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排序方式: 共有97条查询结果,搜索用时 15 毫秒
31.
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Giampiero Pagani Zecchini Mario Paglialunga Paradisi 《Journal of heterocyclic chemistry》1979,16(8):1589-1597
Treatment of protected dipeptides containing 1,2,3,4-tetrahydroquinoline-2-carboxylic acid with acetic anhydride affords only 1H,3H,5H-oxazolo[3,4-a]quinolin-3-one derivatives. The formation of a-acylaminomethylketones, arising from the competitive Dakin-West reaction, was generally observed when the cyclization procedure was extended to some amides of the cyclic imino acid. The preferential stabilization of one of two probable mesoionic intermediates seems to determine the preferred pathway. 相似文献
33.
Mario Paglialunga Paradisi Giampiero Pagani Zecchini Giorgio Ortar 《Tetrahedron letters》1980,21(52):5085-5088
The title process has been accomplished by a three-step sequence involving protection of aldehyde as the imine, reduction of ketone with lithium tri--butoxyaluminohydride, and regeneration of aldehyde on hydrolytic work-up. 相似文献
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. We consider the problem of finding a holomorphic function in a strip with a cut ${\cal A}= \{(x,y) : \, x\in\RE,\,\,0 satisfying some prescribed linear conditions on the boundary. The problem has a one‐parameter family of solutions in the class of sectionally holomorphic functions in ?, vanishing for $|x|\to\infty. We consider the problem of finding a holomorphic function in a strip with a cut satisfying some prescribed linear conditions on the boundary. The problem has a one‐parameter family of solutions in the
class of sectionally holomorphic functions in ?, vanishing for . A special solution can be selected by fixing the value of the circulation around the cut. The problem is obtained by linearization
of the equations of the wave‐resistance problem for a “slender” cylinder submerged in a heavy fluid and moving at uniform
speed in the direction orthogonal to its generators. The results obtained, besides their own interest, are a crucial step
for the resolution of the non‐linear problem.
(Accepted October 14, 1998) 相似文献
37.
Ortho-para H₂ conversion by proton exchange at low temperature: an accurate quantum mechanical study
We report extensive, accurate fully quantum, time-independent calculations of cross sections at low collision energies, and rate coefficients at low temperatures for the H? + H?(v = 0, j) → H? + H?(v = 0, j') reaction. Different transitions are considered, especially the ortho-para conversion (j = 1 → j' = 0) which is of key importance in astrophysics. This conversion process appears to be very efficient and dominant at low temperature, with a rate coefficient of 4.15 × 10?1? cm3 molecule?1 s?1 at 10 K. The quantum mechanical results are also compared with statistical quantum predictions and the reaction is found to be statistical in the low temperature regime (T < 100 K). 相似文献
38.
W. Hollik J. M. Lindert D. Pagani 《The European Physical Journal C - Particles and Fields》2013,73(5):1-13
In this paper we present an analysis at NLO QCD of the contribution from squark-squark production to the experimental signature $2j+l^{+}l^{-}+ \displaystyle{\not}E_T (+X)$ with opposite-sign same flavor leptons, taking into account decays and experimental cuts. We consider the case in which one squark decays directly into the lightest neutralino $\tilde{\chi}^{0} _{1}$ and the other one into the second lightest neutralino and subsequently into $l^{+}l^{-} \tilde{\chi}^{0} _{1}$ via an intermediate slepton. On the one hand we study the effects of the NLO corrections on invariant mass distributions which can be used for future parameter determination. On the other hand we analyze the impact on predictions for cut-and-count searches using the given experimental signature. 相似文献
39.
In this work we study the additive orbifold cohomology of the moduli stack of smooth genus g curves. We show that this problem reduces to investigating the rational cohomology of moduli spaces of cyclic covers of curves where the genus of the covering curve is g. Then we work out the case of genus g = 3. Furthermore, we determine the part of the orbifold cohomology of the Deligne–Mumford compactification of the moduli space of genus 3 curves that comes from the Zariski closure of the inertia stack of ${\mathcal{M}3}$ . 相似文献
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