Sulfur dioxide extrusion from 3,5-disubstituted sulfolenes

2 Sulfur Dioxide Extrusion from 2,5-Disubstituted Sulfolenes [Pg.263]

Orbital symmetry arguments imply that thermal sulfolene opening reactions should follow a disrotatory mode of reaction, and this prediction was confirmed experimentally [82,85-87]. When heated, cfs-2,5-dimethyl-3-sulfolene (168) was [Pg.263]

John Leonard, Andrew B. Hague and John A. Knight [Pg.264]

From a practical point of view, disrotatory extrusion of SO2 can be assumed for thermal reactions, and the geometry of the diene formed is therefore dictated by the stereochemistry of the sulfolene precursor. [Pg.264]

The reactions are instantaneous with the frans-dialkylated 3-sulfolenes giving 8 1 [Pg.264]

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