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Trends in Organic Chemistry   Volumes    Volume 21 
Reaction pathways for [2+2] cycloadditions of chlorosulfonyl isocyanate with alkenes
Dale F. Shellhamer, Marc C. Perry
Pages: 19 - 24
Number of pages: 6
Trends in Organic Chemistry
Volume 21 

Copyright © 2020 Research Trends. All rights reserved

The reaction mechanism for [2+2] cycloaddition of chlorosulfonyl isocyanate (CSI) with alkenes is presented. Electron-deficient alkenes react by a concerted pathway while most alkenes, and especially electron-rich alkenes, react by a single electron transfer (SET) pathway to give a 1,4-diradical intermediate. NMR line-broadening studies show that the triplet 1,4-diradical intermediate can be converted to the singlet form at lower temperatures. UV data give evidence for a pre-equilibrium charge transfer complex that is confirmed by kinetic studies. That is, the reaction is more efficient at a lower temperature where the pre-equilibrium favors the charge transfer complex compared to a slightly higher temperature where the pre-equilibrium favors the dissociated reagents. These mechanistic findings were incorporated to enhance the synthetic usefulness of CSI [2+2] cycloaddition reactions.
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