Conformational analyses of quinolines substituted with a vinyloxy or vinylthio group at the ortho position by means of the NMR selective relaxation method. Experimental verification of the planar conformation in solution
Abstract
Conformations of
The conformations defined by the rotations about C(2)–X(O or S) and X(O or S)–C(1′) have been analyzed using the equilibrium model, in which the values of σij obtained experimentally have been compared with the total average of σij, σijtotal, and the fractional populations of the pertinent conformers have been determined. The predominance in solution of conformer 1 (see