Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A chiral nickel complexes-catalyzed enantioselective Michael addition of 1,3-dicarbonyl compounds to 3-nitro-2H-chromenes has been developed; the products could be obtained in high yields and good enantioselectivities. ... A chiral nickel complexes-catalyzed enantioselective ...