A stable enol in small ring systems: clear differentiation between penta- and tri-valency of phosphorus atoms.

Abstract

The first stable enols in 1,2-dihydrophosphetes and were synthesized and structurally characterized with intermolecular hydrogen bonds to phosphoryl groups in 10-membered dimeric structures; in contrast, trivalent analogue exists in keto-form, where such stabilization by hydrogen bonds is not feasible. 
DOI: 10.1039/b809877h

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