2，3，6，3′，4′-五氧乙酰基蔗糖的合成与表征

三氯蔗糖;6-pas;合成;高效液相色谱     

Crystal Structure of D-Valine at the Temperature of 293, 270, 223 and 173K

1 INTRODUCTION D-amino acids are universally present and play different biological roles in various organisms in- cluding those in the human body. Milton[1] has shown that the D and L forms of the enzyme HIV-1 protease were equally affected by the achiral inhi- bitor but displayed reciprocal chiral specificity in their biochemical interactions. D-proteins may also be nonimmunogenic. Senility and some diseases are related to D-amino acids, such as renal disease[2], Alzheimer disease[3…     

Synthesis and Crystal Structure of 9-Pyridyl-1,8-dioxo-2,3,4,5,6,7-hexahydroxanthene

1 INTRODUCTION The Koevenagel condensation catalyzed by bases or Lewis acid has been the subject of many synthetic applications since its discovery[1] although the pre- sence of catalyst is not always indispensable[2]. Mo- reover, the reaction of aromatic aldehyde with 1,3- cyclohexanedione under different conditions afforded different products[3～6]. In continuing efforts for the application of 1,3-cyclohexanedione derivatives to construct new heterocycles with biological activi- ties[7…     

A Novel Platinum（Ⅳ） Halide Anion as Ethyl-triphenylphosphenonium Salt： Synthetic, Structural and Theoretical Study

1 INTRODUCTION The importance of metal ions in nucleic acid and other biologic processes has stimulated considerable research interest in the area of metal interactions with nuclei acid constituents[1, 2] due to the discovery that some platinum compounds, especially cis-Pt (NH3)2- Cl2, exhibit carcinostatic properties[3]. This has led to an increased research activity in the chemistry and structures of platinum complexes containing novel or- ganic ligands. And crystal engineering has its…     

Structural and Spectroscopic Properties of Linear Carbon Chains NC2nN and HC2n＋1N （n = 1- 10）

1 INTRODUCTION Carbon-chain species are widely present in the interstellar medium as possible carriers of the diffuse interstellar bands. They play an important role in diverse chemical processes and nanoscience as intermediates and building units. Because of their high reactivity, bare carbon chains are readily termi- nated by a wide variety of atoms, forming XCn or XCnX linear clusters[1]. During the past decade, lots of theoretical spectra of different carbon chain systems have been …     

Hydrothermal Assembly and Structural Characterization of a Novel 3D Coordination Polymer: [Cd_2Zn(BTC)_2(H_2O)_4]_n·2nH_2O

1INTRODUCTIONThehydrothermalsynthesisofmetalsaltsofaro-maticpolycarboxylicacidisattractinginterestinthefieldofcrystalengineeringasaconsequenceoftheirnovelstructuresandpropertiessuchasporosityandmagneticinteractionsbetweenparamagneticmetal-ions[1~7].1,3,5-Benzenetricarboxylicacid(H3-BTC)hasreceivedconsiderableattentionasatridentatearomaticpolycarboxylicligandcapableofformingcoordinationpolymers.Manyscientistshavesuc-ceededinsynthesizingvarietyofporouscoordina-tionpolymerswithhighdimension…     

N-(1, 3, 4-噻二唑-2-基)-N′-芳酰基脲的合成及其生物活性

N-(1;3;4-噻二唑-2-基)-N′-芳酰基脲的合成及其生物活性;噻二唑;芳酰基脲;合成;生物活性;植物生长调节剂     

QSPR Studies on lgK_(ow) and lgK_(oc) of Fluorobenzenes and Property Parameters Based on HF and DFT Calculations

1 INTRODUCTION Quantitative structure-activity relationship (QSAR) equation could be employed to predict the biological activities of unknown compounds, which is signifi- cant for initial screening and evaluation of toxic compounds[1]. Soil sorption coeff…     

Electron Ionization Mass Spectrometry of Some Ferrocenyl Thia-crown Ethers

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Theoretical Study on the Reaction Mechanism of F2 ＋ 2HBr = 2HF ＋ Br2

1 INTRODUCTION The replacement reactions between halide and hy- drogen halide, or halide and halide are basic reac- tions in chemistry. Goldfinger et al. have speculated by experiment that the gas reaction between chlorine and hydrogen bromide might be a two-step intermo- lecular reaction[1, 2]. But gas reactions between other halides and hydrogen halides haven’t been reported experimentally so far. About theoretical investiga- tion, colinearity quantum mechanics, vibrational tran- sitio…