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Low-valent Chemistry: An Alternative Approach To Phosphorus-containing Oligomers.

S. Kosnik, G. J. Farrar, Erin L Norton, Benjamin F. T. Cooper, B. Ellis, C. Macdonald
Published 2014 · Chemistry, Medicine

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A convenient preparative approach to low-valent phosphorus-rich oligomers is presented. Ligand substitution reactions involving anionic diphosphine ligands of the form [(PR2)2N](-) and [(PPh2)2C5H3](-) and a triphosphenium bromide P(I) precursor result in the formation of phosphorus(I)-containing heterocycles, several of which are of types that have never been prepared before. The methodology described also allows for the preparation of the known heterocycle cyclo-[P(PPh2)N(PPh2)]2 in better yields and purity than the synthetic approach reported previously. Preliminary reactivity studies demonstrate the viability of such zwitterionic oligomers as multidentate ligands for transition metals.
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