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J Am Chem Soc. 2004 Feb 11;126(5):1350-1. doi: 10.1021/ja038428w.

Nucleophilic attack by oxyanions on a phosphate monoester dianion: the positive effect of a cationic general Acid.

Journal of the American Chemical Society

Anthony J Kirby, Marcelo F Lima, Davi da Silva, Faruk Nome

Affiliations

  1. University Chemical Laboratory, Cambridge University, Cambridge CB2 1EW, UK. [email protected]

PMID: 14759187 DOI: 10.1021/ja038428w

Abstract

The two negative charges on a phosphate monoester RO-PO32- at neutral pH provide a considerable electrostatic barrier toward reactions with nucleophilic reagents with a negative charge on the attacking atom. Electrostatic repulsion disappears when the hydrolysis of an aryl phosphate monoester is catalyzed by a neighboring cationic general acid. The hydrolysis of 8-dimethylammonium-1-phosphate (1) is catalyzed by oxyanions, fluoride anion, and hydroxylamines at similar rates.

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