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Three pyridyl functionalized bis(pyrazol‐1‐yl)methanes, namely 2‐[(4‐pyridyl)methoxyphenyl] bis(pyrazol‐1‐yl)methane (L1), 2‐[(4‐pyridyl)methoxyphenyl]bis(3,5‐dimethylpyrazol‐1‐yl)methane (L2) and 2‐[(3‐pyridyl)methoxyphenyl]bis(pyrazol‐1‐yl)methane (L3) have been synthesized by the reactions of (2‐hydroxyphenyl)bis(pyrazol‐1‐yl)methanes with chloromethylpyridine. Treatment of these three ligands with R2SnCl2 (R = Et, n‐Bu or Ph) yields a series of symmetric 2:1 adducts of (L)2SnR2Cl2 (L = L1, L2 or L3), which have been confirmed by elemental analysis and NMR spectroscopy. The crystal structures of (L2)2Sn(n‐Bu)2Cl2·0.5C6H14 and (L3)2SnEt2Cl2 determined by X‐ray crystallography show that the functionalized bis(pyrazol‐1‐yl)methane acts as a monodentate ligand through the pyridyl nitrogen atom, and the pyrazolyl nitrogen atoms do not coordinate to the tin atom. The cytotoxic activity of these complexes for Hela cells in vitro was tested. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
994.
1 引 言
对于一阶常微分方程
y'=f(t,y).(1)
的数值解法,目前常用的主要有两类方法:单步法和线性多步法(Linear Multistep Methods,LMM). 相似文献
995.
Lintao Wu Baoan Song Pinaki S. Bhadury Song Yang Deyu Hu Linhong Jin 《Journal of heterocyclic chemistry》2011,48(2):389-396
A series of novel pyrazole amides J1 , J2 , J3 , J4 , J5 , J6 , J7 , J8 , J9 , J10 , J11 , J12 , J13 , J14 , J15 containing an α‐aminophosphonate moiety were synthesized and subsequently characterized by spectral (IR, 1H‐, 13C‐, 31P‐, and 19F‐NMR) data and elemental analysis. The racemic sample of J1 was further separated into its enantiomers under normal‐phase condition on two immobilized polysaccharide‐based chiral stationary phases (Chiralpak IA and Chiralpak IC). The synthesized compounds revealed certain degree of antiviral activity in the bioassay. The title compounds ( J3 , J10 , and J12 ) showed some curative activities (39.9%, 41.8%, 50.1%, respectively) against tobacco mosaic virus at 0.5 mg/mL. J. Heterocyclic Chem., 00 , 00 (2011). 相似文献
996.
JPC – Journal of Planar Chromatography – Modern TLC - Two new types of reversed-phase sintered plate have been prepared used in planar electrochromatography (PEC). One was bonded with... 相似文献
997.
A theoretical investigation of the H2O + HCNO reaction, which is carried out by means of CCSD(T)/6‐311G(d,p)//B3LYP/6‐311G(d,p)+ZPVE computational method to determine a set of reasonable pathways, there are seven product pathways, P i with i = 1 , 2 , …, 7 are involved. It is shown that P 1 (H2O + NCOH), P 2 (CO + NH2 + OH), P 4 (HCN + HO2 + H), and P 6 (CO + NH2OH) are the major product channels; and P 7 (HOC + H2 + NO) is the minor product channels, whereas the other channels for P 3 (HNO + HCOH) and P 5 (HNO + H2CO) are very minor, the minor product channels. © 2010 Wiley Periodicals, Inc. Int J Quantum Chem, 2011 相似文献
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Hongdian Lu Charles A. Wilkie Ming DingLei Song 《Polymer Degradation and Stability》2011,96(5):885-891
Nanocomposites of poly (vinyl alcohol) with ethylamine modified zirconium phosphate (ZrP-EA) were prepared by solution blending. Their morphologies were elucidated with X-ray diffraction and transmission electron microscopy, while the thermal stability and flammability performance were characterized by thermogravimetric analysis, Fourier transform infrared spectra and microscale combustion calorimetry. It was established that the morphology of the nanocomposites evolved as ZrP-EA content increased. In the nanocomposites, catalytic degradation of the acetate groups remaining in poly (vinyl alcohol) occurred and catalytic carbonization was observed. Microscale combustion calorimetry revealed that the flammability performance of poly (vinyl alcohol) was improved by the introduction of zirconium phosphate nanoplatelets. 相似文献