An NMR Study of Indene Using a Proton-Proton Decoupling Technique

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Abstract
The 60 Mc/sec high‐resolution NMR spectrum of the protons of the five‐membered ring of indene [Complex chemical formula] has been studied with the aid of the audio sideband phase detection proton—proton spin decoupling technique. The chemical shifts and the spin—spin coupling constants have been measured. The relative sign of the spin coupling constant JAX was determined to be different than that of JAK and JKX by double irradiation experiments. Certain long‐range couplings of the aromatic protons with the five‐membered ring protons were detected.