CAS: 20881-04-3; (3Ar,3Bs,7Ar,8Ar)-2,2,5,5-Tetramethyltetrahydro-7H-[1,3]Dioxolo[4',5':4,5]Furo[3,2-D][1,3]Dioxine

相似化合物

131156-47-3 17682-70-1 158702-89-7

上下游产品

CAS号67-64-1 丙酮 | CAS号58-86-6 D-木糖 | CAS号87-72-9 L-阿拉伯糖 | CAS号6763-34-4 D-木糖 | CAS号116-11-0 2-甲氧基丙烯 | CAS号77-76-9 2,2-二甲氧基丙烷 | CAS号133-99-3 D(+)-纤维二糖 | CAS号50-99-7 D(+)-无水葡萄糖 | CAS号75935-47-6 10-(phenylthio)... | CAS号20590-53-8 1,2-O-Isopropyl... | CAS号50-89-5 beta-胸苷 | CAS号87-72-9 L-阿拉伯糖 | CAS号58-86-6 D-木糖 | CAS号20031-21-4 1,2-O-异亚丙基-alph... | CAS号29581-01-9 a-D-Xylofuranos... | CAS号22423-26-3 2,2'-脱水-5-甲基尿苷 | CAS号6612-91-5 (R)-5-O-Benzoyl... | CAS号95585-76-5 2-溴-2-脱氧-5-甲基脲啶...

D-木糖置于ethyl Metaphosphate,丙酮体系中,化学反应生成1,2:3,5-双-O-异亚丙基-Alpha-D-呋喃木糖
参考文献:Pacak; Cerny,Collection Of Czechoslovak Chemical Communications,1959,Vol. 24,P. 3804
标题:Pacak; Cerny,Collection Of Czechoslovak Chemical Communications,1959,Vol. 24,P. 3804

专利信息

专利号:US-4681936-A
优先权日:1985-02-15
标 题:Preparation of sugar ketals
发明人：PFAFF KLAUS-PETER; PAUST JOACHIM; HARTMANN HORST
权利人:BASF AG
摘要:Sugar ketals are prepared by reacting a sugar with a ketone in the presence of an acid catalyst by a process in which n A. a molecular boron trifluoride compound or trifluoromethanesulfonic acid is used in an amount of only from 0.01 to 10% by weight, based on the sugar used, n B. up to a 30-fold molar excess of the ketone is used and n C. the water formed during the reaction is removed continuously from the reaction mixture. n In a particularly advantageous embodiment of the process, the boron trifluoride is used in the form of boron trifluoride etherate and, when the reaction is complete, this compound or the trifluoromethanesulfonic acid is rendered ineffective under non-aqueous conditions, after which the ketone is evaporated off and the reaction mixture is then subjected to fractional distillation. The process is particularly important for the reaction of L-sorbose with acetone to obtain 2,3:4,6-di-O-isopropylidene-L-sorbofuranose, which is required for the synthesis of ascorbic acid.

专利号:US-6090950-A
优先权日:1996-08-23
标 题 :Chiral hydride complexes
发明人：HEISE GLENN L
权利人:ZEELAND CHEMICALS INC
摘要:Novel chiral boron and aluminum hydride complexes, compositions comprising the chiral hydride complexes, and methods for their synthesis and use are described. The novel chiral hydride complexes are of the formulas: MBH4-n-a(R*)n(R')a; MBH2-b(R**) (R')b; MBH(R***); MBH(R*) (R''); MAlH4-n-a(R*)n(R')a; MAlH2-b(R**)(R')b; MAlH(R***); and MAlH(R*) (R''), wherein M is Na+, Li+ or K+; each R* is independently a monodentate chiral ligand; R** is a bidentate chiral ligand; R*** is a tridentate chiral ligand; R' is a monodentate achiral ligand; R'' is a bidentate achiral ligand; n is 1-3; a is 0-2; and b is 0-1, with the proviso that n+a
专利号:RU-2108339-C1
优先权日:1994-09-27
标 题 :Method of synthesis 2'-deoxyxylothymidine, derivatives of d-xylofuranose, derivatives of xylothymidine