- Method for preparation of 2, 5-furandicarboxylic acid diester compound from 5-hydroxymethylfurfural
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The invention discloses a method for preparation of a 2, 5-furandicarboxylic acid diester compound from 5-hydroxymethylfurfural. The method uses a cheap and specific non-noble metal as the catalyst, and adopts cheap and easily available oxygen or air as an oxygen source to prepare high purity dimethyl furan-2, 5-dicarboxylate at high efficiency under mild reaction conditions, thus solving the problems of low reaction efficiency, low product yield, high cost and the like in the prior art, and has good application prospects.
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Paragraph 0025-0026; 0034-0035
(2019/12/31)
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- Processes and catalysts for conversion of 2,5-dimethylfuran derivatives to terephthalate
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A process of making terephthalic acid or a derivative of terephthalic acid is described. The process includes reacting a derivative of 2,5-dimethylfuran, with a dienophile containing an unsaturated 2-carbon unit, in the presence of a catalyst having Br?nsted acidity to form a para-xylene derivative; and optionally reacting the para-xylene derivative to terephthalic acid.
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Page/Page column 10-12; 14
(2016/05/19)
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- METHODS FOR PREPARING 2,5-FURANDICARBOXYLIC ACID
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Provided are methods of producing 2,5-furandicarboxylic acid (FDCA) from renewable sources such as seaweed, alginate, oligoalginate, pectin, oligopectin, polygalacturonate, galacturonate, and/or oligogalacturonate. The sugars in the renewable sources can be converted into one or more intermediates such as 4-deoxy-L-erythro-5- hexoseulose uronate (DEHU), 4-deoxy-L-threo-5-hexosulose uronate (DTHU), 5- hydroxymethyl furfural (HMF), 2,5-dihydroxymethyl furan (DHMF), and 5-formyl-2- furancarboxylic acid (FFA), which can be converted into FDCA by dehydration and cyclization to produce 5-formyl-2-furancarboxylic acid (FFA), followed by oxidation to produce FDCA. DEHU or DTHU may also be converted into FDCA by oxidation to produce 2,3-dihydroxy-5-oxohexanedioic acid (DOHA), which then undergoes dehydration and cyclization to produce FDCA.
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Paragraph 0265; 0266: 0267; 0268
(2013/04/13)
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- Binuclear biscarbene complexes of furan
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Carbene complexes of chromium and tungsten with a bridging furan substituent were synthesized from lithiated furan precursors and metal hexacarbonyls. The binuclear biscarbene complexes [(CO)5M{C(OEt)- C4H2O-C(OEt)}-M′(CO)5] (M = M′ = Cr (3), W (4)) were obtained as well as the corresponding monocarbene complexes [M{C(OEt)-C4H3O}(CO)5] (M = Cr (1), W (2)). A method of protecting the carbene moiety during the metal acylate stage was used to increase not only the yields of the binuclear Fischer biscarbene complexes 3 and 4 but to establish a method to synthesize analogous mixed heterobinuclear carbene complexes (M = W, M′ = Cr (5)) in high yields. The binuclear biscarbene complexes 3 and 5 were reacted with 3-hexyne and yielded the corresponding benzannulated monocarbene complexes [M{C(OEt)-C14H 17O3}(CO)5] (M = Cr (6), W(7)). Complex 5 reacted regioselectively with the benzannulation reaction occurring at the chromium-carbene centre. The major products from refluxing 3 in the presence of [Pd(PPh3)4] were a monocarbene-ester complex [Cr{C(OEt)-C4H2O-C(O)OEt}(CO)5] (8), the 2,5-diester of furan (9) and a carbene-carbene coupled olefin EtOC(O)-C 4H2O-C(OEt)=C(OEt)-C4H2O-C(O)OEt (10). X-Ray structure analysis of 4 and 6 confirmed the molecular structures of the compounds in the solid state and aspects of electron conjugation between the transition metals and the furan substituents in the carbene ligands were investigated. The Royal Society of Chemistry 2005.
- Crause, Chantelle,Goerls, Helmar,Lotz, Simon
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p. 1649 - 1657
(2007/10/03)
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