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Cover Picture: Osmium(III) and Osmium(V) Complexes Bearing a Macrocyclic Ligand: A Simple and Efficient Catalytic System for cis ‐Dihydroxylation of Alkenes with Hydrogen Peroxide (Chem. Asian J. 9/2013)
Author(s) -
Sugimoto Hideki,
Ashikari Kenji,
Itoh Shinobu
Publication year - 2013
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201390029
Subject(s) - osmium , dihydroxylation , chemistry , vicinal , alkene , hydrogen peroxide , catalysis , adduct , ligand (biochemistry) , diol , peroxide , medicinal chemistry , photochemistry , stereochemistry , polymer chemistry , ruthenium , organic chemistry , enantioselective synthesis , biochemistry , receptor
Selective cis ‐dihydroxylation of alkenes has been achieved by a simple protocol in which an osmium complex supported by a cyclic tetradentate ligand was used as a catalyst and hydrogen peroxide as a terminal oxidant, as reported by Hideki Sugimoto et al. in their Full Paper on page 2154 ff. A number of alkenes including those that contain electron‐withdrawing groups were converted into the corresponding vicinal diols in a completely syn ‐selective manner. The active oxidant was identified as the oxo‐hydroxo‐osmium(V) species, which is formed through the hydroperoxide adduct of the Os III (OOH) species. The Cover picture illustrates vicinal diol production as hydrogen peroxide and an alkene pass the gate‐like shaped osmium catalyst on the conveyor belt.