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981.
The structure of the strongly cytotoxic marine alkaloid halitulin (1) has been confirmed by total synthesis and its absolute configuration determined as (15S). The synthesis follows a strategy previously reported by one of us and uses an efficient preparation of the quinoline-7,8-diol unit by modified Baeyer-Villiger and Skraup reactions. The O-benzyl protecting groups were removed in the last step of the synthesis by transfer hydrogenolysis without concomitant reduction of the quinoline ring. The method can be applied for the synthesis of halitulin analogues. 相似文献
982.
Mingdeng Wei Kiyomi Okabe Hironori Arakawa Yesutake Teraoka 《Reaction Kinetics and Catalysis Letters》2002,77(2):381-387
SiO2 was modified by hexagonal mesoporous silica to form a mixture with meso-/macroporous sizes and used as support of Co catalysts for Fischer-Tropsch synthesis in a slurry phase. A synergistic effect on the activity of Co catalyst was found. The catalytic properties are related to the state of surface Co and the character of support. 相似文献
983.
Cebulak S. Langier-Kuüniarowa A. Grotek I. 《Journal of Thermal Analysis and Calorimetry》2002,69(1):227-235
Oxyreactive thermal analysis (OTA) carried out in the conditions of full access of oxygen to each reacting particle of the sample investigated is a suitable method for the determination of important properties of the organic matter dispersed in the rocks. Its results may be easily evaluated to the form of values to be used in a clear diversification and classification system of organic matter/kerogen, as well as to the evaluation of its transformation process in a rockmass. The OTA also enables the distinguishing of the transformation stages and the investigation of the results of the gaseous products liberation from organic matter and kerogen. The OTA method may be applied as a complementary one for the Rock Eval analysis and be used for the organic geochemical and bituminological studies for geological bitumen prospecting.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
984.
M. N. Repkova M. I. Meshchaninova T. M. Ivanova N. I. Komarova D. V. Pyshnyi A. G. Venyaminova 《Russian Chemical Bulletin》2002,51(7):1194-1197
A solid-phase H-phosphonate procedure was developed for the synthesis of oligoribonucleotides containing aliphatic amino linkers with different lengths at the N(4) atom of cytosine. The hybridization properties of modified oligoribonucleotides were studied. Thermal stability of the RNA—RNA* and DNA—RNA* duplexes depends on the position of modified cytosine in the chain and the type of the duplex. 相似文献
985.
Ben Salah M Vilminot S André G Richard-Plouet M Bourée-Vigneron F Mhiri T Kurmoo M 《Chemistry (Weinheim an der Bergstrasse, Germany)》2004,10(8):2048-2057
[Mn(3)(OH)(2)(SO(4))(2)(H(2)O)(2)] and its deuterated analogue were synthesized by a hydrothermal technique and characterized by differential thermal analysis, thermogravimetric analysis, and IR spectroscopy. Its nuclear structure, determined by single-crystal X-ray analysis and Rietveld analysis of neutron powder-diffraction data, consists of a 3D network of chains of edge-sharing Mn(1)O(6), running along the c axis, connected by the apices of Mn(2)O(6) and SO(4) units. It is isostructural to the nickel analogue. Determination of the magnetic structure and measurements of magnetization and heat capacity indicate the coexistence of both magnetic long-range ordering (LRO) and short-range ordering (SRO) below a Néel temperature of 26 K, while the SRO is retained at higher temperatures. The moments of the two independent Mn atoms lie in the bc plane, and that of Mn(1) rotates continuously by 54 degrees towards the c axis on decreasing the temperature from 25 to 1.4 K. While the SRO may be associated with frustration of the moments within a Mn(3) trimer, the LRO is achieved by antiparallel alignment of the four symmetry-related trimers within the magnetic unit cell. A spin-flop field, measured by dc and ac magnetization on a SQUID, is observed at 15 kOe. 相似文献
986.
本文按合成产物的结构类型,综述分子内 Diels-Alder 反应在有机合成方面的新进展。 相似文献
987.
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... 相似文献
988.
β—环糊精对D/L—酪氨酸对映体的手性识别及超分子包合物的合成 总被引:6,自引:0,他引:6
利用圆二色谱研究了β-环糊精(β-CD)对D/L酪氨酸的手性识别行为,制备出了β-CD与L-酪氨酸(L-Tyr)的固体超分子化合物,并用元素分析、薄层分析、X射线粉末衍射及热分析对包合物进行了表征,用荧光光谱法测定了包合物的形成常数.实验结果表明,β-CD具有选择包结L-酪氨酸的特性;主客体形成11的包合物,其组成为L-Tyr/β-CD·12H2O;稳定常数为5.13×103L/mol;包合物的热稳定性比主客体皆有改善 相似文献
989.
990.
Exfoliated polystyrene (PS)/laponite nanocomposites were prepared successfully. The characteristic doo1 diffraction peak of organo-laponite disappeared in the XRD patterns of nanocomposites, indicating that the laponite layers were exfoliated and the ordered crystal structure of laponite was destroyed because of the styrene polymerization. TEM observations showed that the exfoliated laponite primary particles were dispersed randomly in the PS matrix with lateral dimensions from 1 nm to 10 rim. SEM results showed that the PS/laponite nanocomposite particles were almost monodispersed spheres with the size of about 120 rim. Because of the interaction between PS and laponite nanolayers, the nanocomposites exhibited higher thermal stability and glass transition temperature when compared to pure PS. 相似文献