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| Cheletropic Addition of SO2 |
- Reaction involving two sigma bonds directed to a single atom of a ring are made or broken concertedly resulting in decrease or increase of one pi bond. An example is the reversible addition of sulfur dioxide to 1,3-butadiene shown here.
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- ΔH° = –16.5 kcal/mole
- Below 100°C the equilibrium favors the addition product with ΔH° = –16.5 kcal/mole. Above 100°C the cyclic sulfone decomposes to 1,3-butadiene.The equilibrium constant is close to unity at 100°C.The entropy change calculated is as follows:-
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