Corrigendum: An Extremely Long-Lived Singlet 4,4-Dimethoxy-3,5-diphenylpyrazolidine-3,5-diyl Derivative: A Notable Nitrogen-Atom Effect on Intra- and Intermolecular Reactivity
Article first published online: 21 NOV 2012
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Angewandte Chemie International Edition
Volume 51, Issue 48, page 11924, November 26, 2012
How to Cite
- Issue published online: 21 NOV 2012
- Article first published online: 21 NOV 2012
Vol. 45, Issue 46, 7828–7831, Article first published online: 24 OCT 2006
- quantum chemical calculations;
- reactive intermediates;
- singlet diradicals
In Scheme 1 of this Communication, formation of the MeO-migrated compound 10 a was reported for the photochemical denitrogenation of azoalkane AZ in benzene. 2D NMR spectroscopic analyses (HMBC, HMQC) of this reaction have now revealed that the product is not compound 10 a but compound 10 a′.
The HMBC spectrum (see the Supporting Information) shows a clear correlation between the protons of one MeO group (δ=3.31 ppm) and one carbonyl carbon atom (δ=154.74 ppm) as well as the protons of another MeO group (δ=3.14 ppm) and enolic C4 carbon atom (δ=144.37 ppm). These correlations are not consistent with structure 10 a but with structure 10 a′.