The Photochemistry of Heterocycles

Matrix Isolation in Heterocyclic Chemistry

“…The UV-induced photochemistry of heterocyclic compounds has been typically understood in terms of the chemistry of their π*←π or π*←n electronic excited states [40,41]. However, this paradigm was shifted in 2002, when Sobolewski et al showed that dark *←π states featuring a dissociative character along a hydroxyl (OH) or azine (NH) group must also be taken into account [42].…”

New Methyl Dehydroabietate Derivatives: Synthesis and Structural Characterization

“…This unstable compound was expected to be the pyrazoline 8 since it is well known that such type of compounds are frequently very unstable intermediates in the syntheses of pyrazoles [23,24], and this was con®rmed by NMR and MS analysis of a reaction carried out in CD 3 OD. Attempts were made to improve the yield of 9 through the addition of an oxidizing agent (aqueous KMnO 4 ) to the reaction media (using THF as solvent); however, no signi®cant changes in the yield of the pyrazole 9 were found.…”