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8853393 |
Intermediate for preparing tapentadol or analogues thereof
The invention discloses a novel intermediate for preparing tapentadol and analogues thereof, wherein the structural formula is shown as formula I or II, and the groups are defined as the... |
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8198379 |
Halobutyl elastomers
The present invention relates to the modification of butyl elastomers, particularly halobutyl elastomers, under solvent free conditions with a phase transfer catalyst in the presence of an alkyl... |
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6191300 |
Process for the preparation of cyclopropylacetonitrile
Disclosed is a process for the preparation and recovery of cyclopropylacetonitrile by a novel combination of process steps beginning with a mixture of cyclopropylmethyl halide, a cyclobutyl halide... |
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5675029 |
Cyclic process for activation, use and recovery of phase-transfer catalysts
A process of making certain compounds using a phase transfer catalyst that permits the recovery and recycle of the phase transfer catalyst. |
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5099054 |
Organoclay triphase catalysts
In a method of carrying out organic conversions via heterogeneous phase transfer catalysis by contacting immiscible liquid phases containing respective substances capable of interacting, with a... |
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4994597 |
Method for preparing optically active 3,4-dihydroxy butyric acid derivatives
The present invention presents a method for preparation of S-3,4-dihydroxy butyronitrile expressed by the structural formula (II) ##STR1## characterized by causing R-3-chloro-1,2-propanediol... |
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4792606 |
Process for the preparation of dimeric aromatic acyl cyanides
A process for the preparation of a dimeric aromatic acyl cyanide of the formula ##STR1## in which Ar is optionally substituted phenyl, naphthyl or hetaryl,comprising reaction an acyl halide of the... |
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4697035 |
Process for the preparation of basically substituted phenylacetonitriles
A simplified process for the preparation of basically substituted phenylacetonitriles, in particular of verapamil, is described. This process is carried out with fewer stages and higher yields... |
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4661610 |
Preparation of veratryl cyanide
Veratryl cyanide is prepared by chloromethylating veratrol in solution in toluene and then reacting the resulting veratryl chloride with from 1 to 5 moles of an alkali metal cyanide, by a process... |
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4478753 |
Process for the production of 11,11,12,12-tetracyano-9,10-anthraquinodimehane _or its derivatives
A process for producing 11,11,12,12-tetracyano-9,10-anthraquinodimethane or its derivatives of the general formula ##STR1## in which Z1, Z4, Z5, and Z8 independently represent hydrogen, chlorine,... |
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4362884 |
Silacrown ethers, method of making same, and use as phase-transfer catalysts
Organosilicon compounds referred to as silacrown ethers or "silacrowns" are of the general formula: ##STR1## where R1 and R2 are organic radicals or hydrogen and n is an integer between 4 and 10... |
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4360478 |
Preparation of α-cyanobenzyl esters
New α-halobenzyl esters, intermediates for α-cyanobenzyl pyrethroid esters, are prepared by treating a benzaldehyde derivative with a pyrethroid acid halide. The resulting α-halobenzyl ester is... |
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4322369 |
Preparation of alkyl cyanoacetates
The alkyl cyanoacetates are prepared by reacting an alkyl chloracetate with an excess of an alkali metal cyanide, in an inert solvent and in the presence of at least one tertiary amine... |
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4229366 |
Process for heterogeneous nucleophilic substitution reactions
The invention relates to a process for nucleophilic substitution reactions. According to the invention the reaction is carried out in a heterogeneous system, consisting of a solid and a dissolved... |
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4144265 |
Process for the manufacture of m-trifluoromethyl benzyl nitrile
Quaternary ammonium salts, such as methyl tributyl ammonium chloride, are novel catalysts in a nitrile-forming reaction which comprises stirring together aqueous sodium cyanide and the undistilled... |
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4138429 |
Process for the manufacture of o-phenylenediacetonitrile
A process for the manufacture of o-phenylenediacetonitrile by reacting an aqueous solution of an alkali metal or alkaline earth metal cyanide with an o-xylylene halide optionally in the presence... |
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4069340 |
Immonium salts and derivatives thereof
There are provided: novel aryloxy immonium salts, prepared by the reaction of their corresponding haloformates with amides; and phenolic compositions corresponding to the aryloxy immonium salts.... |
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4056509 |
Preparation of benzyl cyanides
Optionally ring-substituted benzyl cyanides are prepared by reacting the corresponding benzyl halide with an aqueous phase containing cyanide ions in the presence of a liquid organic phase... |
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4022816 |
Purification of chlorobutyronitrile
Chloro alkyl nitriles containing from about 3 to about 7 carbon atoms, such as chlorobutyronitrile, are produced in high purity by reacting the corresponding bromochloro alkane, typically... |
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4001293 |
Process for production of γ-halonitriles
A new process for preparing γ-halonitriles comprising reacting by contacting a 1,3-dihalopropane, such as 1-chloro-3-bromopropane, or mixtures thereof, such as 1-chloro-3-bromopropane and... |
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3992432 |
Phase transfer catalysis of heterogeneous reactions by quaternary salts
A process for catalyzing heterogeneous ionic organic reactions in a system of multiple liquid phases in which at least two of the reactants are each located in a different phase with respect to... |
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3941827 |
Preparation of halogenated nitriles
A process is disclosed for preparing halogenated hydrocarbyl nitriles comprising reacting a metal or ammonium cyanide with a dihalogenated aliphatic or alicyclic hydrocarbon of the formula... |
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3917665 |
Preparation of phenylene diacetonitrile
Novel polyamides are prepared by reacting a dicarboxylic acid with 1,4-cyclohexane-bis(β-ethylamine). Unique properties are obtained where the dicarboxylic acid is 1,4-cyclohexane diacetic acid. |
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3839399 |
PRODUCTION OF ORGANIC CYANIDES
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3773808 |
METHOD OF PREPARING CYANOACETIC ACID ESTERS
1,222,638. Cyanoacetic esters. PHILIPS' GLOEILAMPENFABRIEKEN N.V. 23 Oct., 1969 [26 Oct., 1968], No. 51928/69. Heading C2C. Cyanoacetic esters NC.CH 2 .COOR, where R is alkyl, alkenyl, cycloalkyl,... |
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3725458 |
PROCESS FOR PREPARING CYANO-COMPOUNDS
A process for the preparation of terminally substituted cyano-compounds from 1-alkenes. The process involves the preparation of a 1-bromoalkane from the reaction of the 1-alkene and HBr in the... |
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3498999 |
1-PHENOXY AND SUBSTITUTED PHENOXY-3-(5-TETRAZOLYL) PROPANES
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3427322 |
PREPARATION OF CYANOETHERS
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3384654 |
Process for the manufacture of cyanoacetic acid esters
Cyanoacetic acid esters of the general formula CN-CH2-COOR, in which R represents an optionally substituted aliphatic, cycloaliphatic or aralkyl radical, are prepared by reacting at least the... |
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3133114 |
Preparation of nitriles
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3026347 |
Improved process for the nitrilation of 6-halohexanoic acid esters
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3026346 |
Improved process for the nitrilation of 6-halohexanoic acid esters
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2878277 |
Production of adiponitrile
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2841535 |
Purification of dimethyl formamide
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2786072 |
Production of adiponitrile
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2783268 |
Production of adiponitrile
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2783265 |
Preparation of phenylacetonitriles
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2779781 |
Cyanidation catalysts
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2715137 |
Production of nitriles
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2715138 |
Production of adiponitrile
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2399349 |
Production of fumarodinitrile
The present invention relates to an improved method for the production of fumarodinitrile by the reaction of di-iodoethylene with cuprous cyanide. The preparation of fumarodinitrile by reaction of... |