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

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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.