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- [7] Highly endo- and enantioselective asymmetric nitrone cycloadditions catalyzed by the aqua complex of 4,6-dibenzofurandiyl-2,2′-bis (4-phenyl-oxazoline)-nickel(II) perchlorate.: Transition structure based on dramatic effect of MS 4A on selectivities [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1998, 120 (47) : 12355 - 12356