Complete assignment of the C-13 NMR spectra of 4,4-dimethylanthracene-1,9,10(4H)-trione and the regioisomeric monomethyl derivatives

Abstract

The H-1 and C-13 NMR spectra of a set of structurally related tricyclic quinones consisting of 4,4-dimethylanthracene-1,9,10(4H)-trione (1), 4,4,6,7-tetramethylanthracene-1,9,10(4H)-trione (2) and the regioisomers 4,4,5- (3), 4,4,6- (4), 4,4,7- (5) and 4,4,8-trimethylanthracene-1,9,10(4H)-trione (6) were assigned completely using two-dimensional techniques.