Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 125, Issue 8, Pages 2224-2227Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja029331x
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Reversible phototuning of the catalytic efficiency of the bis-barium complex of azobis(benzo-18-crown-6) in the basic ethanolysis of anilide derivatives has been achieved by light-induced cis reversible arrow trans interconversion of the azobenzene spacer unit of the catalyst. The geometry of the productive catalyst-substrate complex is more favorable when the concave cis form of the catalyst is involved. Continuous photoregulation of the catalytic activity at any intermediate value between the HIGH and LOW levels was achieved by proper adjustment of the excitation wavelength or the irradiation time. The complete and relatively fast interconvertibility of photostationary states allowed the activity of the catalyst to be repeatedly photoswitched HIGH and LOW in the course of the same run.
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