I. Petnehazy et al., MECHANISM OF THE REACTION OF TRIALKYL PHOSPHITES WITH CHALCONES, Phosphorus, sulfur and silicon and the related elements, 75(1-4), 1993, pp. 103-106
According to our kinetic measurements the nucleophilic attack of trial
kyl phosphite can occur both on the carbonyl carbon and on the C=C dou
ble bond of chalcone producing oxaphospholene ring.