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排序方式: 共有61条查询结果,搜索用时 15 毫秒
1.
Alvisi D Blart E Bonini BF Mazzanti G Ricci A Zani P 《The Journal of organic chemistry》1996,61(20):7139-7146
The palladium-catalyzed desilylation-arylation of substituted vinylsilanes by p-iodoanisole in the presence of bidentate phosphine ligands is described. Apart from enhancing the rate of the reaction considerably, heteroatom-based functional groups in the vinylsilane moiety have a profound influence on the regiochemistry. A catalytic cycle for the chelation-controlled desilylation-arylation reaction involving five- and six-membered chelate rings is proposed. 相似文献
2.
A Partial Statistically Incorporation of Ca2+ into the Ba6Nd2Al4O15-Type: Ba5CaLa2Fe4O15 Using high temperature reactions we succeeded in incorporating Ca2+ into the Ba6Nd2Al4O15 type. Single crystal X-ray methods reveal a partly ordered alkaline earth distribution. Ba2+ and Ca2+ occupy face connected MO6-octahedra as well as a further point position together with La3+ ions (space group C−P63mc; a = 11.770; c = 7.039 Å; Z = 2). 相似文献
3.
Juan Bisceglia María B. García Rosana Massa María L. Magri Mariana Zani Gabriel O. Gutkind Liliana R. Orelli 《Journal of heterocyclic chemistry》2004,41(1):85-90
A method is described for the synthesis of bis(3‐aryl‐1‐hexahydropyrimidinyl)methanes 1, by condensation of N‐aryl‐1,3‐propanediarnines 2 with formaldehyde. The reaction mechanism involves N‐arylhexahydropyrimidines 3 as intermediates. Such compounds can also be prepared efficiently by a methylene exchange reaction between bis‐hexahydropyrimidines 1 and the corresponding diamines 2. The antimicrobial activity of compounds 1 was evaluated by the disk diffusion method and some of them showed moderate to good growth inhibition activity. 相似文献
4.
Four C-2 unsubstituted naphtho[2,3-b]furan-4,9-quinones were prepared via the corresponding phthalides obtained by directed ortho-metalation-based route. 相似文献
5.
We show a large deviations principle for the family of random variables
when t+, where B=(B
u
,u0) is a standard linear Brownian motion. 相似文献
6.
Background
There is fMRI evidence that women are neurally predisposed to process infant laughter and crying. Other findings show that women might be more empathic and sensitive than men to emotional facial expressions. However, no gender difference in the brain responses to persons and unanimated scenes has hitherto been demonstrated. 相似文献7.
The main purpose of this paper is to show, in the two-dimensional torus, a necessary and sufficient condition in order to certain perturbations of zero order of a system of constant real vector fields to be globally s-solvable. We are also interested in studying its global s-hypoellipticity. We present connections between these global concepts and a priori estimates. We also present two applications of our results for systems of operators with variable coefficients. 相似文献
8.
The naturally-occuring furanonaphthoquinone 1e have been synthesized in good overall yield by a route involving directed ortho metalation (Scheme 1, 1 → 2). 相似文献
9.
We consider a first order linear partial differential operator of principal type on a closed connected orientable two-dimensional manifold sending sections of one complex line bundle to sections of another. We prove that the assumption of global hypoellipticity of the operator implies a relation between the degrees of the line bundles and the Euler characteristic of the manifold. 相似文献
10.
We prove a functional large deviations principle for the family of random functions
, where { Zt, t ∈, [0, 1]} is a real-valued centered Gaussian process. Bibliography: 19 titles.
Published in Zapiski Nauchnykh Seminarov POMI, Vol. 328, 2005, pp. 169–181. 相似文献