350 MHz 1H NMR spectra,dipole moments and preferred conformation of 8,9-epoxy-6,7-dihydro-5H-benzocyclohepten-5-ones

350 MHz ¹H NMR spectra and dipole moments showed that in the preferred conformation of 8,9-epoxy-6,7-dihydro-5H-benzocyclohepten-5-one and its 1,4-dimethoxy derivative the oxirane ring takes a pseudo-axial position.