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| Number | Title | Issue Date |
| 7015363 | Process for producing ether compound The present invention provides the following process for producing and the like, which enables the production of an ether compound, which is useful for chemical amplification type resist compositions, synthetic intermediates of pharmaceuticals, paints, or the like, ... | 03/21/2006 |
| 6673971 | Preparation of 1,1,4,4-tetramethoxy-2-butene A process for the preparation of 1,1,4,4-tetramethoxy-2-butene by reacting 2,5-dimethoxydihydrofuran with methanol in the presence of acids comprises carrying out the reaction in the presence of solid catalysts having acidic centers.... | 01/06/2004 |
| 6486362 | Process for producing oxygen-containing compounds containing at least one oxygen atom bonded to two distinct carbon atoms which are not bonded together and not including a multiple bond A process for producing oxygen-containing compounds containing at least one oxygen atom bonded to two distinct carbon atoms which are not bonded together and not comprising a multiple bond comprises a step a) for hydroformylation of a feed comprising at l... | 11/26/2002 |
| 6211401 | Process for preparing polytetrahydrofuran Polytetrahydrofuran, tetrahydrofuran copolymers, diesters or monoesters of these polymers are prepared by polymerizing tetrahydrofuran in the presence of at least one telogen and/or comonomer on a heterogeneous carrier catalyst which contains on an oxidic... | 04/03/2001 |
| 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 |
| 5545712 | Preparation process for polyoxyalkylene polyol An alkali metal compound such as metallic cesium, cesium hydroxide, cesium hydroxide monohydrate, metallic rubidium, rubidium hydroxide or rubidium hydroxide monohydrate is used as a catalyst, crude polyoxyalkylene polyol containing the catalyst is neutra... | 08/13/1996 |
| 5527969 | Process for preparing acetaldehyde diethyl acetal A process for preparing acetaldehyde diethyl acetal is provided which involves: reacting acetaldehyde with ethanol in the presence of an acid catalyst and in the presence of an entrainer having a boiling point of from 25° to 75° C.... | 06/18/1996 |
| 5468840 | Preparation process of polyoxyalkylene polyols and process of alkylene oxide recovery An alkali metal compound such as metallic cesium, cesium hydroxide, cesium hydroxide monohydrate, metallic rubidium, rubidium hydroxide or rubidium hydroxide monohydrate is used as a catalyst, crude polyoxyalkylene polyol containing the catalyst is neutra... | 11/21/1995 |
| 5399778 | Process for the preparation of ketals Ketals of longer-chain or branched alcohols are prepared from dimethyl ketals or their ketones by reaction of the dimethyl ketals and the alcohols at high temperatures of 150° to 180° C. in the presence of acid catalysts. The enol ethers and mixed ketal... | 03/21/1995 |
| 5362918 | Process for producing acetaldehyde dimethylacetal A process for producing acetaldehyde dimethylacetal comprising reacting acetaldehyde and methanol in the presence of an acid catalyst is disclosed, in which the reaction is carried out in a part of a rectification tower while conducting rectification to w... | 11/08/1994 |
| 4769497 | Process for the synthesis of 2,2-dialkoxy-propanes A new method of synthesis of a 2,2-dialkoxy-propane e.g. 2,2-dimethoxy-propane, is described through reaction of a cyclic ketal, e.g. 2,2-dimethyl-(1,3)-dioxolane, with a boric acid alkyl ester, e.g. boric acid trimethyl ester, in the presence of an acidi... | 09/06/1988 |
| 4658069 | Conversion of allyl ethers to acetals 9-methoxy-7-nonenal may be isomerized in the presence of methanol and ruthenium chloride to provide 1,1,9,9-tetramethoxynonane. The rates of reaction are increased by pre-formation of 1,1,9-trimethoxy-7-nonene and removal of the water generated prior to c... | 04/14/1987 |
| 4593135 | Method for promoting the activity and/or extending the life of cation-exchangeable layered clay catalysts in proton-catalyzed reactions A method for promoting the activity and/or extending the life of a cation-exchangeable layered clay catalyst in reactions susceptible to catalysis by protons which method comprises the addition to the catalyst of water as the sole additive. The quantity o... | 06/03/1986 |
| 4579979 | Method for preparation of acetals A method of preparation for acetals utilizing saturated or unsaturated aldehydes, in particular, the preparation of dimethylacetals of acetaldehyde, acrolein and methacrolein. The production of the acetal takes place in a liquid phase in the presence of a... | 04/01/1986 |
| 3969416 | Preparation of ketals An unsaturated compound of formula ##EQU1## in which R1 and R3 represent alkyl groups of 1 to 4 carbon atoms and XH is R2 which represents a primary or secondary alkyl group of 1 to 4 carbon atoms, is reacted with an ... | 07/13/1976 |
