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Studies on the PMR Spectra of Oxetanes

Abstract The oxetane parts of 2-(4-methylphenyl) oxetane, 2-(2,4-dimethylphenyl)oxetane and 2-(2,4,6-tri-methylphenyl) oxetane have been analysed as the ABCDE spin systems from the 60 MHz PMR spectra. The chemical shifts and the proton-proton couplings of the protons in the oxetane rings have been solved through iterative calculations. The possible phenomena which may affect the chemical shifts and couplings have been investigated. One of the most dominating factor seems to be the non-planarity of the oxetane ring. The ring current effects of the 2-substituents and the field effects of the methyl groups shift the resonances of the oxetane ring protons.