Polyoxometalates catalyst features

Neumann and Fish have studied the novel polyoxometalate salt 25, which features 12 fluorous ammonium cations [12]. This material was insoluble in EtOAc (and toluene) at room temperature, but dissolved at 80 °C to give an effective catalyst system for the oxidation of alkenes and alcohols by 30% aqueous H2O2. CooHng precipitated the catalyst, which was reused. Additional examples of thermomorphic fluorous catalysts have been briefly described in meeting abstracts [60,61] and will Hkely soon appear in the peer-reviewed literature. 

Previous Volumes in this Series have described, in general, practical tips for performing topical reactions. Volume 2 was however dedicated specifically to Catalysis by Polyoxometalates . The present Volume features recent advances in the application of microporous and mesoporous solid catalysts to fine chemical synthesis, a field that is receiving increasing attention because of its high potential for the development of green processes for the synthesis of fine chemicals. 

The structural and spectroscopic features of the photoactive complex are preserved inside the polymeric film, as confirmed by UV-vis spectra. In addition, SEM analysis of both the film surface and cross-section highlight a well-dispersed, homogeneous distribution of the catalyst domains, which appear as spherical particles of approximately 1-2 xm in diameter. The structural similarity of (RfN)4Wio032 with other surfactant encapsulated polyoxometalates (SEPs) suggests the formation of organized domains, similar to spherical onion-like vesicles. ... 

---