Raman and Infrared Spectra of 3-Methyleneoxetane

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Abstract
The infrared spectrum of 3‐methyleneoxetane in both the gaseous and liquid states has been recorded from 4000 to 250 cm−1 and the far‐infrared spectrum of the vapor has been recorded down to 70 cm−1. The Raman spectrum of the liquid has been recorded and depolarization values measured. The limited number of polarized Raman lines suggests the molecule is planar and has point‐group symmetry C2v. The assignment of the 27 fundamental vibrations, based on band positions, band contours, and depolarization values, is made. The interesting ring‐puckering vibration is assigned to a strong band in the infrared spectrum of the vapor which has a Q branch at 122 cm−1 with additional Q branches at 117 and 113.5 cm−1. These latter bands are assigned as the upper‐state transitions of the ring‐puckering vibration and indicate that the potential function governing the vibration is only slightly anharmonic.