Rearrangement of substituted (E)-5,5'-diphenylbifuranylidenediones to 3,7-diphenylpyrano[4,3-c]pyran-1,5-diones

摘要

The rate coefficients for the rearrangement of substituted (E)-5,5'-diphenylbifuranylidenediones to form the corresponding 3,7-diphenylpyrano[4,3-c]pyran-1,5-diones in ethane-1,2-diol at 30.0 det.C, catalysted by sodium acetate, were determined. For the unsubstituted dione, the rate conefficients for there arrangement in various alcohols at 30.0 deg.C, and for there at 59.deg.C, were measured. The reactions wee first order in both substrate and acetate ainon. Rate coefficients were also measured for the catalysis of the rearrangement of the unsubstituted dione in ethanol and ethane- 1,2-diol at 30.0 deg.C by a series of sokdium metalpara-substituted beznoates.