科研之友
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摘要
A series of new substituted benzo[1 3]oxazines presenting bulky substituents on the chiral oxazine centre were prepared from isopropyl ketones or substituted cyclohexanones Laser irradiation of these uncoloured compounds in solution promotes the cleavage of the C-O bond and the opening of the [1 3]oxazine ring generating a zwitterionic species incorporating a 3H-indolium cation and a 4-nitrophenolate anion that absorbs strongly at 440 nm The photogenerated coloured open isomers are thermally unstable and revert to the initial closed form with first order kinetics and lifetimes ranging fr
- 出版日期2010-11-15
