Thermalrearrangement of mono-, di-, and triphenyl-substituted ketene ethylene acetals was studied. Pyrolysis of all of these acetals provided phenyl-substituted tetrahydro-2-furanones as a major product. The more phenyl groups substitute on the ketene acetal skeleton, the lower reaction temperature was required for the rearrangement. In the cases of the diphenylketene acetals at high temperatures
Control of Product in the Reaction of Tributyltin ω-Haloalkoxide (<i>n</i>-Bu<sub>3</sub>SnO(CH<sub>2</sub>)<i><sub>n</sub></i>X) with Diphenylketene
作者:Ikuya Shibata、Akio Baba、Haruo Matsuda
DOI:10.1246/bcsj.59.4000
日期:1986.12
The reaction of tributyltin ω-haloalkoxide with diphenylketene gave cyclic ketene acetals and/or lactones, and the ratio of these products were controled by the number of methylene groups and by the addition of Lewis base in the reaction system. Moreover, the direct cycloaddition of diphenylketene with cyclic ethers proceeded in high yields, catalyzed by organotin halide–Lewis base complexes.