| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 549456000 |
Polycyclo ring system having the hetero ring as one of the cyclos
| 158 |
| 549483000 |
Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring
| 136 |
| 549430000 |
Plural ring oxygens in the hetero ring
| 57 |
| 549497000 |
Chalcogen attached indirectly to the hetero ring by nonionic bonding
| 33 |
| 549475000 |
Chalcogen bonded directly to the hetero ring
| 19 |
| 549505000 |
Plural double bonds between ring members of the hetero ring
| 16 |
| 549491000 |
Nitrogen attached indirectly to the hetero ring by nonionic bonding
| 14 |
| 549472000 |
Plural hetero rings
| 12 |
| 549509000 |
Preparing from a hydroxy containing compound
| 7 |
| 549508000 |
Preparing from compound containing -COO- group | 3 |
| 20090287004 | Method of Converting a Polyol to an Olefin - A method of preparing an olefin comprising: reacting a polyol in the presence of a carboxylic acid, such that an olefin is produced by the deoxygenation of the polyol. The reacting step can comprise (a) providing a composition comprising the polyol, (b) heating the composition, and (c) introducing the carboxylic acid to the composition wherein the introducing step occurs prior to, at the same time as, or subsequent to the heating step. In one embodiment, the polyol is glycerol, the carboxylic acid is formic acid, and the olefin is allyl alcohol, which is produced at a yield of about 80% or greater. | 11-19-2009 |
| 20110092721 | PROCESS - A process for activating a reduced manganese copper catalyst comprising treating the catalyst at a temperature of more than 300° C. to about 400° C. with hydrogen. | 04-21-2011 |
| 20110245517 | PROCESS FOR PREPARING TETRAHYDROFURAN - The present invention relates to a process for preparing tetrahydrofuran by absorption of C | 10-06-2011 |
| 549507000 |
One double bond between ring members of the hetero ring | 3 |
| 20090131691 | Production of 2,5-Dihydrofurans and Analogous Compounds - Vinyl oxiranes are rearranged to 2,5-dihydrofuran using catalyst (III) or (IV). The 2,5-dihydrofuran can be reduced to tetrahydrofuran. 3,4-Epoxy-1-butene substrate is converted to 2,5-dihydrofuran which in turn is converted to tetrahydrofuran. Substrate for making 3-methyltetrahydrofuran is prepared from isoprene. Substrate for making 2-methyltetrahydrofuran is prepared from piperylene. Reactions analogous to that with vinyl oxiranes are carried out with vinyl thiiranes and vinyl aziridines. | 05-21-2009 |
| 20110190516 | METHOD FOR PRODUCING VINYL ETHER COMPOUND - The invention provides a method for producing a vinyl ether compound, characterized in that the method includes isomerizing an allyl ether compound represented by formula (I) or (II): | 08-04-2011 |
| 20150105567 | OPTICALLY ACTIVE AXIALLY CHIRAL ALPHA-ALLENIC ALCOHOL, SYNTHESIS METHOD AND USE THEREOF - The present invention relates to an optically active axially chiral α-allenic alcohol, a synthetic method and use thereof. A method of preparing a high optically active chiral α-allenic alcohol by using propargyl alcohol, aldehyde and chiral α,α-diphenyl-L-prolinol under the protection of tert-butyldimethylsilyl with a mediator zinc bromide. The axially chiral α-allenic alcohol has the structural formula (I). The method of the present invention has the following advantages: the synthesis route is short, operations are simple, raw materials are readily available, separation and purification are convenient, the substrate has high generality, the total yield is high, and enantioselectivity and diastereoselectivity are high. The high optically active axially chiral α-allenic alcohol synthesized by adopting the method of the present invention can conveniently synthesize 2,5-dihydrofuran compounds having central chirality via complete chirality transfer, and at the same time can further be used to synthesize axially chiral allenic amine and allenic malonate compounds without reacemization. | 04-16-2015 |
| 549474000 |
Cyano bonded directly to the hetero ring | 2 |
| 20140171663 | PROCESS FOR PRODUCING COMPOUNDS COMPRISING NITRILE FUNCTIONS - The present invention relates to the production of compounds comprising nitrile functions and of cyclic imide compounds. It relates more particularly to the production of compounds comprising nitrile functions from compounds comprising carboxylic functions, advantageously of natural and renewable origin, and from 2-methylglutaronitrile (MGN) or a mixture N of dinitriles comprising 2-methylglutaronitrile (MGN), 2-ethylsuccinonitrile (ESN) and adiponitrile (AdN). | 06-19-2014 |
| 20140343304 | METHOD FOR MANUFACTURING COMPOUNDS INCLUDING NITRILE FUNCTIONS - The present invention relates to the manufacture of compounds of general formula I or III including nitrile functions. Specifically, the invention relates to the manufacture of compounds including nitrile functions from compounds which include carboxyl functions and which are advantageously of natural and renewable origin. | 11-20-2014 |
| 549480000 |
Nitrogen bonded directly to the hetero ring | 2 |
| 20080255377 | Processes for the Manufacture of Chiral and Racemic Forms of 3-Aminotetrahydrofurans, Their Salts and Derivatives - A novel process for the synthesis of (S)-3-Amino-tetrahydrofuran and (R)-3-Amino-tetrahydrofuran is described. The process is applicable for substituted chiral-3-aminotetrahydrofuran derivatives. | 10-16-2008 |
| 20100286415 | SLEEP-IMPROVING AGENT - The invention provides a sleep-improving agent and a sedative agent containing, as an active ingredient, oxypinnatanine or its derivative represented by the following chemical formula (I): | 11-11-2010 |
| Entries |
| Document | Title | Date |
|---|
| 20100048922 | PROCESS FOR ONE-STAGE PREPARATION OF 2-METHYLTETRAHYDROFURAN FROM FURFURAL OVER TWO CATALYSTS IN A STRUCTURED BED - The present invention provides a process for preparing 2-methyltetrahydrofuran by one-stage hydrogenation of furfural with a hydrogen-comprising gas in the presence of a structured bed of at least one copper catalyst and at least one catalyst which comprises at least one noble metal from groups 8, 9 and/or 10 of the periodic table of the elements applied on a support material. | 02-25-2010 |
| 20100099895 | PROCESS FOR ONE-STAGE PREPARATION OF 2-METHYLTETRAHYDROFURAN FROM FURFURAL OVER A CATALYST - The present invention provides a process for preparing 2-methyltetrahydrofuran by one-stage hydrogenation of furfural with a hydrogen-comprising gas in the presence of a supported catalyst which comprises at least one noble metal from groups 8, 9 and/or 10 of the periodic table of the elements. | 04-22-2010 |
| 20100298583 | METHOD FOR THE DEPOLYMERIZATION OF MIXTURES THAT CONTAIN MONO-AND/OR DIESTERS OF POLYTETRAHYDROFURANE - The present invention provides a process for depolymerizing mixtures comprising mono- and/or diesters of polytetrahydrofuran in the presence of an acidic catalyst and of a C | 11-25-2010 |
| 20120035378 | HYDROGENATION PROCESS FOR THE PREPARATION OF TETRAHYDROFURAN AND ALKYLATED DERIVATIVES THEREOF - A process is provided for the synthesis of tetrahydrofuran and related compounds by hydrogenation of furan and derivatives, using a sponge nickel catalyst that has been promoted with iron and chromium. | 02-09-2012 |
| 20130053583 | DEPOLYMERIZATION OF OLIGOMERIC CYCLIC ETHERS - The present invention provides a method for depolymerization of a mixture comprising oligomeric cyclic ethers resulting from copolymerization of at least one tetrahydrofuran and at least one other cyclic ether to recover tetrahydrofuran monomer. | 02-28-2013 |
| 20150299153 | Continuous Processing Method of 2-methyltetrahydrofuran - The disclosure claims a continuous processing method of 2-Methyltetrahydrofuran (2-MeTHF), including the steps as follows: introducing gasification furfural and hydrogen into a first reaction zone and processing a first catalytic hydrogenation reaction; introducing the gas which is output from the first reaction zone to a second reaction zone to implement a secondary catalytic hydrogenation reaction; and condensing the gas output from the second reaction zone to obtain the 2-MeTHF; wherein, the first reaction zone is filled with a catalyst which is used for aldehyde group reduction, and the second reaction zone is filled with the catalyst for aromatic saturation hydrogenation. By adopting the low-toxicity catalyst which is cheap and easy to get, the high-purity 2-MeTHF can be produced by implementing the gas-phase continuous reaction by the furfural under low pressure or ambient pressure, the traditional process which has high pressure, high investment and high risk can be changed. | 10-22-2015 |
| 20150368216 | SINGLE STEP PROCESS FOR CONVERSION OF FURFURAL TO TETRAHYDROFURAN - The present patent discloses a one step process for the synthesis of THF and related ring hydrogenated products form furfural using Palladium metal based carbon supported catalyst with high selectivity and 100% conversion in both batch and continuous modes. | 12-24-2015 |
| 20160107966 | PROCESS FOR THE SEPARATION OF 1,4-BUTANEDIOL AND CO-PRODUCTS - The present invention provides a process for the recovery of 1,4-butanediol and at least one co-product selected from γ-butyrolactone, n-butanol and tetrahydrofuran from an aqueous stream, said process comprising the steps of providing the aqueous stream, providing a first solvent stream, combining said aqueous stream with said first solvent stream and recovering at least a portion of the 1,4-butanediol and at least a portion of at least one of the co-products by liquid-liquid extraction. | 04-21-2016 |
