Journal article
The mechanism of electrophilic addition of singlet oxygen to pyrrolic ring
Theoretical Chemistry Accounts, Vol.138(7)
2019
Abstract
Pyrrolic compounds assume an important role in the chemistry of living organisms, coal surrogates and novel drugs. However, literature reports a few studies on their reactivity towards prominent oxidising agents. This contribution presents a comprehensive mechanistic study of the oxidation of unsubstituted pyrrole with singlet oxygen (O2 1∆g) by deploying a quantum chemical framework leading to the production of succinimide, as the major products, through a Diels–Alder addition of O2 1∆g to the aromatic ring. Other products such as maleimide, hydroperoxide, formamide and epoxide adducts appear to form via insignificant channels. The primary Diels–Alder channel encompasses a barrier of 41 kJ/mol with a fitted rate constant of k(T) = 1.87 × 10−13 exp(− 48,000/RT) cm3 mol−1 s−1. Furthermore, a kinetic study has been undertaken to investigate the influence of substituents on reaction rate of the Diels–Alder addition of singlet oxygen to a pyrrolic ring. The results clarify that electropositive substituents such as BeH and BH2 operate as π-acceptors and thus deactivate the ring towards electrophilic attack of singlet oxygen. However, substituents comprising of strong π-donors, e.g., NH2 and OH, destabilise the ring structure, increasing its oxidation reactivity.
Details
- Title
- The mechanism of electrophilic addition of singlet oxygen to pyrrolic ring
- Authors/Creators
- N. Zeinali (Author/Creator) - Murdoch UniversityI. Oluwoye (Author/Creator) - Murdoch UniversityM. Altarawneh (Author/Creator) - Al-Hussein Bin Talal UniversityB.Z. Dlugogorski (Author/Creator) - Murdoch University
- Publication Details
- Theoretical Chemistry Accounts, Vol.138(7)
- Publisher
- Springer New York
- Identifiers
- 991005541898207891
- Copyright
- © 2019 Springer-Verlag GmbH Germany, part of Springer Nature
- Murdoch Affiliation
- School of Engineering and Energy
- Language
- English
- Resource Type
- Journal article
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