Dependence of 1H NMR chemical shift of the backbone protons of the IMes ligand in (IMes)Pd(TFA)2(L) (L= H2O, 4, N-ethyltosylamide, or cyclohexene) on ligand concentration in the absence of added base Na2CO3. The curve fit results from a nonlinear least-squares fit to a hyperbolic function of [ligand]. Conditions: [(IMes)Pd(TFA)2(H2O)] = 5 mM, [Ligand] = 0 – 0.08 M, in toluene-d8, 24 °C.