Paper
A combined experimental and density functional study of 1‐(arylsulfonyl)‐2‐R‐4‐chloro‐2‐butenes reactivity towards the allylic chlorine
Published Jun 1, 2015 · S. Bondarchuk, V. V. Smalius, B. Minaev
Journal of Physical Organic Chemistry
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Abstract
Nucleophilic substitution and dehydrochlorination reactions of a number of the ring-substituted 1-(arylsulfonyl)-2-R-4-chloro-2-butenes are studied both experimentally and theoretically. The developed synthetic procedures are characterized by a general rapidity, cheapness, and simplicity providing moderate to high yields of 1-arylsulfonyl 1,3-butadienes (48–95%), 1-(arylsulfonyl)-2-R-4-(N,N-dialkylamino)-2-butenes (31–53%), 1-(arylsulfonyl)-2-R-2-buten-4-ols (37–61%), and bis[4-(arylsulfonyl)-3-R-but-2-enyl]sulfides (40–70%). The density functional theory B3LYP/6-311++G(2d,2p) calculations of the intermediate allylic cations in acetone revealed their high stability occurring from a resonance stabilization and hyperconjugation by the SO2Ar group. The reactivity parameters estimated at the bond critical points of the diene/allylic moiety display a high correlation (R2 > 0.97) with the Hammett (σp) constants. 1-Arylsulfonyl 1,3-butadienes are characterized by a partly broken π conjugated system, which follows from analysis of the two-centered delocalization (δ) and localization (λ) index values. The highest occupied molecular orbital energies of 1-arylsulfonyl 1,3-butadienes are lower than those of 1,3-butadiene explaining their low reactivity towards the Diels–Alder condensation. Copyright © 2015 John Wiley & Sons, Ltd.
1-(arylsulfonyl)-2-R-4-chloro-2-butenes show high stability and reactivity towards allylic chlorine, making them suitable for rapid, inexpensive, and simple synthetic procedures.
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