Energetics and structural mechanisms of photochemical processes in molecules of aldonitrone vinylogs View Full Text


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Article Info

DATE

1990-10

AUTHORS

A. V. Metelitsa, M. I. Knyazhanskii, N. V. Volbushko, V. S. Nedzvetskii, V. I. Minkin

ABSTRACT

Depending on the multiplicity of the excited state, alternative photoreactions are realized in methoxy and acetoxy derivatives of aldonitrone vinylogs: diabatic nitrone-oxazypyridone rearrangement in the first excited singlet state and E-Z isomerization involving the C=N bond in the triplet state. In the case of aldonitrone vinylogs with an o-hydroxy group in the α-aryl ring one observed adiabatic proton transfer from the hydroxy group to the azotoxido group with a subsequent diabatic reaction involving cyclization to the 2H-chromene structure. The same transfer is also realized in the triplet state. The quantum yields were determined, and the energies of activation of the photoreactions and the reverse thermal processes were evaluated. More... »

PAGES

1145-1149

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00472188

DOI

http://dx.doi.org/10.1007/bf00472188

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1026474385


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