作者:Marcin Jasiński、Jason S. Gerding、Aleksandra Jankowiak、Krzysztof Gębicki、Jarosław Romański、Katarzyna Jastrzębska、Ajan Sivaramamoorthy、Kristein Mason、Donavan H. Evans、Małgorzata Celeda、Piotr Kaszyński
DOI:10.1021/jo400843y
日期:2013.8.2
Transformations of functional groups, such as OCH2Ph, OCOPh, NO2 and I, in 1,3,5-triphenyl-6-oxoverdazyls la le were investigated in order to expand the range of synthetic tools for incorporation of the verdazyl system into more complex molecular architectures and to increase spin delocalization. Thus, Pd-catalyzed debenzylation of the OCH2Ph group or basic hydrolysis of the OCOPh group gave the phenol functionality, which was acylated, but could not be alkylated. Orthogonal deprotection of diphenol functionality was also demonstrated in radical 1c. Pt-catalyzed reduction of the NO2 group led to the aniline derivative, which was acylated. Attempted C-C coupling reactions to iodophenyl derivatives le and Se were unsuccessful. Selected verdazyl radicals were characterized by EPR and electronic absorption spectroscopy, and results were analyzed with the aid of DFT computational methods.