Class / Patent application number | Description | Number of patent applications / Date published |
549519000 | Carbonyl of aldehyde or ketone reacted to form oxirane ring | 8 |
20080249324 | Process For Preparing 1,3-Dibromoacetone, 1-3-Dichloroacetone and Epichlorohydrin - A process for preparing 1,3-dibromoacetone, 1-3-dichloroacetone and epichlorohydrin which comprises: (a) reacting acetone with 2 moles of bromine to make a mixture of brominated acetone derivatives and byproduct hydrogen bromide; (b) equilibrating the mixture of brominated acetone derivatives and hydrogen bromide to produce 1,3-dibromoacetone as the major product; (c) crystallizing the 1,3-dibromoacetone; and (d) isolating the 1,3-dibromoacetone. The process may further include the steps of (e) reacting the 1,3-dibromoacetone with a chloride source to produce 1,3-dichloroacetone; (f) hydrogenating the isolated 1,3-dichloroacetone to produce 1,3-dichlorohydrin; and (g) cyclizing the 1,3-dichlorohydrin with a base to produce epichlorohydrin. | 10-09-2008 |
20090018354 | PREPARATION OF ALPHA-HYDROXY AND ALPHA-AMINO KETONES - A process for the preparation of an 1,1-disubstituted oxirane is disclosed, wherein an organic sulphide is reacted in a polar solvent with an educt containing a leaving group attached to a primary or secondary carbon atom, and/or the sulfonium salt formed in this way is reacted with a ketone in presence of a base and a polar solvent. Oxiranes of the type obtained may be further converted into the corresponding α-hydroxyketone or α-aminoketone, either in one step by subjecting to aerobic oxidation in the presence of a transition metal catalyst, or in two steps by hydrolyzation in the presence of an aqueous acid to the corresponding dialcohol and subsequent selective oxidation. Further described are some novel epoxide intermediates. The α-hydroxyketones and α-aminoketones thus obtainable are useful inter alga as photoinitiators. | 01-15-2009 |
20090287006 | Process for the preparation of an epoxy compound and an aldehyde - The invention relates to a process comprising a condensation step wherein a starting aldehyde or ketone is made to react with an ester of an α-haloacid to form an epoxy compound, whereby the reaction is carried out in the presence of a dipolar aprotic compound selected from the group consisting of 1-methyl-2-pyrrolidone (NMP), hexamethylphosphorous triamide (HMPT), dimethylsulfoxide (DMSO), and urea derivatives of the following formula: (III) wherein R | 11-19-2009 |
20110009650 | METHOD FOR PRODUCING CHIRAL ALPHA,BETA-EPOXY KETONES - A process is claimed for the enantioselective epoxidation of α,β-unsaturated ketones, in which a compound of the general formula I, | 01-13-2011 |
20110124891 | ALPHA-PENTAFLUOROSULFANYL ALDEHYDES, KETONES AND ACIDS - Compounds of formula (I): are disclosed. In these compounds Y is —CH(OH)—, —CH(NHR | 05-26-2011 |
20120289721 | PREPARATION OF ALPHA-HYDROXYKETONES - A process for the preparation of an 1,1-disubstituted oxirane is disclosed, wherein an organic sulphide is reacted in a polar solvent with an educt containing a leaving group attached to a primary or secondary carbon atom, and/or the sulfonium salt formed in this way is reacted with a ketone in presence of a base and a polar solvent. Oxiranes of the type obtained may be further converted into the corresponding α-hydroxyketone or α-aminoketone, either in one step by subjecting to aerobic oxidation in the presence of a transition metal catalyst, or in two steps by hydrolyzation in the presence of an aqueous acid to the corresponding dialcohol and subsequent selective oxidation. Further described are some novel epoxide intermediates. The α-hydroxyketones and α-aminoketones thus obtainable are useful inter alia as photoinitiators. | 11-15-2012 |
20130274488 | PROCESS FOR PREPARING AN EPOXIDE - A mixture of compounds containing 1,3-dichloropropan-2-ol, 2,3-dichloropropan-1-ol, and a halogenated ketone, where the halogenated ketone content of the mixture is at least 0.0001% by weight and less than or equal to 0.1% by weight relative to the 1,3-dichloropropan-2-ol and 2,3-dichloropropan-1-ol. | 10-17-2013 |
20140316149 | ALDEHYDE-SELECTIVE WACKER-TYPE OXIDATION OF UNBIASED ALKENES - This disclosure is directed to methods of preparing organic aldehydes, each method comprising contacting a terminal olefin with an oxidizing mixture comprising:
| 10-23-2014 |