VII. Compounds with Sulfur–Hydrogen or Selenium–Hydrogen Bonds
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- 24672
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The rate constants for hydrogen-atom abstraction from sulfur–hydrogen and selenium–hydrogen bonds are so rapid [kSH = 1.5 x 108 M-1s-1 (from C6H5SH) and kSeH = 2.1 x 109 M-1s-1 (from C6H5SeH)] that abstraction typically will take place before other radical reactions (e.g., addition, cyclization, and rearrangement) can occur. (Rate constants for hydrogen-atom abstraction from various, hydrogen-atom donors, as well as rate constants for other radical reactions are given in Chapter 8 of Volume I.)