Raman Spectra of Gases. III. 2,5-Dihydropyrrole, Trimethyleneimine, and 1-d-Trimethyleneimine

Abstract
The Raman spectra of 2,5‐dihydropyrrole, trimethyleneimine, and 1‐d‐trimethyleneimine in the gas phase have been recorded. Both Δv=1 and Δv=2 transitions have been observed for the ring‐puckering mode. The Δv=1 transitions were quite weak for trimethyleneimine which seems to be consistent with the asymmetry of the ring‐puckering wavefunctions.