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6605743 |
Continuous process for the preparation of pivaloyl chloride and of aroyl chloride
The invention relates to a continuous process for the preparation of pivaloyl chloride and of aroyl chloride, in particular of benzoyl chloride, which consists in reacting pivalic acid with a...
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6206819 |
Halogenation catalyst
N,N-disubstituted formamides, wherein the substituents are selected to provide formamides which have low volatility, are useful as halogenation catalysts. Such catalysts are generally less...
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5965772 |
Process for the preparation of 5-(acetyl(2,3-dihydroxypropyl)amino-N,N-bis(2,3-dihydroxypropyl)-2,4,6-t riiodo
A process for the preparation of 5-[acetyl(2,3-dihydroxypropyl)amino]-N,N'-bis(2,3-dihydroxyp
ropyl)-2,4,6-t riiodo-1,3-benzenedicarboxamide of formula (I), starting from...
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5856570 |
Process for preparing 5-amino-2,4,6-triiodoisophthalic acid dichloride by chlorination of the corresponding acid in the presence of a tertiary amine salt or quaternary ammonium salt
A process for the preparation of 5-amino-2,4,6-triiodoisophthalic acid dichloride by chlorinating 5-amino-2,4,6-triiodoisophthalic acid with thionyl chloride in the presence of a suitable solvent...
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5770763 |
Difunctional bitricyclodecatriene monomers
Novel difunctionalized cyclobutabenzene monomers of the general formula: ##STR1## wherein Z can be hydrogens or a cyclobutane ring; and X and Y are carboxyl, amino, alcohol, isocyanate, acid...
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5663432 |
Process for the preparation of 5-amino-2,4,6-Triiodoisophthalic acid dichloride by chlorination with thionyl chloride in the presence of a catalyst
A process for the preparation of 5-amino-2,4,6-triiodoisophthalic acid dichloride by chlorination of 5-amino-2,4,6-triiodoisophthalic acid with thionyl chloride in the presence of a suitable...
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5616795 |
Process for the preparation of a dicarboxylic acid dichloride
The present invention refers to a process for the preparation of 5-amino-2,4,6-triiodo-1,3-benzenedicarboxylic acid dichloride, comprising the reaction in heterogeneous phase between...
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5334752 |
Cyclobutabenzene monomers
Novel difunctionalized cyclobutabenzene monomers of the general formula: ##STR1## wherein Z can be hydrogens or a cyclobutane ting; and X and Y are carbox amino, alcohol, isocyanate, acid halide,...
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5243067 |
Process of production of 3,4,3',4'-substituted biphenyl compound
A 3,4,3',4'-substituted biphenyl compound represented by the general formula (II): ##STR1## wherein, one of R 1 and R 2 is a -CH 3 group and the one other is a --COOR 5 group, --COOH group, or...
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5206391 |
Process for the preparation of halophthalic anhydrides
A process for the preparation of a halophthalic anhydride, such as chlorophthalic anhydride, comprising the liquid phase reaction of bromine with a halogen substituted hexa- or tetra-hydrophthalic...
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4880576 |
Acid halides, a process for their preparation
An N-alkylated formamide of the formula ##STR1## wherein R 1 denotes alkyl R 2 denotes alkyl with at least 9 carbon atoms or the group ##STR2## wherein A denotes straight-chain or branched...
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4808345 |
Process for the preparation of tetrachloroterephthaloyl dichloride by means of the chlorination of terephthaloyl dichloride with gaseous chlorine
The invention relates to a process for the preparation of tetrachloroterephthaloyl dichloride by means of the chlorination of terephthaloyl dichloride with gaseous chlorine, characterized in that...
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4803294 |
Process and intermediates for the preparation of halogenated protease inhibitors
This invention relates to novel intermediate compounds which are useful for producing the halogenated protease inhibitors that are the subject matter of U.S. Pat. No. 4,469,885. In particular, the...
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4792618 |
Fluorinated carbocylic compounds
Fluoro-substituted carbocyclic compounds are prepared by (A) reacting hydrogen fluoride with a chloro-cyclohexenyl compound of the formula ##STR1## where R 1 and R 2 are independently selected...
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4657708 |
Ethynyl-containing phthaloyl halides
Aromatic monomers, each containing at least one o-ethynyl carboxylic acid halide subunit: ##STR1## wherein X is Cl or Br. These monomers can be reacted with amines to form aromatic polyamide resins...
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4622182 |
5-(4-ethynylophenoxy)isophthalic chloride
Sulfone-ester polymers containing pendent ethynyl groups and a direct and multi-step process for preparing same are disclosed. The multi-step process involves the conversion of a pendent bromo...
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4587312 |
Sulfone-ester polymers containing pendent ethynyl groups
Sulfone-ester polymers containing pendent ethynyl groups and a direct and multi-step process for preparing same are disclosed. The multi-step process involves the conversion of a pendent bromo...
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4581179 |
Process for the preparation of trifluoromethylbenzoyl chlorides and bromides from trifluoromethylbenzoyl fluorides
Trifluoromethylbenzoyl chlorides or bromides are prepared by contacting trichloromethylbenzoyl chlorides or tribromomethylbenzoyl bromides with trifluoromethylbenzoyl fluorides in the presence of a...
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4575547 |
Low-melting aromatic polyesters of trifluoromethyl terephthalic acid or ester forming derivatives thereof
Aromatic polyesters exhibiting melt processability are disclosed. The polyesters comprise repeating units of the formula ##STR1## wherein X is hydrogen, halogen, alkyl or nitro. The polyesters...
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4500471 |
Preparation of trifluoromethyl-benzoyl halides
Trifluoromethylbenzoyl chlorides are prepared by the reaction of trichloromethylbenzoyl chlorides or tribromomethylbenzoyl bromides with about 3 moles or less of hydrogen fluoride in the presence...
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4460785 |
Acid chloride of pyromellitic anhydride
Pyromellitate diester-diacid chlorides are disclosed that are useful as intermediates in the synthesis of a variety of soil and water repelling compounds. The pyromellitates of this invention...
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4377536 |
Polyamide derivatives having unsaturated terminal amic acid groups
Novel compositions comprising unsaturated polyhemi-amic acid compositions and processes for their preparation are disclosed herein. These new compositions are primarily derivatives of...
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4374770 |
Process for preparation of aromatic acid chlorides
Disclosed is a process for converting aromatic aldehydes to the corresponding acid chlorides by reacting an aromatic aldehyde with sulfuryl chloride in the presence of a catalytic amount of a...
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4239747 |
Dicarboxylic acid bis(3,5-dicarbamoyl-2,4,6-triiodoanilides) useful as x-ray contrast agents
Dicarboxylic acid bis(3,5-dicarbamoyl-2,4,6-triiodoanilides) of the formula ##STR1## wherein R 1 is lower straight-chain or branched-chain mono- or polyhydroxyalkyl; R 2 is hydrogen, lower...
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4167525 |
Process for preparation of aromatic acyl chloride
An aromatic acyl chloride is obtained with industrial advantages by reacting an aromatic carboxylic acid, phosphorus trichloride and chlorine, treating the reaction mixture comprising by-produced...
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4165337 |
Process for producing phthaloyl dichlorides of high purity
A batchwise or continuous process for producing isophthaloyl dichloride or terephthaloyl dichloride having a high purity which comprises, in combination, (1) a first step of producing...
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4091017 |
Method of preparing terephthalic acid dichloride and isophthalic acid dichloride
Production of terephthalic acid dichloride and isophthalic acid dichloride by hydrolysis with water as a gas according to the following overall reaction: ##STR1## A Friedel-Crafts catalyst is used...
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4029560 |
Process for producing α,α,α,α',α',α'-hexachloroxylene
This invention concerns to a process for α,α,α,α',α',α'-hexachloroxylene by reacting m-xylene or p-xylene or a partially chlorinated product thereof with chlorine under the irradiation of...
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4022817 |
Esters prepared from diacylium complexes of tetrahaloterephthalic acid
Diacylium complexes of tetrahaloterephthalic acid can be produced by reacting tetrahaloterephthalic acid with sulfur trioxide to form compounds capable of reacting with various nucleophilics.
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3950414 |
Preparation of aromatic diacid chlorides
An aromatic dicarboxylic acid chloride, e.g., terephthaloyl chloride, is prepared by reacting chlorine with a solution of an aromatic dialdehyde in an inert solvent, e.g., carbon tetrachloride, at...
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3903144 |
5-(1-Methyl-3,4,5,6,7,7-hexachloro-norborn-4-ene-1)-isophthalic acid
New chemical compounds useful as intermediates are 5-(1-methyl-3,4,5,6,7,7-hexahalo-norborn-4-ene-1)-isophthali
c acid and 4-(1-methyl-3,4,5,6,7,7-hexaholo-norborn-4-ene-1)-orthophtha
lic acid,...
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3878244 |
Process for the production of terephthalic acid dichloride
Process for preparing terephthalic acid dichloride in high yields by chlorination of a mixture of polyethylene terephthalate and terephthalic acid at elevated temperatures and preferably at...
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3875226 |
Preparation of acid halides
Acid halides are prepared by reacting in the presence of a Lewis acid catalyst (a) sulfur dioxide, and (b) an organic compound bearing one or more allylic acid/or benzylic trihalomethyl groups. By...
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3835187 |
PROCESS FOR PREPARING AROMATIC ACID CHLORIDES
Aromatic acid chlorides can be prepared in high quality and yield by a process comprising (1) reacting an aromatic compound bearing at least one trichloromethyl group with more than 1 and up to...
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3835186 |
PROCESS FOR PREPARATION OF AROMATIC CARBOXYLIC ACID CHLORIDE
A process for the preparation of aromatic acid chlorides characterized by reacting a polyester comprising an aromatic dibasic acid as the main acid component with at least one kind of...
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3758570 |
PROCESS FOR THE PRODUCTION OF ACYLISOCYANIDE DICHLORIDES AND CARBOXYLIC ACID CHLORIDES
Acylisocyanide dichlorides and carboxylic acid chlorides are obtained by reacting a carboxylic acid anhydride and an isocyanide dichloride in the presence of a Lewis acid at a temperature of from...
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3681452 |
AROMATIC ACID CHLORIDE PROCESS
Process for preparing aromatic acid chlorides such as isophthaloyl chloride and terephthaloyl chloride, useful as intermediates for making polyester, polyamide and the like condensation polymers,...
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3544627 |
THIOUREA AND ITS LOWER ALKYL SUBSTITUTED DERIVATIVES AS CATALYSTS IN THE PRODUCTION OF CARBOXYLIC ACID CHLORIDES
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3544626 |
QUATERNARY AMMONIUM AND PHOSPHONIUM SALTS AS CATALYSTS IN THE PRODUCTION OF CARBOXYLIC ACID CHLORIDES
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3462482 |
FLUOROPERHALOISOPROPYL BENZENE CARBOXYLIC ACIDS
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3449416 |
PROCESS FOR THE PREPARATION OF ACID HALIDES
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3337624 |
Amides of 4, 5, 6-trichloroisophthalic acid
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3320298 |
Methyl s-isopropyl 2, 3, 5, 6-tetrahalo-monothioterephthalates
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3318933 |
Hexachlorobicycloheptenyl aromatic acids and derivatives thereof
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3290353 |
Halogenated aromatic nitriles
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3274242 |
Preparation of aromatic acid chlorides by vapor phase chlorination of aromatic aldehydes
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3240792 |
Tetrafluorophthalic acids and derivatives
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3234274 |
Production of terephthalyl chloride and chloroacetyl chlorides
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3114756 |
Tetracyano-benzoquinone-(1, 4) and process for preparing it
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2865959 |
Chlorination of aromatic carboxylic acid esters
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