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Title: Mechanistic study of styrene aziridination by iron(IV) nitrides

Journal Article · · Chemical Science
DOI: https://doi.org/10.1039/c8sc03677b · OSTI ID:1471749
 [1];  [2]; ORCiD logo [2]; ORCiD logo [3]
  1. Indiana Univ., Bloomington, IN (United States); Saint Louis Univ., St. Louis, MO (United States)
  2. Indiana Univ., Bloomington, IN (United States)
  3. Institute for Basic Science (IBS), Daejeon (Korea, Republic of); Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of)

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.

Research Organization:
New Mexico State Univ., Las Cruces, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Institute for Basic Science in Korea
Grant/Contract Number:
FG02-08ER15996; IBS-R10-D1
OSTI ID:
1471749
Alternate ID(s):
OSTI ID: 1609964
Journal Information:
Chemical Science, Vol. 9, Issue 45; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (1)

Fe‐Based Complexes as Styrene Aziridination Catalysts: Ligand Substitution Tunes Catalyst Activity journal March 2019