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排序方式: 共有59条查询结果,搜索用时 546 毫秒
1.
A. Parlier H. Rudler N. Platzer M. Fontanille A. Soum 《Journal of organometallic chemistry》1985,287(1):c8-c12
Treatment of VO(acac)2 with the facial-tridentate organometallic ligand [η-CpCo{P(O)(OEt)2}3]? affords a new binuclear compound [η-CpCo{P(O)(OEt)2}3VO(acac)] (I). This compound undergoes protonation with HPF6 in the presence of 1,10-phenanthroline (phen), or 2,2′-bipyridyl (bipy), to yield binuclear cationic derivatives [η-CpCo{P(O)(OEt)2}3VO(phen))]+PF6? (II), and [η-CpCo{P(O)(OEth)2}3VO(bipy)]+PF6? (III). The X-ray crystal structure determination and full characterization of I has been performed. The catalytic oxygenation and oxygen transfer to 3,5-di-t-butylcatechol in the presence of I, II+, or III+ complexes is reported. 相似文献
2.
3.
Zusammenfassung In dieser Arbeit wurden Schlußfolgerungen über den simultanen Verlauf der beiden Reduktionsphasen von Resazurin überprüft.Weiters wurden Bedingungen für die quantitative titanometrische Bestimmung von Resazurin und seiner Derivate ermittelt.
Mit 4 Abbildungen 相似文献
The conclusions about the simultaneous course of reduction of Resazurin to Resorufin and Resorufin to Dihidroresorufin were verified in this work.The conditions for the quantitative titanometric determination of Resazurin and its derivatives were found.
Mit 4 Abbildungen 相似文献
4.
2-Phenylpyridine activated by chromium tricarbonyl reacts with bis(TMS) ketene acetals to give pyridine-substituted bicyclic γ-lactones. On the other hand, its reaction with the same acetals leads, upon activation with methylchloroformate, to dihydropyridines which can be oxidized to highly substituted, lactone-containing piperidines. 相似文献
5.
We report here our findings on a new and highly efficient strategy for the synthesis of β-amino acids involving the addition of bis(O-silyl) ketene acetals on Mannich type iminium electrophiles. 相似文献
6.
Florent Balacheff Hugo Parlier Stéphane Sabourau 《Geometric And Functional Analysis》2012,22(1):37-73
Given a Riemannian surface, we consider a naturally embedded graph which captures part of the topology and geometry of the
surface. By studying this graph, we obtain results in three different directions. 相似文献
7.
Hugo Parlier 《Israel Journal of Mathematics》2008,166(1):297-311
In this paper, involutions without fixed points on hyperbolic closed Riemann surface are discussed. For an orientable surface
X of even genus with an arbitrary Riemannian metric d admitting an involution τ, it is known that min
p∈X
d(p, τ(p)) is bounded by a constant which depends on the area of X. The corresponding claim is proved to be false in odd genus, and the optimal constant for hyperbolic Riemann surfaces is
calculated in genus 2.
The author was supported in part by the Swiss National Science Foundation grants 20-68181.02 and PBEL2-106180. 相似文献
8.
Adriaan M. H. van der Veen Thomas P. J. Linsinger Andree Lamberty Jean Pauwels 《Accreditation and quality assurance》2001,6(6):257-263
To serve as a measurement standard, a (certified) reference material must be stable. For this purpose, the material should
undergo stability testing after it has been prepared. This paper looks at the statistical aspects of stability testing. Essentially,
these studies can be described with analysis of variance statistics, including variant regression analysis. The latter is
used in practice for both trend analysis and for the development of expressions for extrapolations. Extrapolation of stability
data is briefly touched upon, as far as the combined standard uncertainty of the reference material is concerned. There are
different options to validate the extrapolations made from initial stability studies, and some of them might influence the
uncertainty of the reference material and/or the shelf-life. The latter is the more commonly observed consequence of what
is called ’stability monitoring’.
Received: 6 October 2000 Accepted: 4 December 2000 相似文献
9.
For compact Riemann surfaces, the collar theorem and Bers’ partition theorem are major tools for working with simple closed
geodesics. The main goal of this article is to prove similar theorems for hyperbolic cone-surfaces. Hyperbolic two-dimensional
orbifolds are a particular case of such surfaces. We consider all cone angles to be strictly less than π to be able to consider
partitions.
Emily B. Dryden—partially supported by the US National Science Foundation grant DMS-0306752.
Hugo Parlier—supported by the Swiss National Science Foundation grants 21-57251.99 and 20-68181.02. 相似文献
10.
The polycondensation of p-aminobenzoic acid by the use of triphenylphospine and hexachloroethane is described. One way to obtain a mixed solution of rigid rod and flexible coil polymers is the polycondensation of the rigid chains in a solution of a flexible polymer matrix. Results on matrix polycondensation of poly(p-benzamide) in solutions of poly(methyl methacrylate), poly(methyl methacrylate-co-styrene), polystyrene and polyacrylonitrile are reported. It is shown that there exists an interrelation between the phase behavior of the mixed polymer solutions and the influence of the matrix polymer on the synthesis of poly(1.4.-benzamide). The ternary phase diagrams of the rigid rod/flexible coil polymer solutions were determined. 相似文献