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191.
José Barluenga Prof. Dr. Amadeo Fernández Alejandro Diéguez Dr. Félix Rodríguez Dr. Francisco J. Fañanás Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(43):11660-11667
An efficient method for the synthesis of [3.3.1]bicyclic compounds from easily available alkynol derivatives has been developed. The reaction is based on a gold‐ or platinum‐catalyzed tandem process that involves an intramolecular hydroalkoxylation of a triple bond followed by a Prins‐type cyclization. The reaction has been carried out with differently substituted alkynol derivatives and oxygen‐, nitrogen‐, and carbon‐centered nucleophiles. The incorporation of halogen atoms as nucleophiles and elimination reactions has also been studied. Enantiomerically pure [3.3.1]bicyclic systems were easily synthesized from the chiral pool. 相似文献
192.
Dominique Duchêne Gilles Ponchel 《Journal of inclusion phenomena and macrocyclic chemistry》2002,44(1-4):15-16
The use of nanoparticles is of great interest for oral or parenteral administration. In fact, nanoparticles not only can protect the active ingredient, but they confer on it a large contact surface with biological membranes and a possible improvement in bioavailability. Biodegradability of nanoparticles, which can be considered as a pre-requisite in the case of parenteral administration 相似文献
193.
Gilles Hargé 《Journal of Functional Analysis》2008,254(2):267-300
In this paper, we obtain a reinforcement of an inequality due to Brascamp and Lieb and a reinforcement of Poincaré's inequality for general logarithmical concave measures on Rd. The formula used in the proof is related to theorems concerning the integration of log-concave functions (such as results of Prékopa and of Ball, Barthe and Naor). We also obtain a lower bound for the variance of the same family of measures. 相似文献
194.
ESR波谱和流动-停止UV动力学研究表明,水溶液中2,2,6,6-四甲基-4-羟基哌啶-1-氧自由基1和相应氧铵澳盐2均可将N,N,N′,N′-四甲基对苯二胺(TMPD)氧化为相应自由基正离子TMPD+,2还能将TMPD+进一步氧化为二价正离子TMPD~(2+).TMPD+可发生可逆歧化,其稳定性强烈受介质酸碱性的影响。利用计算机对动力学曲线的模拟测得上述有关反应的速率常数,并讨论了反应机理。 相似文献
195.
We introduce the notion of Γ-Lie bialgebras, where Γ is a group. These objects give rise to cocommutative co-Poisson bialgebras, for which we construct quantization functors. This enlarges the class of co-Poisson algebras for which a quantization is known. Our result relies on our earlier work, where we showed that twists of Lie bialgebras can be quantized; we complement this work by studying the behavior of this quantization under compositions of twists. 相似文献
196.
A series of lanthanide coordination polymers, [LnIII(mal)(ox)0.5(H2O)2]·2H2O (Ln = Pr ( 1 ), Nd ( 2 ), and La ( 3 ); H2mal= maleic acid; H2ox = oxalic acid), were synthesized firstly by the reaction of LnIII nitrate salts with maleic anhydrid and oxalic acid under hydrothermal conditions and were characterized by elemental analysis, IR spectroscopy, and single‐crystal X‐ray diffraction. X‐ray diffraction analyses reveal that they are crystallized in orthorhombic space group Fddd. Lanthanide metal center atom (Ln) and its corresponding centrosymmtric atom link through two chelating/bridging bidentate carboxyl groups of maleic acid ligands to form an infinite inorganic rod‐shaped building unit. These rod‐shaped building units were linked to each other through the carbon atoms of the maleate anions on the [110] plane to form lanthanide‐maleic acid layers. The oxalic acid pillared lanthanide‐maleic acid layers with intersected channels by free water molecules consist of a 3D framework structure. The thermogravimetric analyses of 1 – 3 were discussed in detail. The courses of the thermal decomposition of complexes are similar. 相似文献
197.
M. M. de Faà 《Mathematische Annalen》1878,14(2):241-247
Sans résumé 相似文献
198.
On the basis of the interaction between phonons in ionic crystals with anharmonic lattice vibration, we present a laser model on acoustic nondegenerate four-wave mixing. Two beams of highfrequency ultrasound, incident on the acoustic cavity fulfilled with the medium of ionic crystal, play the role of pumping and one of the two side-band modes of the pumping frequency as an acoustic signal mode has a strong interaction with the optical cavity mode, the coupling-out of which wiIl be the light (far-infrared) output of a laser. The problem is treated with quantum-mechanics. The theory shows that there is the threshold phenomenon as usual lasers and a so called "phase-matching" condition is derived, which should be satisfied for stability of the system. 相似文献
199.
S.Y. Frankie Mak Gary C.H. Chiang James E.P. Davidson John E. Davies Andrew Ayscough Gilles Pain Jonathan W. Burton Andrew B. Holmes 《Tetrahedron: Asymmetry》2009,20(6-8):921-944
The enantioselective synthesis of a number of simplified analogues of the cytotoxic natural product eleutherobin is reported. 相似文献
200.
Min‐Hsien Liu Ken‐Fa Cheng Cheng Chen Yaw‐Sun Hong 《International journal of quantum chemistry》2010,110(4):813-820
Ethene and two kinds of nitrating reagents (HNO3 and N2O5) were included in respective molecular systems, which progressed through a two‐stage electrophilic and free radical nitrosubstitution, resulting in the corresponding nitroethene compounds. Subsequent halogenation (using Cl2 and Br2) and amination (using ammonia) were then performed, also by electrophilic and radical substitution, to produce the target 1,1‐diamino‐2,2‐dinitroethene (FOX‐7) derivatives. All transition state species were identified using a two‐ or three‐structure Synchronous Transit‐Guided Quasi‐Newton between the Cartesian coordinates of the related molecular systems at specific reaction stages. The modeling results suggest that N2O5 is the better agent for nitration and bromine is suitable for use in halogenation. The comparable activation energies throughout the reaction stages were considered to imply the most feasible pathways of FOX‐7 synthesis. © 2009 Wiley Periodicals, Inc. Int J Quantum Chem, 2010 相似文献