Cover Feature: Regioselective Acylation of 2,3,4,6‐Tetrahydro‐1,6‐dithia[3‐ a ]azaphenalene toward Donor–Acceptor‐Type Benzophenones (Asian J. Org. Chem. 3/2018)

2,3,4,6‐Tetrahydro‐1,6‐dithia[3‐ a ]azaphenalene (THDTAP) is a heteropolycycle possessing two active sites for acylation. The regioselective acylation of THDTAP was conducted at the para and meta positions with respect to the nitrogen atom, resulting in a series of para ‐ and meta ‐substituted benzophenones having a donor–acceptor‐type structure. The benzophenone derivatives are distinct in chemical reactivity and photophysical properties. para ‐Substituted benzophenones show reversible OFF/ON fluorescence upon acidification and neutralization. More information can be found in the Full Paper by Xiangfeng Shao et al. on page 579 in Issue 3, 2018 (DOI: 10.1002/ajoc.201700624).