Pentacyclic coumarin-based blue emitters – the case of bifunctional nucleophilic behavior of amidines

Yevgen M. Poronik, Daniel T. Gryko
2014 Chemical Communications  
Esters of coumarin-3-carboxylic acids undergo addition to DBU and DBN leading to the formation of a 6-membered ring.
doi:10.1039/c4cc01106f pmid:24652376 fatcat:tvmemzopcrgatb2jy77g2jrvga