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| Number | Title | Issue Date |
| 7105707 | Process for preparing alkynyl-substituted aromatic and heterocyclic compounds Mono- and disubstituted aryl or heterocyclic acetylenes are produced by a process comprising reacting an aryl nitrile with an alkynylzinc compound, a bis-alkynylzinc compound, or an alkynylmagnesium compound, in the presence of a nickel/phosphine catalyst. ... | 09/12/2006 |
| 6774270 | Method of removing hexafluoropropylene dimers A method of removing hexafluoropropylene dimers (“HFP dimers”), dimer hydrides and other oligomers from a fluid is described. The method comprises heating the fluid to isomerize the HFP dimers to the thermodynamic isomer, and contacting the fluid with a tertiary... | 08/10/2004 |
| 6388151 | Synthesis of Tetraalkylcyclopentadienes A method for synthesizing tetramethylcyclopentadiene from 2,3-dibromobutane is described. A 2-bromo-2-butene Grignard is reacted with an ethyl formate to produce a 3,5-dimethyl-2,5-heptadiene-4-ol magnesium bromide which is then quenched with acetic acid ... | 05/14/2002 |
| 6284894 | Preparation of allylic aromatic compounds A process for the preparation of an allylic aromatic compound in which an aromatic amine is reacted first with a nitrite and then with an allylic olefin having an eliminatable terminal substituent. Novel allylic derivatives of disubstituted benzene compou... | 09/04/2001 |
| 6039895 | Benzoquinoneimines as vinyl aromatic polymerization inhibitors This invention relates to a vinyl aromatic, especially styrene, polymerization inhibitor system comprising an N-phenyl-1,4-benzoquinoneimine compound and optionally an aryl-substituted phenylenediamine.... | 03/21/2000 |
| 5446203 | Synthesis of haloenones and aryl or alkyl substituted enones or alkenes Alternative methods for synthesizing haloenones and haloakenes and their use as starting materials for synthesis of substituted or unsubstituted alkyl and aryl substituted enones and alkenes, including tamoxifen and tamoxifen analogs, using such haloenone... | 08/29/1995 |
| 5264511 | Polymers of bis (ethynylstyryl) benzene and related monomers Monomers, B-stage polymers, C-stage polymers, cured polymers and electricy conducting polymers of acetylene-terminated aromatic monomers containing three benzene rings separated by ethylene groups are disclosed. These new polymers can withstand aggressiv... | 11/23/1993 |
| 5247124 | Process for the preparation of substituted styrenes A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-me... | 09/21/1993 |
| 5235000 | Preparation, storage, and usage of bromine chloride This invention relates to a process for reducing the formation of carbonyl halide in bromine chloride and to an improved process for the bromination of compounds with BrCl in the presence of a carbonyl halide poisonable catalyst.... | 08/10/1993 |
| 5138107 | Phase transfer catalyzed halogenation of carbon acids A process is disclosed for chlorinating, brominating and/or iodinating an organic substrate containing both a single acidic hydrogen atom and at least one electron withdrawing group attached to the same carbon atom. The process replaces the single acidic ... | 08/11/1992 |
| 5132475 | Quaternary ammonium fluoride catalyzed halogenation of carbon acids A process is disclosed for chlorinating, brominating and/or iodinating an organic substrate containing both a single acidic hydrogen atom and at least one electron withdrawing group attached to the same carbon atom. The process replaces the single acidic ... | 07/21/1992 |
| 4960962 | Selective dehydrobromination ar-Bromoaromatics having an alkenyl side chain on the aromatic nucleus are formed by feeding a beta-bromoalkyl-ar-bromoaromatic compound, together with a substantial excess of water, into a thermal dehydrobromination zone held at or above 475° C., and ma... | 10/02/1990 |
| 4898998 | Process for producing brominated acenaphthylene condensates A process for producing brominated acenaphthylene condensates of the formula: ##STR1## wherein x is 1 or 2, y is an integer from 1 to 6 and n is 1 or more, from elementary units of the following formulas: ##STR2## wherein y is as defined ab... | 02/06/1990 |
| 4886922 | Catalyst for dehydrohalogenation A method for preparing an -substituted styrene such as 2-(3,5-dichlorophenyl)-4,4,4-trichloro-1-butene comprising contacting, an -haloalkylbenzene such as 3-(3,5-dichlorophenyl)-1,1,1,3-tetrachlorobutane with a catalyst consisting essen... | 12/12/1989 |
| 4861927 | Dehydrohalogenation of ring-halogenated -halocumenes A process for preparing ring-halogenated -methylstyrenes from the corresponding -halocumenes is disclosed. The dehydrohalogenation is accomplished using only water and optionally an organic solvent. The process eliminates the need for added ... | 08/29/1989 |
| 4760209 | Process for preparing 3,5-dichloro--methylstyrene In the preparation of 3,5-dichloro--methylstyrene by isopropylation of an m/p-dichlorobenzene mixture, isomerization of the resulting alkylation mixture, subsequent side chain bromination of the alkylation mixture and dehydrobromination of the resu... | 07/26/1988 |
| 4748286 | Production of crystalline tribromostyrene The invention relates to an improved process for the production of crystalline tribromostyrene. The process involves removal of hydrogen bromide in a two phase system with the aid of phase transfer catalysts. One of the phases used is an aqueous one conta... | 05/31/1988 |
| 4734534 | Preparing cis-olefinic compounds from acetylenic compounds Novel alumina-supported nickel boride catalysts prepared by the borohydride promoted reduction of nickel arsenate are described. Method of catalyst preparation and process for hydrogenation of acetylenic and diolefinic compounds employing the invention ca... | 03/29/1988 |
| 4686311 | Dehydrohalogenation of haloethyl brominated benzenes A process for the preparation of bromostyrenes which comprises aqueous alcoholic alkali dehydrohalogenation of a 1-haloethyl bromobenzene, a 2-haloethyl bromobenzene, or a 1-methyl-2-haloethyl brominated benzene in the presence of a phase transfer catalys... | 08/11/1987 |
| 4650910 | Process for the preparation of substituted styrenes Substituted styrenes are prepared by treatment on N-acyl-B-phenethylamines with bases and removal by distillation of the styrene which is formed during the reaction.... | 03/17/1987 |
| 4633026 | Process for preparing ring-halogenated vinyl aromatic monomers A process for preparing ring-halogenated vinyl aromatic monomers comprising reacting ring-halogenated (alpha- or beta-bromoethyl)benzenes or ring-halogenated (alpha- or beta-bromoethyl)toluenes with a strong aqueous alkali base in the presence of a poly(e... | 12/30/1986 |
| 4599469 | Hydrogenation process Process for the hydrogenation of functionally substituted acetylenic compounds employing catalyst comprising nickel boride on an inorganic oxide support is disclosed. Functionally-substituted acetylenic compounds are selectively reduced under mild reactio... | 07/08/1986 |
| 4513154 | Process for consecutive competitive gas phase reaction A process for consecutive-competitive gas phase halogenation of organic compounds, i.e. alkanes, alkenes and benzene, alkyl benzenes and alkenyl benzenes containing labile hydrogens and having no more than 12 and 9 carbon atoms, respectively, in a thin re... | 04/23/1985 |
| 4423262 | Preparation of dibromostyrene A process for the preparation of an ar-dibromostyrene which comprises aqueous alcoholic alkali dehydrobromination of 2-bromoethyl dibromobenzene in the presence of a phase transfer catalyst at a temperature of between about 0° C. and about 150° C. The a... | 12/27/1983 |
| 4350824 | Process for the preparation of 1,1-dichloro-alkenes A process for the preparation of a 1,1-dichloroalkene of the formula ##STR1## in which R1 is hydrogen, or an optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, aralkyl, aralkenyl or aryl radical, and R2 is an optionally subs... | 09/21/1982 |
| 4335055 | Process for the preparation of alkenylbenzene derivatives or alkenylnaphthalene derivatives Compounds of the formula I ##STR1## in which Z, Z1, R, m and p are as defined in patent claim 1, can be obtained in a simple and economical manner by a novel process wherein a halide of the formula II ##STR2## is reacted with a s... | 06/15/1982 |
| 4330482 | Process for the preparation of halogenoalkenes In the process for the production of a halogenoalkene of the formula ##STR1## in which R1 is an optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkenyl, aralkyl, aralkenyl or aryl radical or an optionally substituted heter... | 05/18/1982 |
| 4329525 | Production of chlorinated compounds by use of molten salts A compound is chlorinated with chlorine to produce chlorinated product and hydrogen chloride byproduct. Recovered hydrogen chloride byproduct is contacted with oxygen and a molten salt mixture containing the higher and lower valent chlorides of a multival... | 05/11/1982 |
| 4292453 | Process for preparing ring halogenated styrenes The present invention relates to the production of ring-halogenated styrene monomers of high purity. These are of value in the production of polymers which possess flame retardance. The process of the invention comprises reacting heterogenously ring halog... | 09/29/1981 |
| 4233467 | Dehydration of -methylbenzyl alcohols to form monovinylidene aromatic monomers -Alkylbenzyl alcohol and substituted -alkylbenzyl alcohols are converted in high yield and purity to styrene and substituted styrenes by contacting the alcohol in vapor phase with a high efficiency silica gel catalyst.... | 11/11/1980 |
| 4210610 | Process for the preparation of chloroarylacetylene precursors Chloroarylacetylenes such as m-chlorophenylacetylene and certain precursors to such chloroarylacetylene are prepared by reacting a chloroarylbromide with a substituted terminal acetylene compound containing at least three carbon atoms and a hydroxy group ... | 07/01/1980 |
| 4153719 | Aromatic diketones Beta-diketones substituted by an aryl-aliphatic group in which the aliphatic chain is interrupted by a cyclic group, and useful as anti-viral agents, are prepared by interacting the appropriate aryl-aliphatic halide with an alkali metal salt of a beta-dik... | 05/08/1979 |
| 4150059 | Dehydration of alpha-methylbenzyl alcohols over silica to form monovinylidene aromatic monomers -Alkylbenzyl alcohol and substituted -alkylbenzyl alcohols are converted in high yield and purity to styrene and substituted styrenes by contacting the alcohol in vapor phase with silica gel and steam.... | 04/17/1979 |
| 4049736 | Dehydration of -methylbenzyl alcohols to form monovinylidene aromatic monomers -Alkylbenzyl alcohol and substituted -alkylbenzyl alcohols are converted in high yield and purity to styrene and substituted styrenes by contacting the alcohol in vapor phase with silica gel and steam.... | 09/20/1977 |
| 3980722 | Production of bromostyrene, dibromostyrene and alkyl bromides A process for the simultaneous production of bromostyrene or dibromostyrene and of an alkyl bromide, which comprises reacting bromoethyl bromobenzene or bromoethyl dibromobenzene with an alkanol at an elevated temperature. When only these reactants are re... | 09/14/1976 |
| 3979468 | 4'-Chloro-4-ethynylbiphenyl and method of preparing same Ethynylbiphenyl derivatives of the general formula (I): ##SPC1## in which R represents a chlorine or bromine atom in the 2, 3 or 4 position. These compounds have anti-inflammatory activity.... | 09/07/1976 |
| 3966831 | Production of bromostyrenes A process for the production of mono-, di-, and/or tribromostyrene which comprises reacting ଲ-bromomethyl-mono-, di- and/or tribromobenzene at a temperature between 280°C to 470°C in the presence of a free radical source and either a lower alkanol... | 06/29/1976 |
| 3959398 | Alpha-methyl-p-bromo-styrene and method of preparation Alpha-methyl-p-bromo-styrene prepared by the manipulative steps of brominating poly(-methyl-styrene) and subsequently depolymerizing the brominated polymer. The alpha-methyl-p-bromo-styrene has particular utility as a co-monomer for preparing copol... | 05/25/1976 |
| 3957987 | Compositions containing a carbonamidoquinoxaline-di-N-oxide and method of using same Animal feedstuffs are produced which comprise an antibacterially effective amount of a compound of the formula ##SPC1## Wherein Each of R1 and R2, independent of the other, is hydrogen, lower alkyl, hydroxy(lower alkyl), (lower alkox... | 05/18/1976 |
| 3957897 | Method of oxydehydrogenation of alkyl aromatic compounds Certain alkaline earth pyrophosphates, such as Ca, Mg, and Sr pyrophosphates are superior catalysts for oxydehydrogenating alkyl aromatic compounds including nitrogen heterocyclics which have at least one C2 -C6 alkyl side chain to f... | 05/18/1976 |
