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Exceedingly Fast Oxygen Atom Transfer to Olefins via a Catalytically Competent Nonheme Iron Species
Author(s) -
SerranoPlana Joan,
Aguinaco Almudena,
Belda Raquel,
GarcíaEspaña Enrique,
Basallote Manuel G.,
Company Anna,
Costas Miquel
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201601396
Subject(s) - chemistry , steric effects , peracetic acid , catalysis , substrate (aquarium) , oxygen atom , metastability , photochemistry , oxygen , atom (system on chip) , reaction rate , medicinal chemistry , stereochemistry , organic chemistry , molecule , oceanography , computer science , embedded system , geology , hydrogen peroxide
The reaction of [Fe(CF 3 SO 3 ) 2 (PyNMe 3 )] with excess peracetic acid at −40 °C leads to the accumulation of a metastable compound that exists as a pair of electromeric species, [Fe III (OOAc)(PyNMe 3 )] 2+ and [Fe V (O)(OAc)(PyNMe 3 )] 2+ , in fast equilibrium. Stopped‐flow UV/Vis analysis confirmed that oxygen atom transfer (OAT) from these electromeric species to olefinic substrates is exceedingly fast, forming epoxides with stereoretention. The impact of the electronic and steric properties of the substrate on the reaction rate could be elucidated, and the relative reactivities determined for the catalytic oxidations could be reproduced by kinetic studies. The observed fast reaction rates and high selectivities demonstrate that this metastable compound is a truly competent OAT intermediate of relevance for nonheme iron catalyzed epoxidations.