THE CHEMICAL BEHAVIOR OF 2-METHYLENE-2,3-DIHYDRO-3-FURANONES .14. 2-METHOXYCARBONYLMETHYLENE-2,3-DIHYDRO-3-FURANONES IN THE [2-CYCLOADDITION OF DIPHENYLKETENE(2])
Nm. Igidov et al., THE CHEMICAL BEHAVIOR OF 2-METHYLENE-2,3-DIHYDRO-3-FURANONES .14. 2-METHOXYCARBONYLMETHYLENE-2,3-DIHYDRO-3-FURANONES IN THE [2-CYCLOADDITION OF DIPHENYLKETENE(2]), Russian chemical bulletin, 44(2), 1995, pp. 322-325
Diphenylketene undergoes regioselective thermal [2+2]-cycloaddition to
the heterocyclic C(3)=O carbonyl group of 2-methoxycarbonylmethylene-
2,3-dihydrofuran-3-ones and 5-phenyl-2,3-dihydrofuran-2,3-dione to giv
e the corresponding 3-diphenylmethylene derivatives of 2,3-dihydrofura
n.