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This paper make the explained variables our financial stress index consist of the synchronous variables financial systemic risk, and make the explanatory variables the macroeconomic variable, currency credit variable, asset price variable and the macroeconomic variable of correlative economic powers, then use stepwise regression method to establish the… (More)
The unprecedented N-heterocyclic carbene (NHC)-catalyzed intermolecular cross-coupling of enamides and aldehydes is described. Upon exposure of enamides to aldehydes in the presence of a NHC catalyst, catalytic C-C bond formation occurs, providing highly enantioselective N-protected amines, bearing a quaternary carbon center, in good yields and with high… (More)
Heats of formation of energetic materials can be obtained either experimentally or theoretically. In order to compare the results of the two methods, some correlation methods were proposed in this study. The molecular structures and heats of formation of nitrobenzenes, nitrotoluenes, nitroanilines, and nitrophenols were calculated by Dewar's AMI and… (More)
Reported herein is a ruthenium-catalyzed formal dehydrative [4 + 2] cycloaddition of enamides and alkynes, representing a mild and economic protocol for the construction of highly substituted pyridines. Notably, the features of broad substrate scope, high efficiency, good functional group tolerance, and excellent regioselectivities were observed for this… (More)
The isotopic effects on stereodynamic properties for the title reactions occurring on the two lowest-lying electronic potential energy surfaces (PESs) of LiH(2)(+) are investigated in detail by means of the quasi-classical trajectory (QCT) method at a collision energy of 0.5 eV, using the ab initio potential energy surfaces (PESs) of Martinazzo et al. (J.… (More)
An unprecedented N-heterocyclic carbene catalyzed chemoselective and enantioselective cascade reaction of enals with nitroalkenes has been developed. A wide range of enantioenriched dihydrocoumarins has been prepared, and the reaction goes through an enolate intermediate generated under a catalytic process.