Determination of the relative signs of the 14N1H spin coupling constants in ethyl isonitrile by nuclear magnetic resonance double irradiation

Abstract

A ¹H–{¹H} decoupling experiment by the method of tickling is used to demonstrate that the signs of the spin couplings J¹⁴N–¹H _(CH2) and J¹⁴N–¹H _(CH3) in ethyl isonitrile are opposite. A similar experiment suggests that there is a small spin coupling J¹⁴N–¹H _(CH2) present in the tetraethylammonium cation.