LOW-FREQUENCY VIBRATIONAL-SPECTRA AND CONFORMATIONS OF BICYCLO [3.2.0] HEPT-6-ENE AND 2-OXABICYCLO [3.2.0] HEPT-6-ENE

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.

LOW-FREQUENCY VIBRATIONAL-SPECTRA AND CONFORMATIONS OF BICYCLO [3.2.0] HEPT-6-ENE AND 2-OXABICYCLO [3.2.0] HEPT-6-ENE Academic Article