The synthesis of the unknown 2,2‐diphenylindoxyl (Ia) following the path VI → VII → VIII → Ia it herein described. The chemical evidence, and the infrared and ultraviolet spectra are in consonance with the structural formula. The unresolved signal at 5.24 p.p.m., appearing in the NMR spectrum of Ia is assigned to the N ‐ H proton.
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Sarel et al. (1964) studied this question.
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