S. Marchalin et al., 2-(5-PHENOXY-2-FURYLMETHYLENE)-1,3-DIKETONES - NEW EFFECTIVE SYNTHON FOR 4-ALKYLIDENEBUTE-NOLIDES PREPARATION, Chemicke listy, 91(9), 1997, pp. 654-655
Acid hydrolysis of 2-(5-phenoxy-2-furylmethylene)-1,3-diketones gives
4-alkylidenebutenolides. The latter give, when treated with the methan
olic hydrogen chloride, different products.