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Dendritic Phosphonates and the in situ Assembly of Polyperoxophosphotungstates: Synthesis and Catalytic Epoxidation of Alkenes with Hydrogen Peroxide

✍ Scribed by Maxym V. Vasylyev; Didier Astruc; Ronny Neumann

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
121 KB
Volume
347
Category
Article
ISSN
1615-4150

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✦ Synopsis

First and second-generation rigid dendrimers based on polyphenylated tetrahedral adamantane cores with four or sixteen peripheral phosphonate moieties, PD1 and PD2, respectively, were synthesized and characterized. Further reaction of the dendritic phosphonates with tungstic acid in the presence of hydrogen peroxide led to the stepwise in situ formation of mono-and dinuclear phosphoperoxotungstates. These assemblies were effective catalysts for the epoxidation of alkenes in an aqueous acetonitrile solvent.

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Synthesis of di-nitrogen Schiff base complexes of methyltrioxorhenium(VII) and their application in epoxidation with aqueous hydrogen peroxide as oxidant
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## Abstract Several di‐nitrogen Schiff bases were synthesized through the condensation of 2‐pyridinecarboxaldehyde with primary amines. The Schiff bases as ligands coordinated with methyltrioxorhenium (MTO) smoothly to afford the correspondent complexes which were characterized by IR, ^1^H NMR, ^13