Mechanistic study of styrene aziridination by iron( iv ) nitrides
Abstract
A combined experimental and computational investigation was undertaken to investigate the mechanism of aziridination of styrene by the tris(carbene)borate iron(IV) nitride complex, PhB(tBuIm)3FeN. While mechanistic investigations suggest that aziridination occurs via a reversible, stepwise pathway, it was not possible to confirm the mechanism using only experimental techniques. Density functional theory calculations support a stepwise radical addition mechanism, but suggest that a low-lying triplet (S = 1) state provides the lowest energy path for C–N bond formation (24.6 kcal mol-1) and not the singlet ground (S = 0) state. A second spin flip may take place in order to facilitate ring closure and the formation of the quintet (S = 2) aziridino product. A Hammett analysis shows that electron-withdrawing groups increase the rate of reaction σp (ρ = 1.2 ± 0.2). This finding is supported by the computational results, which show that the rate-determining step drops from 24.6 kcal mol-1 to 18.3 kcal mol-1 when (p-NO2C6H4)CHCH2 is used and slightly increases to 25.5 kcal mol-1 using (p-NMe2C6H4)CHCH2 as the substrate.
- Authors:
-
- Department of Chemistry, Indiana University, Bloomington, USA, Department of Chemistry
- Department of Chemistry, Indiana University, Bloomington, USA
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea, Department of Chemistry
- Publication Date:
- Research Org.:
- New Mexico State Univ., Las Cruces, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Institute for Basic Science in Korea
- OSTI Identifier:
- 1471749
- Alternate Identifier(s):
- OSTI ID: 1609964
- Grant/Contract Number:
- FG02-08ER15996; IBS-R10-D1
- Resource Type:
- Published Article
- Journal Name:
- Chemical Science
- Additional Journal Information:
- Journal Name: Chemical Science Journal Volume: 9 Journal Issue: 45; Journal ID: ISSN 2041-6520
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Crandell, Douglas W., Muñoz, Salvador B., Smith, Jeremy M., and Baik, Mu-Hyun. Mechanistic study of styrene aziridination by iron( iv ) nitrides. United Kingdom: N. p., 2018.
Web. doi:10.1039/C8SC03677B.
Crandell, Douglas W., Muñoz, Salvador B., Smith, Jeremy M., & Baik, Mu-Hyun. Mechanistic study of styrene aziridination by iron( iv ) nitrides. United Kingdom. https://doi.org/10.1039/C8SC03677B
Crandell, Douglas W., Muñoz, Salvador B., Smith, Jeremy M., and Baik, Mu-Hyun. Wed .
"Mechanistic study of styrene aziridination by iron( iv ) nitrides". United Kingdom. https://doi.org/10.1039/C8SC03677B.
@article{osti_1471749,
title = {Mechanistic study of styrene aziridination by iron( iv ) nitrides},
author = {Crandell, Douglas W. and Muñoz, Salvador B. and Smith, Jeremy M. and Baik, Mu-Hyun},
abstractNote = {A combined experimental and computational investigation was undertaken to investigate the mechanism of aziridination of styrene by the tris(carbene)borate iron(IV) nitride complex, PhB(tBuIm)3FeN. While mechanistic investigations suggest that aziridination occurs via a reversible, stepwise pathway, it was not possible to confirm the mechanism using only experimental techniques. Density functional theory calculations support a stepwise radical addition mechanism, but suggest that a low-lying triplet (S = 1) state provides the lowest energy path for C–N bond formation (24.6 kcal mol-1) and not the singlet ground (S = 0) state. A second spin flip may take place in order to facilitate ring closure and the formation of the quintet (S = 2) aziridino product. A Hammett analysis shows that electron-withdrawing groups increase the rate of reaction σp (ρ = 1.2 ± 0.2). This finding is supported by the computational results, which show that the rate-determining step drops from 24.6 kcal mol-1 to 18.3 kcal mol-1 when (p-NO2C6H4)CHCH2 is used and slightly increases to 25.5 kcal mol-1 using (p-NMe2C6H4)CHCH2 as the substrate.},
doi = {10.1039/C8SC03677B},
journal = {Chemical Science},
number = 45,
volume = 9,
place = {United Kingdom},
year = {2018},
month = {11}
}
https://doi.org/10.1039/C8SC03677B
Web of Science
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