Woonphil Baik, Cheol Hun Yoon, Ki Chang Lee, Hyun Joo Lee, Sangho Koo, Jihan Kim, Byunghoon Yoon and Hakwon Kim
In the presence of ZnCl2, 1,4-conjugated addition of anthrone with α,β-unsaturated ketones proceeded to give mono-Michael adducts, whereas in basic solution it gave bis-Michael adducts.