for the selective synthesis of cyclic sulfites from epoxides and sulfurdioxide, demonstrating the effects of immobilizing the homogeneous catalysts on silica. The cycloaddition of sulfurdioxide to various epoxides was conducted under solvent‐free conditions at 100 °C. The quaternary ammonium‐ and amino‐functionalized silica catalysts produced cyclic sulfites in high yields (79–96 %) that are comparable
Reactions of 4-chloromethyl-1,3,2-dioxathiolane 2-oxides with sodium phenoxide. A reinvestigation
作者:Z. A. Bredikhina、A. V. Pashagin、A. A. Bredikhin
DOI:10.1007/bf02496348
日期:2000.10
The reactions of 4-chloromethyl-1,3,2-dioxathiolane 2-oxides with PhONa in EtOH are accompanied by ring opening under the action of the ethoxide ion rather than leading to a rearrangement of the starting molecule as has been assumed previously. Under conditions precluding competition with other nucleophiles, the phenoxide anion smoothly replaces the chlorine atom in chloromethyl-substituted cyclic