The stabilities of Meisenheimer complexes. Part X. Association of 1,1-dimethoxy-complexes with cations
Abstract
Equilibrium and kinetic measurements are reported for the formation in methanol of 1,1-dimethoxy-Meisenheimer complexes from activated aromatic anisoles and sodium methoxide in the presence of 18-crown-6-ether. Comparison of the results with those obtained without crown ether leads to the suggestion that sodium ions associate with the Meisenheimer anions through interaction with the oxygen atoms of the methoxy-groups at C(1) and the ortho-substituents.