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| Number | Title | Issue Date |
| 8143455 | Process for preparing 2-hydroxyacetals and the corresponding 2-hydroxyalkanals What is described is a process for preparing 2-hydroxyacetals of the general formula in which R1 is hydrogen, a branched or unbranched C1-C12-alkyl radical, an electron-deficient, halogen-, NO2—, CN—, CF3—... | 03/27/2012 |
| 7301052 | Process for producing perfluorodiacyl fluorinated compounds The present invention provides a process for producing compounds useful as raw materials for various fluororesins in high yields in few steps from inexpensive and readily available starting materials. The following compound (1) and the following compound (2) ... | 11/27/2007 |
| 7211698 | Method for processing compositions containing 1,1,2,2-tetramethoxyethane and glyoxal dimethyl acetal A process is proposed for distillatively working up an aqueous composition which comprises 1,1,2.2-tetramethoxyethane, glyoxal dimethyl acetal and methanol, wherein the workup of this composition is carried out in a dividing wall column to form low boiler, medium bo... | 05/01/2007 |
| 6969776 | Process for producing fluorinated ketone The present invention provides a process whereby fluorinated ketones of various structures can be produced by short process steps and which is useful as an industrial production process. Namely, it is a process for producing a fluorinated ketone of the follow... | 11/29/2005 |
| 6956138 | Method for producing a fluorine-containing compound The present invention provides a method for obtaining a compound useful as a raw material for various fluororesins in high yield by a short process by using a starting material which is inexpensive and readily available. ... | 10/18/2005 |
| 6867332 | Process for producing xanthohumol present in hops and xanthohumol-rich hop extract obtainable thereby A process is specified by which the xanthohumol present in hops can be isolated in high yield in an economical manner. In the process an ethanol pure resin extract is first extracted with a liquid or supercritical solvent in which the xanthohumol is insoluble and th... | 03/15/2005 |
| 6803488 | Process for producing fluorinated ketone The present invention provides a process whereby fluorinated ketones of various structures can be produced by short process steps and which is useful as an industrial production process. Namely, it is a process for producing a fluorinated ketone of the follow... | 10/12/2004 |
| 6747176 | Preparation of 2-chloro-1,1,1-trialkoxyethane 2-Chloro-1,1,1-trialkoxyethane of formula (II): wherein R1 to R3, which may be the same or different, are alkyl, or any two of the alkyl groups taken together form a cyclic group, is prepared by rea... | 06/08/2004 |
| 6660890 | Production of optically active -hydroxyacetals A process for the heterogeneous and enantioselective hydrogenation of prochiral organic -keto compounds with platinum as the catalyst in the presence of a soluble or immobilized chiral aromatic nitrogen base with at least one basic nitrogen atom ad... | 12/09/2003 |
| 6610892 | Process for preparing 2,7-dimethyl-2,4,6-octatrienal monoacetals The invention relates to a process for preparing 2,7-dimethyl-2,4,6-octatrienal monoacetals of the general formula I ##STR1## which comprises a) condensing an ester phosphonium salt of the general formula II or an ester phosphonate of the general form... | 08/26/2003 |
| 5990360 | Process for the catalytic dealkoxylation of 1,1,3-trialkoxy-2-methyl-butane A novel process for the manufacture of a γ-halotiglic aldehyde HalH2 C-CH.dbd.C(CH3)-CHO [I], wherein Hal signifies chlorine or bromine, comprises haloalkoxylating a 1-alkoxy-2-methyl-1,3-butadiene H2 C.dbd.CH-C (CH3... | 11/23/1999 |
| 5892129 | Process for the preparation of 1,1,3-trialkoxypropane A process for the preparation of 1,1,3-trialkoxypropane by acid-catalyzed reaction of acrolein with a C1 to C6 alcohol, which can be carried out well on a large scale and leads to a higher selectivity. The process involves (a) the re... | 04/06/1999 |
| 5739394 | 3,3-dioxy-4,4,4-trifluorobutyric acid derivatives The invention relates to novel 3,3-dioxy-4,4,4-trifluorobutyric acid derivatives of the formula (I) ##STR1## in which R1 and R2 independently of one another represent C1 -C10 -alkyl, or represent cyclohexyl... | 04/14/1998 |
| 5449836 | Process for the preparation of vitamin A and intermediate compounds which are useful for this process A process for the preparation of vitamin A which preferably comprises bringing cyclogeranyl sulphone into contact with a C10 aldehyde acetal, halogenating the derivative obtained and then removing the halogen group and the sulphone, removing th... | 09/12/1995 |
| 5269955 | Lubricating oil for compression-type refrigerators and polyoxyalkylene glycol derivative Disclosed is a lubricating oil for compression-type refrigerators comprising, as a main component, a polyoxyalkylene glycol derivative which has at least one constitutional unit represented by the general formula: ##STR1## wherein R1 to R | 12/14/1993 |
| 5233063 | Metabolites of pentanedioic acid derivatives The present invention relates to pentanedioic acid derivatives. The present invention further relates to pharmaceutical compositions containing such compounds and the use of such compounds and compositions as hypolipidemic drugs.... | 08/03/1993 |
| 5225550 | Process for the preparation of substituted acyclic nucleosides, and intermediates occurring therein It is possible, by using symmetrical formaldehyde acetals of the formula ##STR1## in which the substituents R1 -R3 have the specified meanings, advantageously to introduce the substituent ##STR2## into nitrogen-containing h... | 07/06/1993 |
| 5206443 | Alkanediol bisacetals Alkanediol bisacetals useful as surface-active substances for industrial purposes, in particular in washing and cleaning agents, have the formula I ##STR1## where R1 is alkyl or alkenyl of from 6 to 30 carbon atoms, A is 1,2-alkylene of from 2 ... | 04/27/1993 |
| 5202480 | Fluorination of acetals, ketals and orthoesters This invention pertains to perfluoropolyethers and perhalogenated chlorofluoroether polymers that can be prepared by fluorinating polymers made by the polymerization of acetals, ketals, polyacetals, polyketals and orthoesters with elemental fluorine.... | 04/13/1993 |
| 5191127 | Glyoxal derivatives and method for making the same This invention provides glyoxal derivatives and a method for making these derivatives. A particularly useful derivative, 1-chloro-1,2,2-trialkoxyethane, and a facile method for making these alpha-halo ethers are provided. The alpha-halo ethers are valuabl... | 03/02/1993 |
| 5025093 | Pyrolysis of perfluoropolyethers A method of breaking down perfluoropolyethers into lower molecular weight fragments by pyrolysis is disclosed. The perfluoropolyethers are pyrolyzed generally at above about 350° C. Volatile lower molecular weight components are condensed and collected. ... | 06/18/1991 |
| 4996375 | Vitamin E intermediates and a process for their manufacture and conversion into Vitamin E Novel methyl carbinol derivatives of Vitamin E and a method for their manufacture.... | 02/26/1991 |
| 4947005 | Preparation of 1,1,2-trialkoxyethanes 1,1,2-Trialkoxyethanes of the general formula I ##STR1## where R1 to R3 are each independently of the others C1 -C20 -alkyl or cycloalkyl, or R1 and R2 may be linked together to form a... | 08/07/1990 |
| 4894484 | Pyrolysis of perfluoropolyethers A method of breaking down perfluoropolyethers into lower molecular weight fragments by pyrolysis is disclosed. The perfluoropolyethers are pyrolyzed generally at above about 350° C. Volatile lower molecular weight components are condensed and collected. ... | 01/16/1990 |
| 4851585 | Vitamin E intermediates Novel methyl carbinol derivatives of Vitamin E and a method for their manufacture.... | 07/25/1989 |
| 4835320 | Process for the preparation of glyoxal monoactals This process for the preparation of products of general formula (I): ##STR1## wherein either R1 and R2, which are identical, represent a --CHRR3 group, in which R and R3, which are identical or different, r... | 05/30/1989 |
| 4755625 | Preparation of 1,1,2-trialkoxyethanes 1,1,2-trialkoxyethanes I ##STR1## where R1, R2 and R3 are each C1 -C8 -alkyl and R1 and R2 may furthermore be bonded to one another to form a 5-membered to 7-membered ring, ... | 07/05/1988 |
| 4743401 | Conversion of an allylic ether to its corresponding acetal A process for converting an allylic ether to its corresponding acetal is disclosed. In this process an allylic ether is contacted with an organic hydroxy compound and a catalytically effective amount of a cobalt compound to produce the corresponding aceta... | 05/10/1988 |
| 4658044 | Intermediates for uracil derivatives Compounds of formula (C) ##STR1## where either RD represents a hydroxymethyl group and RE represents a hydroxyl group or RD represents a protected hydroxymethyl group and RE represents a protected hydroxyl ... | 04/14/1987 |
| 4536585 | Method of making acetals by catalytic reaction of aldehydes with hydroxyalkanes It is disclosed that a Pd-Tl alloy catalyst is used in making acetals and acetalic ethers from alcohols and saturated or unsaturated aldehydes, and to make cyclic acetals and cyclic acetalic ethers when reacting with diols.... | 08/20/1985 |
| 4513144 | Acetal purification with superoxides Trioxane and other acetals are purified by contacting with an alkali metal superoxide, then isolated in a purified form. Optionally, a phase transfer catalyst can be utilized in the purification. Recovered acetals are sufficiently pure for polymerization ... | 04/23/1985 |
| 4460767 | Process for production of sugar ketals A process is disclosed for production of a sugar ketal, which comprises reacting a sugar with a ketone in the presence of (A) (1) copper, or an oxide, hydroxide or salt thereof and (2) hydrogen chloride or hydrogen bromide, or (B) cupric chloride or cupri... | 07/17/1984 |
| 4418217 | Mixed formals of polyglycol ethers A process for the production of a mixed formal of polyglycol ethers having formulae selected from the group consisting of ##STR1## wherein R1 is a straight or branched chain alkyl having from 1 to 18 carbon atoms, and R2 is sele... | 11/29/1983 |
| 4374999 | Internal hydroformylation of acrolein acetals Acrolein acetals are selectively hydroformylated on the unsaturated carbon atom adjacent to the carbon bearing two ether groups in the presence of a supported rhodium-cobalt bimetallic cluster. The resulting internally hydroformylated product is useful as... | 02/22/1983 |
| 4313008 | Synthesis of S-3-chloro-1,2-propanediol The S-enantiomer of 3-chloro-1,2-propanediol is prepared by reaction of a chlorodeoxy-D-saccharide having the partial structure. ##STR1## to cleave the glycol, reduce the aldehyde so formed to an alcohol, and hydrolyse the alcohol under mild acidic c... | 01/26/1982 |
| 4304927 | Carboxylic acids, esters and salts of polyfluoroacetone Compounds of the structure ##STR1## wherein X is --F or Cl and each R is independently --H, --CH3, --C2 H5, --CH2 CH2 CH3, --CH2 CH2 CH2 CH3... | 12/08/1981 |
| 4301090 | Carbonylation of olefinically unsaturated compounds Oxygenated organic compounds, e.g. esters, aldehydes, and amides, are prepared by reacting an olefinically unsaturated compound with carbon monoxide and a compound containing a replaceable hydrogen atom in the presence of a catalyst comprising cobalt carb... | 11/17/1981 |
| 4280011 | Aldehyde generators and foodstuffs containing such generators The use of acetals as aldehyde generators in foodstuff applications is disclosed.... | 07/21/1981 |
| 4209643 | Preparation of acetals A process is described for the production of predominately linear and alpha-branched acetals by reacting a C3 or higher alpha or internal olefin, carbon monoxide, hydrogen, and a C1 -C5 alkanol using a cobalt catalyst in t... | 06/24/1980 |
| 4205186 | Process for preparing substituted oxyacetaldehydes and acetals thereof A process is described for the preparation of substituted oxyacetaldehydes and acetals thereof according to the reaction sequence: ##STR1## wherein R1 and R2 are each lower alkyl or R1 and R2, taken togethe... | 05/27/1980 |
