Low‐frequency vibrational spectra and conformations of bicyclo [3.2.0] hept‐6‐ene and 2‐oxabicyclo [3.2.0] hept‐6‐ene
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The low-frequency (100-500 cm-1) infrared and Raman spectra of bicyclo [3.2.0] hept-6-ene and its 2-oxa analog have been analyzed. The large collection of transitions involving the four out-of-plane ring modes were assigned and complex interaction was found. For the oxa compound a detailed energy level diagram was determined from the 30 transitions observed. Analysis of the ring-puckering spectra demonstrated that the asymmetric potential energy functions had only one energy minimum within 4 kcal/mole of the ground state, which corresponds to a boat species. Whether a second minimum is present at higher energies could not be determined. © 1978 American Institute of Physics.
author list (cited authors)
Villarreal, J. R., & Laane, J.