Compound as reactive (1)

cis-dienelactone + H₂O → 2-maleylacetate + H⁺

Compound as product (3)

(2R)-2-chloro-2,5-dihydro-5-oxofuran-2-acetate → cis-dienelactone + H⁺ + chloride

cis-dienelactone + H⁺ + chloride ← (+)-5-chloromuconolactone

cis-dienelactone + chloride ← 3-chloro-cis,cis-muconate

Reversible reaction (1)

cis-dienelactone + H⁺ + fluoride ↔ (+)-5-fluoromuconolactone