Selective <i>N</i>-monomethylation of primary anilines with the controllable installation of <i>N</i>-CH<sub>2</sub>D, <i>N</i>-CHD<sub>2</sub>, and <i>N</i>-CD<sub>3</sub> units
The selective N-monomethylation of primary anilines with the controllable installation of N-CH2D, N-CHD2, and N-CD3 units was realized by using the amine-borane/N,N-dimethylformamide (DMF) system as the methyl precursor.
How an Eight-Membered Ring Alters the Rhodamine Chromophore
作者:Yevgen M. Poronik、Filip Ambicki、Sheng-Ming Tseng、Pi-Tai Chou、Irena Deperasińska、Daniel T. Gryko
DOI:10.1021/acs.joc.0c00414
日期:2020.5.1
Readily available phenylene-1,3-diamines can be converted into unprecedented analogues of rhodamine and malachite green possessing a central eight-membered ring in three steps. The overall process couples a cyanine chromophore with a urea bridge giving rise to new dyes possessing distinct spectral characteristics: absorption of orange light combined with a weak emission of red light both in solution and in the crystalline state. Their photophysics is governed by the twist of lateral phenyl rings and intramolecular and intermolecular CT transitions.