Volume 133, Issue 9 pp. 4846-4853
Forschungsartikel

C−H Activation by an Iron-Nitrido Bis-Pocket Porphyrin Species

Dr. Hai-Xu Wang

Dr. Hai-Xu Wang

State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China

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Dr. Liangliang Wu

Dr. Liangliang Wu

State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China

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Bin Zheng

Bin Zheng

State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China

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Dr. Lili Du

Dr. Lili Du

State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China

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Dr. Wai-Pong To

Dr. Wai-Pong To

State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China

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Cheng-Hoi Ko

Cheng-Hoi Ko

State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China

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Prof. Dr. David Lee Phillips

Corresponding Author

Prof. Dr. David Lee Phillips

State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China

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Prof. Dr. Chi-Ming Che

Corresponding Author

Prof. Dr. Chi-Ming Che

State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China

HKU Shenzhen Institute of Research & Innovation, Shenzhen, China

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First published: 17 November 2020
Citations: 1

Dedicated to Professor Harry B. Gray on the occasion of his 85th birthday

Abstract

High-valent iron-nitrido species are nitrogen analogues of iron-oxo species which are versatile reagents for C−H oxidation. Nonetheless, C−H activation by iron-nitrido species has been scarcely explored, as this is often hampered by their instability and short lifetime in solutions. Herein, the hydrogen atom transfer (HAT) reactivity of an Fe porphyrin nitrido species (2 c) toward C−H substrates was studied in solutions at room temperature, which was achieved by nanosecond laser flash photolysis (LFP) of its FeIII-azido precursor (1 c) supported by a bulky bis-pocket porphyrin ligand. C−H bonds with bond dissociation enthalpies (BDEs) of up to ≈84 kcal mol−1 could be activated, and the second-order rate constants (k2) are on the order of 102–104 s−1m−1. The Fe-amido product formed after HAT could further release ammonia upon protonation.

Conflict of interest

The authors declare no conflict of interest.

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