E-2-benzylidenebenzocyclanones. II. IR and mass spectrometric investigations

A series of E-2-benzylideneindanones (a) -tetralones (b) and -benzosuberone s (c) with OCH3 (2-4), NO2 (5-7) and F (8-10) substituents in ortho, meta o r para position was studied by IR and mass spectrometry. The most important IR bands were assigned and stated correlations between some frequencies an d the stereostructure or conjugation feature of the molecules investigated. IR spectra were also analyzed in order to find frequencies characteristic of the size of the alkanone ring. The mass spectrometric investigation aime d at determining fragmentation pathways and finding correlations between th em and the ring size of the alkanone ring or the position of the substituen ts. (C) 2000 Elsevier Science B.V. All rights reserved.