A phosphonate ester contains a phosphorus-carbon bond and esterified phosphorus-oxygen groups, commonly represented as . The carbon bonded directly to phosphorus distinguishes this framework from an ordinary phosphate ester.
Changing the organic groups changes solubility and reactivity while retaining the phosphorus-containing functional group. Phosphonate esters are consequently useful intermediates for forming carbon-carbon bonds in organic synthesis.
A phosphonate with an adjacent ester-bearing carbon that can supply the carbon nucleophile in a Horner–Wadsworth–Emmons olefination.
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