Abstract:
The present invention relates to a TEMPO-catalyzed oxidation of primary alcohols, RCH.sub.2 OH to corresponding carboxylic acids, RCOOH in the presence of catalytic in the presence of catalytic amount of NaClO and stoichiometric amount of NaClO.sub.2 as an oxidant. ##STR1##
Abstract:
A process for the conversion of a picrate salt, preferably ammonium pricrate, to picric acid by acidifying the picrate salt in a two phase liquid system. One phase is an aqueous phase which contains an acid which is effective for acidifying ammonium picrate to picric acid and the other phase is an organic solvent phase in which the picric acid is soluble.
Abstract:
Novel routes for the preparation of acetonylbenzamides are provided by the reaction of an amine and acyl chloride. Novel routes to various intermediates used in the manufacture of acetonylbenzamides are also disclosed.
Abstract:
A process for oxidizing primary and secondary alcohols to the corresponding aldehydes and ketones is disclosed. The oxidation is carried out by reacting the primary or secondary alcohol with an organic N-chloro compound oxidizing agent in the presence of a catalyst of the formula: ##STR1## wherein the substituent groups are as defined in the specification.
Abstract:
This invention relates to a method for preparing difluoromethyl ethers, thiols and amines without using chlorofluorocarbon gases. The intermediates prepared by this method can be used to make certain compounds which act as PDE IV inhibitors which are useful for treating asthma and other diseases implicated with the PDE IV isozyme.
Abstract:
A process is provided for preparing 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenamine from 4-chlorotrifluoromethylbenzene. The process includes a two stage nitration and an amination step. Ethylene dichloride is utilized as a diluent and solvent in the nitration steps. Spent acid from the first nitration is reconstituted with sulfur trioxide for use in the second nitration. Spent acid from the second nitration is used directly in the first nitration and evaporation is used to remove nitrosoamines from the final trifluralin product.
Abstract:
A method for preparing a compound of formula (I), wherein R.sub.1 and R.sub.2, which are the same or different, are a hydrogen atom or an alkyl or alkoxy radical, or R.sub.1 and R.sub.2, taken together with the carbon atom to which they are attached, form a cycloalkyl radical containing 3-6 carbon atoms. The method comprises dehalogenating a derivative of formula (lI), wherein R.sub.1 and R.sub.2 have the same meanings as in formula (1) and Hal is a chlorine or bromine atom, using 1-2 mol of triethylammonium formate, in the presence of 0.002-0.1 mol of coal-borne palladium per mol of the compound of formula (II), in aceonitrile or tetrahydrofuran and at a temperature between 50.degree. C. and the boiling point of the reaction medium. ##STR1##
Abstract:
The preparation of aromatic olefins from haloaromatics and olefins (Heck reaction) is carried out in the presence of palladium complexes as catalysts, which complexes contain heterocyclic carbenes as ligands.
Abstract:
Substituted phenethanol ethers are prepared in useful yields by the etherification of corresponding substituted phenethyl alcohols with aliphatic primary alcohols. The etherification is carried out by reacting a substituted phenethyl alcohol with an aliphatic primary alcohol in the presence of an acid catalyst at a temperature of at least about 75.degree. C.
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.