Identification and characterization of 1,2-BN cyclohexene using microwave spectroscopy

1,2-BN cyclohexene has been produced from 1,2-BN cyclohexane through the loss of H₂ and characterized and identified using a pulsed-beam Fourier-transform microwave spectrometer. Microwave spectra were measured in the frequency range of 5.5-12.5 GHz, providing accurate rotational constants and quadrupole coupling strengths. Results of high level calculations allowed clear assignment of the spectra to 1,2-BN cyclohexene. Heating the initial compound, 1,2-BN cyclohexane, to 60 °C in a 1 atm neon stream results in the loss of H₂ and conversion to 1,2-BN cyclohexene and this appears to be the first characterization of this compound as the 1,2-BN cyclohexene monomer.