Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 7253324 | Process for the synthesis of biologically active oxygenated compounds by dealkylation of the corresponding alkylethers Alkoxy aromatic compounds are conveniently dealkylated to the corresponding phenolic compounds by treatment with aluminum chloride/N,N-dimethyl aniline complex. Aromatic poly O-demethylation is a unique feature of this invention. This process is applicable to the ma... | 08/07/2007 |
| 6794548 | Method of producing 4,4′-biphenol A method for producing 4,4′-biphenol, comprising the steps of: preparing serially arranged reaction bathes for two or more steps; and carrying out a debutylation reaction of 3,3′,5,5′-tetra-t-butyl-4,4′-biphenol sequentially in the presence of ... | 09/21/2004 |
| 6639094 | Process for producing -aminoketone derivatives A process for producing -amino-dihalogenated methyl ketone derivatives by reacting an N-protected -amino acid ester with a dihalomethyl lithium is provided. This process is suitable for the production on an industrial scale and by this proce... | 10/28/2003 |
| 6512149 | Method for removing butyl groups from butyl phenol compounds By bringing a p-butylphenol compound or m-butylphenol compound in the gas phase into contact with a solid acid catalyst, i.e., a silica-alumina catalyst or alumina catalyst while heating, butyl groups are removed from the butylphenol compound and at the s... | 01/28/2003 |
| 6399838 | Process for preparing 2,6-dimethylphenol A process for preparing 2,6-dimethylphenol from 2,4,6-trimethylphenol is provided. The process includes two steps: (1) selective oxidation of 2,4,6-trimethylphenol to 3,5-dimethyl-4-hydroxybenzaldehyde and (2) deformylation of the resulting benzaldehyde t... | 06/04/2002 |
| 5969196 | Process for preparing 3,5-dimethylphenol For the preparation of 3,5-dimethylphenol by catalytic demethylation of isophorone in the gas phase in the presence of a metal or a metal alloy as catalyst, an isophorone-containing process stream is guided through reaction zones that contain said catalys... | 10/19/1999 |
| 5463129 | Cleaving arylethers The present invention relates to a method of cleaving arylethers such as arylethers represented by the formula: ##STR1## wherein R is hydrogen, C1 -C6 alkyl, cycloalkyl, phenyl, substituted phenyl or CH.dbd.CH2 ; each... | 10/31/1995 |
| 5324868 | Method for preparing 4,4'-biphenol 4,4'-Biphenol is prepared through debutylation of 3,3', 5,5'-tetra-tert-butyl-4,4'-biphenol in an organic solvent in the presence of an acid catalyst wherein the debutylation is carried out continuously using at least two reactors aligned in series, with ... | 06/28/1994 |
| 5171895 | Removal of guaiacol from cresylic acid feedstreams Purification of cresylic acid by guaiacol removal from lignite-based feed as well as other naturally occurring sources of cresylic acid is accomplished by catalytic demethylation in the presence of an alumina catalyst. In the process of this invention, de... | 12/15/1992 |
| 5099076 | Method for preparing p,p'-biphenol The present invention is directed to a method for the preparation of p,p'-biphenol by simplified processes achieved by batch or continuous operations which comprises using phenol and isobutylene as starting materials, allowing phenol to react with isobuty... | 03/24/1992 |
| 5097080 | Process for preparing 4,4'-dihydroxybiphenyl A process for preparing 4,4'-dihydroxybiphenyl is disclosed, which comprises debutylation of 3,3', 5,5'-tetra-t-butyl-4,4'-dihydroxybiphenyl in an organic solvent in the presence of an acid catalyst, wherein said debutylation is carried out in the presenc... | 03/17/1992 |
| 5072055 | Process for the preparation of substituted phenols The substituent X in the phenols of the formula: ##STR1## wherein R1 to R4 are hydrogen or unsubstituted or substituted alkyl, alkenyl or alkynyl, and X is secondary or tertiary alkyl of 3 to 9 carbon atoms, can be removed by he... | 12/10/1991 |
| 4950808 | Process for the preparation of 4,4'-dihydroxybiphenyl Reducing 3,3', 5,5'-tetra-t-butyldiphenoquinone with 2,6-di-t-butylphenol, in the melt, in the presence of a 4-dialkylaminopyridine, and then dealkylating the intermediate formed, in the melt, by adding a phosphorus-containing acid or its derivative provi... | 08/21/1990 |
| 4891453 | Process for producing p,p'-biphenol A process is disclosed which is capable of producing p,p'-biphenol of high purity by the dealkylation reaction of 3,3',5,5'-tetra-t-butyl-4,4'-dihydroxybiphenyl and which yet allows isobutene to be recovered in high yield. The process performs the de... | 01/02/1990 |
| 4847435 | Process for the recovery of high-purity m-ethylphenol A meritorious, commercially successful process for the recovery of a high-purity m-ethylphenol from ethylphenol mixtures containing m- and p-ethylphenols as the major components is disclosed. As it is well known in the art, the ethylphenol mixtures contai... | 07/11/1989 |
| 4754081 | Process for dearylation of alkylenebisphenols and alkyltrisphenols Alkylenebisphenols and alkyltrisphenols are dearylated under mild conditions of temperature and pressure in the absence of HF to obtain alkyl and/or alkenyl substitute or phenols and other related polymer products.... | 06/28/1988 |
| 4695659 | Method for dealkylation of alkyl-aryl ethers A method is disclosed for the dealkylation of alkylaryl ethers by reaction with aluminum triodide under reflux. The reaction is carried out in the presence of a catalytic amount of a quaternary ammonium iodide in a substantially non-aqueous organic solven... | 09/22/1987 |
| 4667037 | Dealkylation of opioid ethers An improved process for the dealkylation of alkyl aryl ethers to aryl phenols is provided. In this process, an alkyl aryl ether, such as a methyl ether of an opioid, is contacted with an aqueous acid selected from HBr, HCl, or HI which contains at least o... | 05/19/1987 |
| 4605790 | Phenol from coal and biomass Phenol is prepared from mixed phenols derived from coal or biomass by separation of the mixed phenols, isomerization of m- and/or p-cresols to o-cresol, demethylation of o-cresol, dealkylation of xylenols and other alkyl phenols, recycling of products oth... | 08/12/1986 |
| 4560810 | Catalytic dealkylation of alkylated phenols Alkylated hydroxyaromatic compounds, particularly alkylated phenols such as mesitol and 2,4-xylenol, are selectively ortho-dealkylated by contact at a temperature within the range of about 350°-500° C. with a catalyst comprising a combination of at leas... | 12/24/1985 |
| 4533767 | Catalytic hydrodealkylation of alkylated phenols Selective catalytic steam dealkylation of ortho- and para-positions of alkylated phenols is accomplished by reacting ortho- and/or para-alkylated phenols with steam in the presence of a catalyst comprised of magnesium oxide, optionally manganese oxide and... | 08/06/1985 |
| 4533768 | Zinc oxide catalyzed dealkylation of alkylated phenols Selective catalytic steam dealkylation of ortho- and para-positions of alkylated phenols is accomplished by reacting ortho- and/or para-alkylated phenols with steam in the presence of a catalyst comprised of zinc oxide, optionally manganese oxide and opti... | 08/06/1985 |
| 4473713 | Hydrolysis of aryl-aliphatic ethers At least one of the other functions comprising an aryl-aliphatic ether, e.g., veratrol, is catalytically hydrolyzed with water, e.g., to guaiacol, in the presence of a catalytically effective amount of a salt of a carboxylic acid.... | 09/25/1984 |
| 4431850 | Low temperature hydrodealkylation of alkylated phenols A process for thermal dealkylation of alkylated phenols feedstocks, which comprises reacting a feed mixture containing mono and poly-alkylated phenols and gaseous hydrogen at temperature ranging from about 900° to about 1100° F. at hydrogen partial pres... | 02/14/1984 |
| 4351968 | Production of organic compounds Pyrogallol, and analogues thereof having an alkyl, carboxy or alkoxycarbonyl substituent in the benzene ring, and their salts, are prepared by oxidizing, preferably by hydrogen peroxide, the corresponding compounds in which 1 or 2 of the OH groups are rep... | 09/28/1982 |
| 4230896 | Catalytic steam dealkylation of alkyl phenols This invention provides a method for the selective dealkylation of alkylated phenols, which method comprises reacting a feed solution comprising a mixture of alkylated phenols with steam in the presence of a catalyst comprising a hydrous carrier, at least... | 10/28/1980 |
| 4230895 | Thermal hydrodealkylation of alkyl phenols The present invention provides a process, for the thermal dealkylation of alkylated phenols, which process comprises reacting a feed solution containing alkylated phenols and gaseous hydrogen in the presence of water vapor, the reaction being carried out ... | 10/28/1980 |
| 4228311 | Selective dealkylation of 4-tertiary-alkyl-2,5-xylenol A method is described for the selective dealkylation of 4-tertiary-alkyl-2,5-xylenol while it is admixed with 6-tertiary-alkyl-2,4-xylenol by contacting the mixture of alkylated xylenols with a polymer-bound sulfonic acid catalyst at temperatures of ... | 10/14/1980 |
| 4205187 | Process for preparing p,p'-biphenol of high purity A process for preparing p,p'-biphenol is provided which comprises heating a 4,4'-bis(substituted phenol) at elevated temperatures below the decomposition temperature of p,p'-biphenol in the absence of a catalyst under an inert, non-reactive atmosphere for... | 05/27/1980 |
| 4191844 | Hydrodealkylation process and catalyst Hydrodealkylation of alkyl-substituted aromatic compounds by contacting with hydrogen in the presence of a catalyst of manganese oxide and a Group IIA metal oxide such as magnesium oxide, optionally promoted with a Group VIII hydrogenation metal such a ni... | 03/04/1980 |
| 4189613 | Hydrodealkylation process Substituted aromatic compounds are hydrodealkylated in the presence of hydrogen and a low sodium content chromia-alumina catalyst under conditions of temperature and pressure such that a small amount of nonrecyclable dehydroxylated products such as benzen... | 02/19/1980 |
| 4152529 | Dealkylation of halogenated alkyl substituted phenols Halogenated alkyl substituted phenols may be dealkylated by treating a compound such as 5-t-butyl-2-fluorophenol with a diealkylation catalyst such as an acid acting compound at dealkylation conditions whereby the t-butyl substituent is removed and the re... | 05/01/1979 |
| 4150243 | Process for the dealkylation of tert.-alkyl substituted phenols A process for the tertiary dealkylation of a tertiary alkyl containing m- and/or p-cresol wherein a tertiary alkyl containing m- and/or p-cresol is continously introduced into a reaction vessel with a small amount of sulfuric acid or an quivalent amount o... | 04/17/1979 |
| 4125560 | Aromatic amines synthesis process and products resulting from application of this process The invention pertains to an aromatic amines synthesis process, fundamentally characterized by the fact that it consists of carrying out the ammonolysis of phenols under pressure in liquid phase by ammonia in aqueous solution.... | 11/14/1978 |
| 4112003 | Process for preparing polyphenols Polyphenols of the general formula: ##STR1## wherein R represents a readily cleavable ether group and R' represents a hydrogen atom or a lower alkoxycarbonyl, such as the methoxycarbonyl or ethoxycarbonyl group, and of phloroglucinol, are made by hea... | 09/05/1978 |
| 4110544 | Preparation of cresols A process for preparing cresols from di-hydrocarbyl-substituted cresols, wherein the hydrocarbyl groups contain from 3 to 7 carbon atoms, is disclosed. In the process the di-hydrocarbyl-substituted cresol is contacted with a catalyst (e.g. alumina) in the... | 08/29/1978 |
| 4110253 | Method for the disproportionation of highly alkylated phenols with phenol This invention provides an improved process for the disproportionation of highly alkylated phenols with phenol using an improved magnesium oxide catalyst promoted with tungsten oxide, silica sol, and sodium silicate. The method provides a catalyst having ... | 08/29/1978 |
| 4110543 | Method of preparing hydrocarbyl-substituted cresols A method of preparing hydrocarbyl-substituted cresols is disclosed. The method comprises heating a mixture of mono- or di-hydrocarbyl-substituted cresols and an alcohol, which is benzyl alcohol or a C1 -C10 aliphatic alcohol, at an e... | 08/29/1978 |
| 4100207 | Preparation of methyl-substituted phenols A method of preparing methyl-substituted phenols is disclosed. The method comprises heating a mixture of mono- or di-hydrocarbyl-substituted cresols and methanol at an elevated temperature in the presence of a catalytic amount of magnesium oxide.... | 07/11/1978 |
| 4071566 | Preparation of cresols and xylenols from tetramethylphenols and pentamethylphenol Cresols and xylenols are prepared by reacting a mixture of tetramethylphenols and pentamethylphenol with phenol in the liquid phase in the presence of a catalyst selected from the group consisting of activated carbon, magnesium oxide, magnesium carbonate ... | 01/31/1978 |
