A New Method for Synthesis of Methyl 3—Azido—3—deoxy—2—O—mesyl—5—O—benzoylxylofuranoside

A new method for synthesis of 3-azido-3-deoxyxylofuranoside was described. D-ribose was methylated, then treated with methanesulfonyl chloride to give Ⅱ.Ⅱ was selectively replaced by benzoate at the 5-position to give Ⅲ. All these processes gave good yields. Ⅲ was treated with sodium azide to afford Ⅳ, whose structure was determined by ^1H NMR and ^13C NMR.     

Fe—Ce—N—O,Fe—Y—N—S溶液的热力学研究

本文主要研究了在1570～1650℃范围内Fe-Ce-N-O、Fe-Y-N-S溶液的热力学性质,得到主要结果如下:(1)铈、钇增加氮的溶解度,氧轻微地增加氮的溶解度,硫轻微地减少氮的溶解度;(2)铈、钇、氧、硫与氮的相互作用系数与温度的关系。e_N~(Ce)=(-6230/T) 2.670,e_N~Y=(-6640/T) 2.986,e_N~O=(-3497/T) 1.650,e_N~S=264/T-0.128;(3)铈、钇脱氮产物为CeN、YN;(4)铈、钇脱氮常数与温度的关系:1gK_(CeN)-(-20960/T) 7.972,1gK_(YN)=(-20440/T) 7.863。     

Dynamic Structure of Mo—O Species in Ag—Mo—P—O Catalyst for Oxidative Dehydrogenation of Propane

The dynamic structure of Mo-O species in Ag-Mo-P-O catalyst was studied by in situ confocal microprobe laser Raman spectroscopy (LRS) and catalytic test. The results indicate Mo-O species of MoO3 transformed to Mo-O species of AgMoO2PO4 in C3H8/O2/N2(3/14) flow at 773K. This behavior is closely relative to oxidative dehydrogenation of propan and intrinsic properties of Mo-O species. The Mo-O species of AgMoO2PO4 may be active species for oxidative dehydrogenation of propane.     

Structures of N—（2,3,4,6—Tetra—O—acetyl—β—D—glycosyl） thiocarbamic Benzoyl Hydrazine

The crystal structure of N-(2,3,4,6-tetra-O-acetyl-β-D-gly-cosyl)-thiocarbamic benzoyl hydrazine(C22H27N3O9S) was determined by X-ray diffracton method.The hexopyranosyl ring adopts a chair conformation.All the ring substituents are in the equatorial positions.The acetoxyl-methyl group is in synclinal conformation.The S atom is in synperiplanar conformation while the benzoyl hydrazine moiety is anti-periplanar.The thiocarbamic moiety is almost companar with the benzoyl hydrazine group.There are two intramolecular hydrogen bonds and one intermolecular hydrogen bond for each molecule in the crystal structure.The molecules form a network structure through intermolecular hydrogen bonds.     

制备1—氰基—2,3,5—三—O—苯甲酰基—β—D—呋喃核糖的简便方法

制备１┐氰基┐２，３，５┐三┐Ｏ┐苯甲酰基┐β┐Ｄ┐呋喃核糖的简便方法张万轩＊雷策南黄锦霞陈家威（湖北大学化学系武汉４３００６２）关键词鸟苷，制备，氰基三苯甲酰基－β－Ｄ－呋喃核糖，三甲基氯硅烷１９９６－０８－１２收稿，１９９７－０３－０５修回１－氰...     

The Preparation of 2—O—Acetonyl—β—cyclodextrin as One Key Intermediate for Water Soluble β—Cyclodextrin Derivatives

2－O－Acetonyl-β-cyclodextrin with a suitable average substitution degree of about 5.8, which could be used as a key intermediate for water soluble functional β-cyclodextrin derivatives, was prepared based on the proper oxidation of heptakis(6-O-dimethyl-tert-butylsilyl)-2-O-hydroxypropyl-β-cyclodextrin.     

TMAOH—P2O5—Al2O3—SiO2—H2O—HF体系分子筛的合成研究

以H_3PO_4、水铝石和硅溶胶为原料,四甲基氢氧化铵(TMAOH)为模板剂,在HF参与下水热晶化出含磷P型沸石和SAPO-20分子筛,得到2种分子筛的生成相区,并用~(31)P和~(29)Si MASNMR方法研究了杂原子的取代方式。