Triethyl and triisopropyl phosphites, when reacting with 2-furaldehyde and with benzaldehyde, are partially oxidized to phosphoric esters with formation of 2,2′-vinylenedifuran and stilbene, respectively.
When triethyl phosphite reacts with 2-furoic acid and with 2-furanacrylic acid, the ethyl esters of these acids are formed. In the case of 2-furanacrylic acid, not only the formation of a 2-furanacrylic ester occurs, but also the addition of the trialkyl phosphite to 2-furanacrylic acid.
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Arbuzov, B.A., Zoroastrova, V.M. Synthesis of phosphonic esters containing heterocyclic groups. Russ Chem Bull 9, 962–965 (1960). https://doi.org/10.1007/BF00903969
- Ethyl Ester