... Chemical shifts were measured with respect to the residual proton and to carbon signals of deuterated solvents [CDCl3, δН 7.26, δС 77.2 ppm; (CD3)2CO, δН 2.05, δС 30.2 ppm; (CD3)2SO, δН 2.50, δС 40.1 ppm]. ... RUSSIAN JOURNAL OF ORGANIC CHEMISTRY Vol. ...