Abstract
Abstract Triethylphosphonoacetate (I) reacts with p-quinones (1, 2) to give the corresponding 4-hydroxyl-β-hydroxy-succinic acid diethyl acetate 4 and 5, respectively. On the other hand, the reaction of Wittig-Horner reagent (I) with p-chloranil (3) afforded 2,3,5,6-tetrachloro-4-hydroxyphenyl-β-hydroxy-succinic acid diethyl acetate (7) and the diethyl phosphonate adduct (6). Possible reaction mechanisms are considered and the structural assignments are based on compatible analytical and spectroscopic results.
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