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New Insights on the Mechanism of Thermal Cleavage of Unsaturated Bicyclic Diaziridines: A DFT Study

New Insights on the Mechanism of Thermal Cleavage of Unsaturated Bicyclic Diaziridines: A DFT Study A DFT calculations are carried out at UB3LYP/6‐311++G (3df, 2p) levels of theory to study electrocyclic thermal cleavage of four (R) derivatives of unsaturated bicyclic diaziridines, 1X‐R, to produce corresponding (Z) and (E) azomethine imides (2X‐Z, 2X‐E, 3X‐Z and 3X‐E), where X=H, Me, t‐Bu and Ph. Cleavage of 1X‐R series to form the most stable 3X‐Z product, (path 2) is found the favored procedure because of delocalized negative charge on five atoms and lower steric effect in related transition state. According to IRC calculations in paths 1 and 2, C6N1 bond is cleaved before the rate determinating step (transition state). The stability of unsaturated bicyclic diaziridines and their corresponding (Z) and (E) azomethine imides is in the following order in gas phase and chloroform, tetrahydrofuran, and acetone solvents: 3X‐Z<3X‐E<2X‐Z<2X‐E<1X‐R<1X‐S. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Chinese Journal of Chemistry Wiley

New Insights on the Mechanism of Thermal Cleavage of Unsaturated Bicyclic Diaziridines: A DFT Study

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References (28)

Publisher
Wiley
Copyright
Copyright © 2011 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1001-604X
eISSN
1614-7065
DOI
10.1002/cjoc.201180253
Publisher site
See Article on Publisher Site

Abstract

A DFT calculations are carried out at UB3LYP/6‐311++G (3df, 2p) levels of theory to study electrocyclic thermal cleavage of four (R) derivatives of unsaturated bicyclic diaziridines, 1X‐R, to produce corresponding (Z) and (E) azomethine imides (2X‐Z, 2X‐E, 3X‐Z and 3X‐E), where X=H, Me, t‐Bu and Ph. Cleavage of 1X‐R series to form the most stable 3X‐Z product, (path 2) is found the favored procedure because of delocalized negative charge on five atoms and lower steric effect in related transition state. According to IRC calculations in paths 1 and 2, C6N1 bond is cleaved before the rate determinating step (transition state). The stability of unsaturated bicyclic diaziridines and their corresponding (Z) and (E) azomethine imides is in the following order in gas phase and chloroform, tetrahydrofuran, and acetone solvents: 3X‐Z<3X‐E<2X‐Z<2X‐E<1X‐R<1X‐S.

Journal

Chinese Journal of ChemistryWiley

Published: Jul 1, 2011

Keywords: ; ; ; ; ;

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