A. Baramee, Jon Clardy, P. Kongsaeree, S. Rajviroongit, C. Suteerachanon, C. Thebtaranonth, Y. Thebtaranonth Anions of chalcone-epoxides. Chemical Communications. No.13 (1996), 1511-1512. doi:10.1039/cc9960001511 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/17578
Treatment of chalcone-epoxide 1 with lithium tetramethyl-piperidide gives two anions: enolate 3 and the remote anion 4 which upon formation, 4 adds to unreacted starting material 1 to yield the diastereoisomeric products 5 and 6.