula III with chlorine gas at temperature from 180°C to 250°C to the compound of formula I.
Abstract:
The present invention relates to a method for high-selectivity co-production of adipic acid and nitrocyclohexane, utilizing an oxynitride NOx as an oxidant and nitrating agent to transform in one step with high selectivity cyclohexane to adipic acid and nitrocyclohexane, and, by means of adjusting such conditions of the transformation as the proportions of reactants, the temperature and pressure of the reaction, and the type and quantity of catalyst or inducer, achieving controllability of the proportions of adipic acid and nitrocyclohexane produced. The NO produced by the reaction can be recycled and again reacted with oxygen to produce NOx for cyclical reuse.
Abstract:
The present invention provides the processes for the preparation of eltrombopag of Formula (I) or its pharmaceutically acceptable salts. The invention also provides crystalline forms of eltrombopag.