Round 12: Tossup 9

These compounds exhibit the captodative (“CAP-toe-DAY-tiv”) effect when they have both electron-withdrawing and electron-donating groups. TEMPO is a “persistent” one of these compounds used as a probe in EPR spectroscopy, which can identify these compounds from their paramagnetism. These compounds are formed when UV light overcomes the bond-dissociation energy in homolytic cleavage. (10[1])“Fish-hooks” are used in arrow-pushing mechanisms (10[1])involving these compounds. Reactive oxygen (10[1])species and these compounds can be “scavenged” by vitamin C and other antioxidants. (10[1])For 10 points, name these highly reactive compounds with an unpaired valence electron. ■END■ (10[1]0[2])

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