THE INTERACTION VECTOR MODEL AND THE SECONDARY TRANSITION OF DIPHENYLETHER, AND OF SOME OF ITS NATURAL DERIVATIVES - ENNEAPHYLLINE, PILOCEREINE, CHONDROCURINE, DAPHNANDRINE, DAPHNOLINE, TILIACORINE

Using the interaction vector model(1,2) (IVM), it is possible to calcu late the intensity of the secondary transition of the benzene chromoph ore (towards 255 nm for the benzene molecule itself), on a very simple basis. This transition is electronically forbidden because of the D-6 h symmetry of the benzene molecule. Many spectra have been studied wit h the IVM, specially those of natural products since they are the main concern of the laboratory. Alkyl, amino, hydroxy, alkoxy substituents , fused rings effects have been taken into account. The present work w ill be devoted to the study of diphenyletber (phi-O-phi) derivatives w hich display an interesting challenge to the IVM since the two phenyl rings are ''conjugated'' through the oxygen non bonding electrons.