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| Number | Title | Issue Date |
| 7632973 | Methods for preparing aldehydes by self-aldol condensation Methods for preparing self-aldol condensation products of prenyl aldehyde (3-methyl-2-butenal) by use of an amine catalyst under weakly acidic conditions at temperatures of 10° C. or higher are disclosed. Methods are disclosed for the selective formation of α-1,2-... | 12/15/2009 |
| 7399879 | Process for preparing alkylidene-substituted-1,4-dions derivatives A process for the preparation of a monoalkylidene substituted 1,4-dions derivatives of formula (Ia) or (Ib) or a mixture of (Ia) and (Ib): wherein: R1, R2 and R3, equal to or different from each other, are hydrogen atoms or C1 | 07/15/2008 |
| 7323604 | Hydride reduction of α,β-unsaturated carbonyl compounds using chiral organic catalysts Nonmetallic, chiral organic catalysts are used to catalyze the 1,4-hydride reduction of an α,β-unsaturated carbonyl compound. The α,β-unsaturated carbonyl compound may be an aldehyde or cyclic ketone, and the hydride donor may be a dihydropyridine. The reaction ... | 01/29/2008 |
| 7285685 | Method for dehydrogenation of carbonyl compounds Process for preparing alpha, beta-unsaturated acyclic or cyclic carbonyl compounds by dehydrogenation of the corresponding saturated carbonyl compounds in the gas phase over a heterogeneous dehydrogenation catalyst comprising platinum and/or palladium and tin on an ... | 10/23/2007 |
| 7173139 | Enantioselective 1,4-addition of aromatic nucleophiles to α,β-unsaturated aldehydes using chiral organic catalysts Nonmetallic, chiral organic catalysts are used to catalyze the 1,4-addition of an aromatic nucleophile to an α,β-unsaturated aldehyde. The aromatic nucleophile may be an N,N-disubstituted aniline compound, or an analog thereof. The reaction is efficient and enanti... | 02/06/2007 |
| 7074955 | Safe operation of a continuous heterogeneously catalyzed gas-phase partial oxidation of at least one organic compound A continuously operated heterogeneously catalyzed gas-phase partial oxidation of at least one organic compound in an oxidation reactor is operated safely by a process in which an explosion diagram for the feed gas mixture is deposited as the basis of a cut-out mecha... | 07/11/2006 |
| 6784323 | Enantioselective transformation of α,β-unsaturated aldehydes using chiral organic catalysts Nonmetallic organic catalysts are provided that facilitate the enantioselective reaction of α,β-unsaturated aldehydes. The catalysts are chiral imidazolidinone compounds having the structure of formula (IIA) or (IIB) o... | 08/31/2004 |
| 6660812 | Production of olefin derivatives Disclosed is a system of making an olefin derivative from a dilute olefin feed. Dilute olefin is sent to an olefin reaction unit to form an olefin derivative product. The olefin derivative product is recovered from the reaction unit while a vent stream is... | 12/09/2003 |
| 6586636 | Aldol condensation Production of unsaturated aldehydes by the aldol condensation of straight chain aldehydes, e.g. butyraldehyde, by contacting the aldehyde in the vapour phase with a particulate catalyst comprising at least one basic alkali metal compound supported on an i... | 07/01/2003 |
| 6518453 | Method for stabilizing chemical compounds containing at least one ethylenically unsaturated bond in order to prevent undesirable radical polymerization In a process for stabilizing chemical compounds having at least one ethylenically unsaturated bond to undesired free radical polymerization, a nitroxyl radical and a chemical compound containing phosphorus in chemically bonded form are added to the unsatu... | 02/11/2003 |
| 6506944 | Preparation of substituted olefins C6 compounds of the formula (I) E--CH2 --CH.dbd.CH--CH2 --E1 (I) are prepared by self metathesis or cross metathesis of compounds of the formulae (II) and/or (III) R--CH.dbd.CH--CH2 --E (II) R1 --C... | 01/14/2003 |
| 6403838 | Process for preparing 2,7-dimethyl-2,4,6-octatriene-1,8-dial A process for making 2,7-dimethyl-2,4,6-octatrien-1,8-dial starting form an allylic halide is described. The process steps include aldehyde protection, conversion to a sulfide, oxidation to an allylic sulfone followed by a Ramberg-Backlund reaction and hy... | 06/11/2002 |
| 6369277 | Selective liquid-phase hydrogenation of ,ଲ-unsaturated carbonyl compounds An ,ଲ-unsaturated carbonyl compound of formula (I) ##STR1## where R1 is saturated C1-40 -hydrocarbyl or a substituted or unsubstituted aromatic radical containing moiety, and R2, R3 and R4 | 04/09/2002 |
| 6326519 | Diallylic sulfides and processes for preparing the same Diallylic sulfides represented by Formula I ##STR1## wherein: R1 and R2 are independently chosen from the group consisting of --CHO, --CH2 Cl, --CH2 Br, --CH2 I, --CH2 OH, CH2 OS... | 12/04/2001 |
| 6175044 | Preparation of citral 3,7-Dimethyl-2,6-octadien-1-al of formula I is prepared continuously by: ##STR1## thermally cleaving, in the presence or absence of an acid catalyst, 3-methyl-2-buten-1-al diprenyl acetal of formula II: ##STR2## thereby eliminating 3-methyl-2-buten-1-ol o... | 01/16/2001 |
| 5929288 | Process for manufacturing polyene aldehydes To manufacture polyene aldehydes and polyene dialdehydes a polyene O,O-dialkyl acetal or polyene di(O,O-dialkyl acetal) is reacted with a 1-alkoxy-1,3-diene in the presence of a Lewis acid or a Bronsted acid. The reaction mixture is then hydrolyzed and th... | 07/27/1999 |
| 5888923 | Modified Raney nickel catalyst and a process for preparing diols by using the same The present invention relates to a modified Raney nickel catalyst which can serves as hydrogenation catalyst for hydroxy aldehydes, such as 4-hydroxy-butanal, and 2-methyl-3-hydroxypropanal and hydroxy cyclic ethers such as 2-hydroxy-tetrahydrofuran. Furt... | 03/30/1999 |
| 5801292 | Aldehyde process A process for condensing aldehydes where an aldehyde having an a hydrogen and having the formula R1 CHO, wherein R1 is selected from alkyl having one to twelve carbon atoms and aralkyl having one to fourteen carbon atoms, is combined... | 09/01/1998 |
| 5770762 | Process for producing 4-substituted-2-butenals Described is a process for producing a 4-substituted-2-butenal represented by the following formula (1); ##STR1## (wherein X represents an acyloxy group or halogen atom; R represents hydrogen atom, an aliphatic hydrocarbon group or an aromatic hydroc... | 06/23/1998 |
| 5471005 | Method of making 2,7-dimethyl-2,4,6-octatrienedial, a key intermediate in the commercial syntheses of various carotenoids A procedure for forming methylmalonaldehyde from propionaldehyde, an alkyl formate and a sodium alkoxide, utilizing a crossed-Claisen condensation is disclosed. The procedure avoids the formation of aldol condensation products. Also disclosed are processe... | 11/28/1995 |
| 5442095 | Catalysts, process for their preparation, and their use Catalysts based on rhodium and water-soluble phosphine obtained by using rhodium perchlorate as the precursor rhodim salt. Also, processes for the preparation of these catalysts and to their use are provided.... | 08/15/1995 |
| 5382700 | Oxidative coupling of alpha, beta unsaturated aldehydes A process for producing dimeric unsaturated aldehydes from alpha, beta unsaturated aldehyde is disclosed. This process is conducted by contacting the alpha, beta unsaturated aldehyde with a copper (II) catalyst and a complexing amine catalyst in a medium ... | 01/17/1995 |
| 5254743 | Solid bases as catalysts in aldol condensations Solid solutions of a class of divalent metal oxides and a class of trivalent metal oxides resulting from calcination of layered double hydroxides related to hydrotalcite have been prepared with a surface area in excess of 150 m2 /g. Such high s... | 10/19/1993 |
| 5254742 | Process for preparing 2-hexene-1,6-dial A process for preparing 2-hexene-1,6-dial comprising dimerizing 2-propenal in the presence of an organometallic compound of the group VIII metal. The desired compound can be obtained under mild conditions with industrial advantages.... | 10/19/1993 |
| 5243082 | Process for in-situ production of acrolein Acrolein is prepared by the heating of 3,4-dihydro-2H-pyran-2-carboxaldehyde. The process provides acrolein in very high yields and with few impurities. The process is advantageously employed to produce acrolein at the point of use.... | 09/07/1993 |
| 5177266 | Proccess for the manufacture of 2-alkoxymethylacrolein There is provided a process for the manufacture of 2-alkoxymethylacrolein compounds via the reaction of an appropriate alcohol and acrolein in the presence of an acid and a trisubstituted amine to form an intermediate and the subsequent reaction of the in... | 01/05/1993 |
| 5177265 | Process for the preparation of citral An improved method for preparing citral in liquid phase from prenol and prenal, wherein, in a single reaction enclosure, the prenol and prenal are condensed in the presence of a mineral acid at a concentration of about 5.10-3 mole for one mole ... | 01/05/1993 |
| 5144089 | 2-ethyl-2-hexenal by aldol condensation of butyraldehyde in a continuous process Solid solutions of magnesium oxide-aluminum oxide related to hydrotalcite and what previously has been referred to as synthetic hydrotalcites, have been prepared with a surface area in excess of 250 m2 lg, especially at low Mg/Al atom ratios. S... | 09/01/1992 |
| 5053552 | Process for producing ,ଲ-unsaturated aldehyde The present invention provides a novel process for producing ,ଲ-unsaturated aldehydes including industrial important fragrances such as citral and sinensal, starting materials for preparing pharmaceutical drugs such as senecioaldehyde, farnes... | 10/01/1991 |
| 4987252 | Quenching process of reaction product gas containing methacrylic acid and treatment method of quenched liquid In order to recover methacrolein and/or methacrylic acid by quenching a reaction product gas obtained by catalytic oxidation of isobutylene or the like, the reaction product gas is charged into a quench column through a double-wall pipe and is then brough... | 01/22/1991 |
| 4820876 | Polyethylene wax Synthetic polyethylene wax having low molecular weight of 250 to 3000 and a density of 0.930 to 0.950 is prepared in a high pressure process at pressures of at least 800 bar using a carbonyl compound such as acetaldehyde as chain transfer agent. The resul... | 04/11/1989 |
| 4820858 | Process for the preparation of 2-(hydroxyalkyl)acrylic compounds The invention relates to a process for the preparation of 2-(hydroxyalkyl)acrylic compounds having the formula ##STR1## wherein X represents a --CN group, a --COOR3 group, a --COR4 group or a --CONR4 R5 gro... | 04/11/1989 |
| 4801444 | Medicinal preparation for individual prevention of venereal diseases and treatment of urogenital trichomoniasis A medicinal preparation for individual prevention of venereal diseases and treatment of urogenital trichomoniasis comprises an efficient quantity of an active principle which is essentially a synergistic mixture of para-nitro-alpha-chlorocinnamic aldehyde... | 01/31/1989 |
| 4760193 | Process for the preparation of polyene aldehydes Polyene aldehydes are made by reaction of a carbonyl compound of formula: ##STR1## in which R denotes a hydrocarbon radical and R' denotes hydrogen or alkyl, with a metal derivative of a halogen compound of formula: ##STR2## in which X denotes h... | 07/26/1988 |
| 4739111 | Alpha, beta-ethylenically unsaturated acids and derivatives thereof using a multicomponent acidic catalyst composition containing zirconium A process for preparing a catalyst composition wherein a Metal Hydrocarboxide I, such as aluminum secbutoxide, a Metal Hydrocarboxide II, such as zirconium butoxide, an acidic phosphorus-oxygen composition, such as phosphoric acid, and water, are reacted ... | 04/19/1988 |
| 4709098 | Hydrolysis of activated olefinic ketones and aldehydes Ketones or aldehydes containing one or more carbon-carbon double bonds and a carbonyl group conjugated with at least one double bond are hydrolyzed by the action of heat and pressure in the presence of water. The ketone or aldehyde cleaves at the double b... | 11/24/1987 |
| 4571438 | Process for preparing olefinic aldehydes and chemical intermediates A process for the preparation of olefinic aldehydes and intermediates is disclosed. The condensation of an ,ω-dihalide with a metal acetylide gives an acetylenic halide which can be reduced to give an olefinic halide, then oxidized to give the des... | 02/18/1986 |
| 4528405 | Aldol condensation of enolizable aldehydes using a metal carboxylate catalyst A process is disclosed for the aldol condensation of enolizable aldehydes to alpha, beta-unsaturated aldehydes, at high selectivities, employing a metal carboxylate catalyst.... | 07/09/1985 |
| 4503239 | Process for the preparation of ethylenic halogenoacetals Process for the preparation of halogenoacetals of the general formula: ##STR1## wherein X represents chlorine or bromine, the symbols R each represent a linear or branched alkyl radical (1 to 6 carbon atoms) or together form a linear or branched alky... | 03/05/1985 |
| 4487962 | Preparation of methacrylic acid by gas phase oxidation of methacrolein An oxidation catalyst wherein the catalytically active component has the general formula where X is Cr and/or Fe, Y is Nb, Z is Na, Li, K and/or Rb, a is 0.1-4, b is 0.001-1, c is 0.05-2, d is 0.05-4, e is 0.1-5, f is 0-2, g is 0-3 and h is 0-2, and x is ... | 12/11/1984 |
