Abstract
A large number of iodine atoms can be introduced into a single molecule in a one-pot reaction using trifluoroperacetic acid-mediated electrophilic iodination methodology. The scope of this reaction was investigated extensively using several pyrazole substrates which resulted in nine polyiodo pyrazole compounds with iodine content as high as 80%. This synthetic methodology was also utilized successfully for iodination of benzimidazoles. Tetraiodobenzimidazole was nitrated with 100% nitric acid to give a high yield of 4,5,6,7-tetranitro-1H-benzimidazol-2(3H)-one (14). All of these materials were fully characterized and compounds 5, 9, 10 and 14 were confirmed further with single crystal X-ray analysis. High density, positive oxygen balance, and very good impact sensitivity values characterize 14. For the first time, two 1,2,5-oxadiazole-N-oxide rings were introduced into a benzimidazole ring (11) which remarkably improves the stability of oxadiazole-N-oxide compounds.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 13827-13833 |
| Number of pages | 7 |
| Journal | Dalton Transactions |
| Volume | 45 |
| Issue number | 35 |
| DOIs | |
| State | Published - 2016 |
Bibliographical note
Funding Information:The authors are grateful for the support of ONR (N00014-16-1-2089), and the Defense Threat Reduction Agency (HDTRA 1-15-1-0028). We deeply appreciate the help of Dr Jerry Boatz, Air Force Research Laboratory, Edwards Airforce Base, CA for the calculation of the heat of formation for.
Publisher Copyright:
© The Royal Society of Chemistry 2016.
Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.