Phosphazene Preparation, Reaction and Catalytic Role

Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki Aza Aoba 6-3, Aoba-ku, Sendai 980-8578, Japan 

The representative of a phosphazene base was first prepared in the 1970s [1] and, subsequently, simple, large scale syntheses of tris(diaIkylamino)iminophophoranes and tris(dialkylamino)-A-alkyliminophosphoranes (the PI phosphazene bases) were developed [2]. Furthermore, a (dma)3P=N- unit on phosphorus for synthesizing highly nucleophilic tris[tris(dimethylamino)phosphinimino]phosphine was employed. The homologation 

Superbases for Organic Synthesis Guanidines, Amidines, Phosphazenes and Related Organocatalysts Edited by Tsutomu Ishikawa 2009 John Wiley Sons, Ltd. ISBN 978-0-470-51800-7 

A density functional theory (B3LYP/6-311 - -G ), ab initio (HF/3-21G ) and semi-empirical (PM3) study of intrinsic basicities, protonation energies or protonation enthalpies of phosphazene bases has been reported. The study shows that the organic superbases can reach the basicity level of the strongest inorganic superbases, such as alkali metal 

UV photoelectron spectroscopy was used to investigate the electronic structure of phosphazene bases. The spectral assignment was based on the band intensities, Hel/Hell 

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Phosphazene Preparation, Reaction and Catalytic Role BrCHgCOOEt... 

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