1976 Volume 49 Issue 12 Pages 3584-3588
The competitive addition of sodium hydrogensulfite to allyl and 2-methylallyl alcohols was investigated at the pH range from 3 to 5. The relative reactivity of allyl alcohol to 2-methylallyl alcohol decreased with increasing pH. Sulfite radical ion was mainly participating in the addition at pH 5, and hydrogensulfite radical at pH 3. From the kinetic analysis of the pH dependence, the ratio of reactivities of allyl alcohol and 2-methylallyl alcohol toward sulfite radical ion was 0.213, and the same ratio toward hydrogensulfite radical was 0.305. Further, the ratio of reactivities of hydrogensulfite radical and sulfite radical ion toward allyl alcohol was 1.32, and the same ratio toward 2-methylallyl alcohol was 0.927. The dissociation constant of hydrogensulfite radical was the order of 3×10−5(pKa=4.5).
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