Keto-enol tautomerization of 2-(2-hydroxyphenyl)benzoxazole and 2-(2-hydroxy-4-methylphenyl)benzoxazole in the triplet state: hydrogen tunneling and isotope effects. 2. Dual phosphorescence kinetics

1991 ◽  
Vol 95 (25) ◽  
pp. 10509-10518 ◽  
Author(s):  
Heike Eisenberger ◽  
Bernhard Nickel ◽  
A. Andreas Ruth ◽  
Wajih Al-Soufi ◽  
Karl H. Grellmann ◽  
...  
Keyword(s):  
Triplet State ◽  
Isotope Effects ◽  
Hydrogen Tunneling

Zum Mechanismus der photochemischen Dehydrocyclisierung von Diphenyläther / On the Mechanism of the Photochemical Dehydrocyclisation of Diphenylether

1977 ◽  
Vol 32 (3) ◽  
pp. 285-288 ◽  
Author(s):  
Klaus-Peter Zeller ◽  
Günther Gauglitz
Keyword(s):  
Triplet State ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Reaction Scheme ◽  
Reactive Species ◽  
Kinetic Isotope

The photochemical cyclisation of diphenylether to dibenzofuran is scavenged by trans-1,3-pentadiene indicating that the triplet state of the ether is the reactive species. The intramolecular, kinetic isotope effects kʜ/kᴅ for the cyclisation of 2-deuteriodiphenyl ether and 1-phenoxy-4-pentadeuteriophenoxy-benzene are 1.12 ± 0.05 and 1.19 ± 0.05, respectively. A reaction scheme consisting of a photochemical cyclisation to 1 a, 9 a-dihydrodi-benzofuran followed by dehydrogenation to dibenzofuran is suggested.

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