Some Considerations Regarding the NMR Spectra of 1-phenylselanylazulene Derivatives

The nuclear magnetic resonance is one of the most widely used procedures for the compounds identification and characterization. While the 1H and 13C spectra are commonly used for almost all organic materials, those resulted from other paramagnetic elements, as 77Se can be also used for determining the compounds structure. During our study on the azulene compounds containing in the molecule chalcogen atoms [1] we have paid special attention to the selenium compounds [2,3] due to their peculiar structure and properties as well as for their potential medical purposes [4]. The target of this paper is to analyse the NMR spectra of 1-phenylselanylazulene, compound 1H and of several of its derivatives. The spectra of the compounds which, in addition to phenylselenium group, either possess in position 3 other substituentscompounds 1X, or are substituted with alkyl groups, 1Rn are also commented. In addition, we considered interesting to discuss the spectra of the compounds in which the selenium atom(s) is oxidized, as in compounds 2-4 from scheme 1.