The interaction of hydrogen chloride with ethers and other bases studied by 35Cl nuclear quadrupole resonance and 1H nuclear magnetic resonance

Abstract

The 35Cl NQR and 1H NMR spectra of a series of adducts of hydrogen chloride have been measured at a variety of temperatures. The strength of the interaction of the hydrogen chloride with the base varies with the strength of the base and the variation of the 35Cl NQR frequency provides a direct measure of this. The change is much larger than that found for the 35Cl NQR signals in boron trichloride adducts of bases. The 1H NMR signals follow the same trend and there is a good correlation between the two sets of measurements. The interaction of HCl with aromatic ethers occurs at the oxygen and not on the ring. Adducts of type B.2HCl have the second hydrogen chloride molecule interacting with the chlorine of the first.