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The development of general catalytic methods for the regio- and stereoselective construction of chiral N-heterocycles in a diversity-oriented fashion remains a formidable challenge in organic synthesis. N-heterocyclic carbene (NHC) catalysis has been shown to produce a variety of outcomes, but control of the reactivity has rarely been demonstrated. Here we(More)
As a whole, this membrane integration desalination technology without acid and alkali is benefit to the environment. As a new technology, membranes are used into separate and concentrate the pollutants in oily wastewater through its permselectivity. In this paper, organic film, inorganic film and biofilm are described in the progress of oily wastewater,(More)
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