Intramolecular [2+2] photocycloaddition of aromatic chain imides possessing bis-phenanthrene moieties afforded straight and cross ring closure products. The ratio of cycloadducts was dependent on reaction time and temperature, which resulted in a reversal of regioselectivity. The reaction was proved to involve a retro cycloaddition. The cross ring closure products were formed predominantly in the early
13. Symmetrical triad prototropic systems. Part IX. The influence of polynuclear aryl groups upon mobility and equilibrium in the αγ-diarylmethyleneazomethine system
作者:Charles W. Shoppee
DOI:10.1039/jr9330000037
日期:——
Nurses' representations of the perceived causes of work-related stress: A network drawing approach
作者:Steven Muncer、Shirley Taylor、D. W. Green、I. C. Mcmanus