Fa. Neugebauer et al., RADICAL CATIONS OF 1,2-BIS(DIALKYLAMINO)BENZENES - RESTRICTED ROTATION ABOUT THE C-NME(2) BOND, Tetrahedron letters, 35(27), 1994, pp. 4755-4758
The 1,2-bis(dialkylamino)benzene radical cations 2a-c(.+) were generat
ed by oxidation of the parent compounds with iodine or lead tetraaceta
te. ESR and ENDOR studies of 2a(.+) and 2b(.+) gave evidence of a rest
ricted rotation about the C-NMe(2) bond; based on the results of 2c(.) the different N-methyl proton splittings in 2a(.+) and 2b(.+) were a
ssigned to the exo and endo N-methyl groups.