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环戊烷结构广泛存在于天然产物及药物分子中,是小分子药物合成中重要的核心骨架之一.本文以N-环丙基苯胺和2-[乙酰氧基(苯基)甲基]丙烯酸甲酯为原料,以良好至优异的产率及非对映选择性得到了19种不同结构的环戊烷衍生物.值得一提的是,其中一个异构体可通过柱色谱法进行分离.该方案具有条件温和、底物范围广及绿色经济等特点,为环戊烷的合成提供了新方法,也为曙红Y在光催化合成领域的应用提供了新途径. 相似文献
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We present how to control the dynamics of optical solitons in optical fibers under nonlinearity and dispersion management, together with the fiber loss or gain. We obtain a family of exact solutions for the nonlinear Schrödinger equation, which describes the propagation of optical pulses in optical fibers, and investigate the dynamical features of solitons by analyzing the exact analytical solutions in different physical situations. The results show that under the appropriate condition, not only the group velocity dispersion and the nonlinearity, but also the loss/gain can be used to manipulate the light pulse. 相似文献
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We have shown that the application of modulating the secondary lattice is an efficient route to suppressing the generation of chaotic traveling waves of a Bose-Einstein Condensate with attractive interatomic interaction loaded into a moving optical superlattiee consisting of two lattices. With the Melnikov method, we obtain the optimal value of the relative phase between the two lattice harmonics for the control of chaos. We also find that the regularization route as the potential depth of the secondary lattice is varied and fairly rich, including the period-doubling bifurcations. 相似文献
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针对汽车安全避障的问题,考虑到环境因素的必要性,本文提出了一种基于路面附着系数估计的汽车纵向避障控制策略.首先,分析了路面附着系数对纵向避障控制策略的影响;给出了基于最小二乘法的路面附着系数估计算法,建立了考虑路面状态的安全距离模型;分析了行驶安全性和成员舒适性对避障控制策略的影响;在此基础上,建立了基于MPC的汽车纵... 相似文献
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使用廉价易得的邻烯基甲酰苯胺在可见光的诱导下发生自由基环化反应, 以良好至优秀的产率合成了15种2-喹啉酮衍生物. 该方法简单高效、 条件温和、 产率较高, 具有优异的官能团兼容性, 不仅拓展了邻烯基甲酰苯胺参与的新型有机反应, 也为光催化合成喹啉酮类化合物提供了一条新途径. 相似文献
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By using a unified theory of the formation of various types of vector-solitons in two-component Bose-Einstein condensates with tunable interactions,we obtain a family of exact vector-soliton solutions for the coupled nonlinear Schro¨dinger equations.Moreover,the Bogoliubov equation shows that there exists stable dark soliton in specific situations.Our results open up new ways in considerable experimental interest for the quantum control of multi-component Bose-Einstein condensates. 相似文献
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