CAS: 13709-94-9; Potassium Metaborate

相似化合物

13453-69-5 10555-76-7 7775-19-1

上下游产品

CAS号13675-18-8 四羟基二硼烷 | CAS号13703-95-2 Trifluoroboroxine | CAS号14075-53-7 氟硼酸钾

专利信息

专利号:US-8766002-B2
优先权日:2009-11-26
标题:Preparation and purification of iodixanol
发明人：HU ZHIQI; ZHANG HUOYING
权利人:HU ZHIQI; ZHANG HUOYING; IMAX DIAGNOSTIC IMAGING HOLDING LTD
摘要:An improved synthesis method for preparation of iodixanol, and a purification process through macroporous adsorption resin chromatographic column and recrystallization are provided. The synthesis method relates to dimerization of 5-acetamido-N,N′-bis(2,3-dihydroxypropyl)-2,4,6-triiodo-isophthalamide (compound A) to prepare iodixanol, wherein excessive side reactions such as alkylation are effectively inhibited by controlling the pH of the reaction mixture with a boron-containing acidic substance or salts thereof such as boric acid. In this way, the conversion rate of compound A to iodixanol is 85-90%. The iodixanol crude product is purified by a macroporous adsorption resin chromatographic column, obtaining iodixanol product with recovery of 90-95% and purity of 96-98%. The iodixanol crude product is recrystallized in mixed solvent containing 2-methoxyethanol, obtaining iodixanol product with recovery of 90-95% and purity of greater than 99%.

专利号:US-10968173-B2
优先权日:2016-07-07
标题:Thiocarbonylthio compounds as chain transfer agents suitable for raft polymerization
发明人：COCHRAN ERIC W; HERNANDEZ NACU; FORRESTER MICHAEL; HOHMANN AUSTIN
权利人:UNIV IOWA STATE RES FOUND INC
摘要:The present invention relates to a compound having the structure of formula (I), wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are as described herein. The present invention also relates to a process for the preparation of a compound of formula (I) and to a process for the synthesis of a polymer using the compound of formula (I) through controlled free radical polymerization.

专利号:US-5322942-A
优先权日:1991-06-03
标题 :Synthesis of optically active lactones from L-aspartic acid and intermediates thereof
发明人：RAPOPORT HENRY; DENER JEFFREY M; ZHANG LIN-HAU
权利人:UNIV CALIFORNIA
摘要:Optically active lactones are described, such as an intermediate lactone having the formula ##STR1## where R and R 2 are each independently alkyl with 1 to 6 carbon atoms, cycloalkyl with 6 to 10 carbon atoms, aryl with 6 to 10 carbon atoms, or arylalkyl with 7 to 19 carbon atoms, R 4 is H or C 1-6 alkyl, and Ar is a homo- or heteroaromatic ring with 5 or 6 ring atoms being optionally substituted by C 1-6 alkyl or alkoxy groups, halogen atoms, cyano or nitro groups. Such optically active, intermediate lactones are prepared from L-aspartic acid, and can be readily converted to (+)-pilocarpine and its analogues by hydrolysis, reduction, and hydrogenation, such as to an optically active lactone having the formula ##STR2## which is (+)-pilocarpine when R is ethyl, R 4 is H, and Ar is 1-methylimidazol-5-yl.

专利号:WO-2022196043-A1
优先权日:2021-03-17
标 题:Method for producing zeolite
发明人：IKEHARA YUYA; TANAKA KEISUKE; MURAKAMI MASAYOSHI; SEKI KOHEI
权利人:SUMITOMO CHEMICAL CO
摘要:The present invention further improves the selectivity of ε-caprolactam.　This method is for producing zeolite and comprises steps (1)-(5).　Step (1): A step for mixing tetraalkyl orthosilicate, water, and a hydroxylated quaternary ammonium to obtain a mixture. Step (2): A step for, while causing the mixture obtained in step (1) to undergo a hydrothermal synthesis reaction, supplying, to the mixture, at least one compound (A) selected from the group consisting of boron compounds, germanium compounds, magnesium compounds, aluminum compounds, tin compounds, and iron compounds to obtain a reaction mixture containing zeolite crystals. Step (3): A step for performing solid-liquid separation on the reaction mixture containing zeolite crystals obtained in step (2), to obtain zeolite crystals. Step (4): A step for sintering the zeolite crystals obtained in step (3). Step (5): A step for bringing the zeolite crystals sintered in step (4) into contact with an aqueous solution containing at least one acid selected from the group consisting of inorganic acids and organic acids to obtain zeolite.