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7541489 |
Method of making halophthalic acids and halophthalic anhydrides
A method of preparing a halophthalic acid is disclosed which comprises the steps of contacting in a liquid phase reaction mixture at least one halogen-substituted ortho-xylene with oxygen and...
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6670487 |
Method for removing impurities from oxidation products
Disclosed is a method for removing impurities from products derived from oxidation of an ortho-dialkylaromatic compound which comprises at least one step selected from the group consisting of...
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6657068 |
Liquid phase oxidation of halogenated ortho-xylenes
A method for the manufacture of halophthalic acid by liquid phase oxidation of halo-ortho-xylene is disclosed. The halophthalic acid may be dehydrated to form halophthalic anhydride which is useful...
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6657067 |
Method for the manufacture of chlorophthalic anhydride
A method for the manufacture of chlorophthalic acid by liquid phase oxidation of chloro-ortho-xylene is disclosed. The chlorophthalic acid may be dehydrated to form chlorophthalic anhydride which...
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6653321 |
Naphthylsulfonic acids and related compounds as glucose uptake agonists
Methods for treating conditions associated with hyperglycemia, especially Type II diabetes, with novel naphthylsulfonic acids and related compounds. These compounds, as single stereoisomers or...
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6649773 |
Method for the manufacture of halophthalic acids and anhydrides
A method for the manufacture of halophthalic acid by liquid phase oxidation of halo-ortho-xylene is disclosed. The halophthalic acid may be dehydrated to form halophthalic anhydride which is useful...
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6528663 |
Methods for the preparation of 4-chlorophthalic anhydride
A method for the synthesis of substituted phthalic anhydrides (IV) wherein R′ is a halogen, aromatic or aliphatic group comprising 1-18 carbons, hydrogen or nitro group is the transimidation...
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6031061 |
Bis (triaklyltrimellitic anhydride) derivative and polyesterimide for optical communications formed therefrom
A bis(trisubstitutedtrimellitic anhydride) derivative and a polyesterimide for optical communications, the polyesterimide being formed therefrom. The polyesterimide has a high refractive index, so...
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5977379 |
Process for the preparation of flame-resistant halogenated imide compounds
The invention relates to the preparation of halogenated imides derived from hydrazine, a halogen and a dicarboxylic acid anhydride and capable of being employed as fireproofing agents for plastics....
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5648504 |
Process for producing tetrafluorophthalic anhydride
A process for producing tetrafluorophthalic anhydride, which comprises chlorinating tetrachlorophthalic anhydride to obtain 3,3,4,5,6,7-hexachloro-1-[3H]-isobenzofuranone, then fluorinating it to...
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5574172 |
Process for producing halogenated phthalic anhydride
The disclosure describes a process for producing halogenated phthalic anhydride, which comprises reacting phthalic anhydride with a molecular halogen in vapor phase in the presence of a catalyst...
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5523476 |
Processes for producing tetrafluorophthalic anhydride and fluorobenzoic acids
A process for producing tetrafluorophthalic anhydride, which comprises chlorinating tetrachlorophthalic anhydride to obtain 3,3,4,5,6,7-hexachloro-1-[3H]-isobenzofuranone, then fluorinating it to...
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5493033 |
Process for purifying tetrachlorophthalic anhydride
In the purification of crude tetrachlorophthalic anhydride containing hexachlorobenzene as impurities, this invention relates to purification by decomposition in which crude tetrachlorophthalic...
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5405995 |
Difluorophthalic compounds and their preparation
Disclosed are novel compounds having the formula ##STR1## where A is O or NR, each R' independently selected from hydrogen, R, or M, R is alkyl, aryl, alkaryl, or aralkyl from C 1 to C 12 , and M...
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5384413 |
Process for the preparation of tetrafluorophthalic acid and/or tetrafluorophthalic anhydride
The present invention relates to a process for the preparation of tetrafluorophthalic acid and/or tetrafluorophthalic anhydride by reacting a compound of the formula ##STR1## in which X is a...
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5322954 |
Synthesis of 4-substituted phthalic anhydrides
Disclosed is a method of making a 4-substituted phthalic anhydride. A halomaleic (including halofumaric anhydride (or the acid or ester thereof) is made by the reaction of-maleic anhydride with...
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5288879 |
Tetrahalophthalic anhydride process
This invention relates to an improvement in a process for preparing tetrabromophthalic anhydride whereby there is a substantial recovery of reactants such as halogen and SO 3 from a vent stream...
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5233054 |
Process for the preparation of halophthalic anhydrides
Halophthalic anhydrides are prepared by the liquid phase reaction of a brominating agent with halogen substituted hexa- or tetra-hydrophthalic anhydrides.
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5225573 |
Intermediates to tetrabromophthalic anhydride and process therefor
Tetrabromophthalic anhydride and the corresponding free acid are propared by oxidizing in the liquid phase a compound of the formula ##STR1## each of A and A' is independently selected from oxygen,...
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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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5200556 |
Process for the preparation of 3,4,6-trifluorophthalic acid and the anhydride thereof
Process for the preparation of 3,4,6-tetrafluorophthalic acid of the formula (1) ##STR1## or the anhydride thereof in good yields and in an advantageous manner, by dehalogenating...
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5185454 |
Process for the preparation of symmetrical diarylacetylenes
Symmetrical diaryl-acetylenes can be prepared by reacting an aryl halide with acetylene in the presence of a palladium catalyst and a base. If the acetylene is introduced into the liquid reaction...
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5086188 |
Preparation of 3,5-dichlorophthalic acid and 3,5-dichlorophthalic anhydride
Plychlorophthalimides, specifically, N-substituted tetrachlorophthalimides and N-substituted trichlorophthalimides may be treated with zinc and a base in aqueous soluction to yield, after...
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5059697 |
Preparation of halogenated phthalic anhydrides
A process for the aromatization of 4-chlorotetrahydrophthalic anhydride and 4,5-dichlorotetrahydrophthalic anhydride which comprises heating a solution of either substance in the presence of...
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5003088 |
Method for the preparation of halophthalic anhydrides
Halophthalic anhydrides are prepared by reaction of chlorine with a saturated or partially saturated halophthalic anhydride at a temperature of 200° to 500° Celsius.
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4978760 |
Preparation of halogen substituted phthalic anhydride
A process for the preparation of halogen substituted phthalic anhydrides of the formula: ##STR1## wherein x is a halogen, by the reaction of a halogen substituted tetrahydrophthalic phthalic...
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4962206 |
Process for the preparation of 4-bromophthalic anhydride
A process for the production of 4-bromophthalic anhydride which comprises the reaction of 4-chlorotetrahydrophthalic anhydride with elemental bromine, in the presence of a catalytically effective...
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4814467 |
Processes using a phosphorus complex
A process for chlorinating compounds containing a carbon atom bonded to a hetero-atom selected from the group consisting of oxygen, nitrogen and sulfur; said process comprises contacting the carbon...
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4785121 |
Preparation of halophthalic anhydrides
A process for selectively substituting an aromatic nitro group of a nitrophthalic anhydride with a halo group which comprises contacting the nitroaromatic-containing compound with a phosphorus...
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4785114 |
Quinophthalone dyes
Quinophthalone dyes of the formula ##STR1## where X is O or NC--C--R, where R is cyano, unsubstituted or N-substituted carbamyl, carboalkoxy, quinazolonyl, quinoxalinonyl, benzimidazolyl or...
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4709056 |
4,4-dihalohexahydrophthalic anhydrides and 4-fluorotetrahydrophthalic anhydride, and process for their preparation
4,4-dihalohexahydrophthalic anhydrides of the formula ##STR1## where Y is chlorine or fluorine, are prepared by the reaction of hydrogen fluoride with 4-chlorotetrahydrophthalic anhydride. The...
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4684737 |
Process for producing substituted phthalic acid compounds
A process for producing a substituted phthalic acid which comprises heating a substituted tetrahydrophthalic acid compound having a substituent in at least one of the 3-, 4-, 5- and 6-positions in...
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4650880 |
Purification of substituted phthalic anhydrides
A process for purifying crude substituted phthalic anhydrides, e.g. 4-methylphthalic anhydride, derived from the dehydrogenation in the presence of bromine of a Diels-Alder addition product of a...
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4562254 |
Preparation of 5-fluoro-2-phenyl-4H-3,1-benzoxazin-4-ones
5-Fluorobenzoxazinones (I) ##STR1## where R is hydrogen, halogen, C 1 -C 3 -alkyl, or trifluoromethyl, trifluoromethoxy, chlorodifluoromethoxy, difluoromethoxy, tetrafluoroethoxy,...
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4517372 |
Process for the preparation of 4-fluorophthalic anhydride
This invention relates to a process for the preparation of 4-fluorophthalic anhydride which comprises contacting a dihalohexahydrophthalic anhydride of the formula ##STR1## where X is Cl or F, with...
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4514572 |
Preparation of fluorophthalic anhydrides
Fluorophthalic anhydrides containing 1 or 2 fluorine atoms are prepared by a process in which a chlorophthalic anhydride containing 1 or 2 chlorine atoms is treated with an acid chloride of...
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4329287 |
Halo-(carbonyldioxyaryl)ethylenes
Halo-(carbonyldioxyaryl)ethylenes are prepared by a catalytic process which comprises contacting a halo-bis(hydroxyaryl)ethylene, carbon monoxide, an oxidant, a base, and a Group VIIIB element...
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4302396 |
Chlorinated 4-methylphthalic anhydrides
Novel chlorinated 4-methylphthalic acids or anhydrides of the general formula ##STR1## wherein n is an integer of 1, 2 or 3, with the proviso that when n is 1, the chlorine atom is positioned at 3-...
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4297283 |
Chlorination of phthalic anhydride
An aromatic compound of the class of phthalic anhydride and ortho-phthalonitrile can be monochlorinated, predominantly in the 4-position, by a vapor phase reaction involving passing chlorine and...
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4124593 |
Aromatic dicarboximides
N-(4-aminophenyl)-aromatic dicarboximides, e.g. those of the formula ##STR1## OR SALTS THEREOF ARE ANTICONVULSANTS.
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4054584 |
Method for making bis(thioether anhydride)s
A method is provided for making bis(thioetherphthalic anhydride)s from bis(thioetherphthalimide)s. The latter compounds can be made by using an alkali metal sulfide with a nitro N-organo...
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3972901 |
Diels-Alder type process involving a geminal-dihalocyclopropane and a dienophile
Adducts containing a six-membered olefinically unsaturated ring having a halogen atom on one of the ethylenic carbon atoms (e.g., 3,5-diketo-4,8-dioxa-12-chlorotricyclo[5.3.2.0 2 ,6 ]-dodec-11-ene)...
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3956321 |
Preparation of 4-fluorophthalic anhydride
4-Fluorophthalic anhydride can be prepared by reacting potassium fluoride with 4-nitrophthalic anhydride. The use of solvents can increase the rate of reactivity and reduce the temperature at which...
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3895037 |
Process for preparing a diphenyl carbinol carboxylic anhydride
A process for converting a diaryl ketone carboxylic anhydride to the corresponding diaryl carbinol carboxylic anhydride which involves subjecting a diaryl ketone carboxylic anhydride to...
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3875186 |
PROCESS FOR THE PRODUCTION OF TETRABROMOPHTHALIC ANHYDRIDE
Tetrabromophthalic anhydride is produced by brominating phthalic anhydride at elevated temperatures in the presence of sulfuric acid and a bromination catalyst using bromine and hydrogen peroxide...
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3715383 |
PURIFICATION OF TETRABROMOPHTHALIC ANHYDRIDE
A process for removing sulfate ions from crude tetrabromophthalic anhydride by dissolving it in an alcohol and then contacting the resultant solution with an anion exchanger.
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3480667 |
METHOD OF PRODUCING FLUORINATED COMPOUNDS
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3479380 |
DIALKYLTIN,1,4-ENDOALKYLENE-2,3-DIHYDROPHTHALATES AND -1,2,3,6 - TETRAHYDROPHTHALATES
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3424796 |
PREPARATION OF 4-AMINODIBENZO(A,D) CYCLOALKEN-5-ONES
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3382254 |
Method of making tetrabromophthalic acid anhydride
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