2697-21-4Relevant articles and documents
Decomposition and Isomerization of Bridgehead Cis 1,2-Diazenes (Azoalkanes)
Chae, Woo-Ki,Baughman, Sharon A.,Engel, Paul S.,Bruch, Manfred,Oezmeral, Cenan,et al.
, p. 4824 - 4833 (1981)
Four acyclic cis 1,2-diazenes, azo-1-adamantane (cis-ada), azo-bicyclooctane (cis-), azo-1-bicycloheptane (cis-), and azo-1-bicyclohexane (cis-) have been generated by UV irradiation of the corresponding trans-isomers.These compounds differ greately in stability, cis- easily surviving at 100 deg C and cis-ada not being isolable.Whereas cis- and cis-only isomerize back to trans on heating, the other two compounds undergo competing loss of nitrogen.The observation that the energy of the transition state for isomerization remains at 42 +/- 1 kcal mol-1 regardless of the cis ground state energy is used to argue that thermal isomerization proceeds via semilinearization rather than rotation.A remarkable correlation of cis ground state energy with cis n,?* excitation energy has emerged from this study.