Nansheng Li

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[reaction: see text] An efficient method has been developed to prepare all four isomers of the hydroxyl derivatives of sibutramine by addition of Grignard reagents (R)- or (S)-5 to a single enantiomer of sulfinyl imine (R)-1 simply by tuning the reaction solvent. The phenomenon of the reversed diastereoselectivity in CH(2)Cl(2) and THF implied that the(More)
According to the particularity of cold-region for its geographical and climatic environments where the oil-pipeline is laid, the author adopts suitably physical parameters and mathematical-physical models involved in the oil-pipeline system, to simulate the boundary conditions of ground surfaces and the region where oil-pipeline is located, constructing(More)
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