排序方式: 共有3条查询结果,搜索用时 21 毫秒
1
1.
Synthesis of Diels—Alder adducts of phencyclone with diverse dienophiles provides the basis for a major extended module in the second-semester laboratory of an organic chemistry course. With many accessible target compounds, students can have individual novel compounds to prepare. Especially attractive for students, the adducts are highly hindered, resulting in slow rotation about the C—C sp2—sp3 single bond to the unsubstituted bridgehead phenyl groups. Slow-exchange-limit NMR spectra (1H at 300 MHz and 13C at 75 MHz) are obtained at ambient temperatures for these phenyl groups. The highly crystalline products are easily prepared and offer excellent opportunities to integrate modern 1-D and 2-D NMR techniques into this synthesis experiment, while introduccing concepts of dynamic NMR spectroscopy. The synthetic reactions are readily carried out at the microscale level. 相似文献
2.
C. MULLON J‐F. MITTAINE O. THÉBAUD G. PÉRON G. MERINO M. BARANGE 《Natural Resource Modeling》2009,22(4):564-609
Abstract To explore the drivers of change in the complex system relating small pelagic fisheries and fishmeal/fish oil markets, to identify the interactions between these drivers and their overall impacts, we propose a bio‐economic model, coupling the ecological and the economic dynamics of these global commodities. The model enables an analysis of the consequences of both global and local changes in the environment of production systems. Through sensitivity analysis of specific input parameters, we evaluate the robustness of the overall system to such changes and show that local responses of production systems and markets cannot be considered in isolation from the set of interactions at global level. 相似文献
3.
1