Round 15: Tossup 1

Lawrence Que’s (“kay’s”) group used a two-state model to describe this phenomenon in non-heme oxo-iron complexes. This chemical phenomenon reinforces polyunsaturated fatty acids by inhibiting their peroxidation. This phenomenon is reversed in alkyl metal hydrides when agostic interactions occur in the transition state. Two types of this phenomenon are related by a power law whose exponent is 1.442 (10[1])in the Swain equation. The effects of tunneling on this phenomenon are accounted for by adding Bell’s Q-factor (10[1])to the Arrhenius (-5[1])equation. (10[1])“Primary” and “secondary” forms of this phenomenon (10[1])differ based on whether bonds (10[1])to the affected atom are formed or broken, and are determined (10[1])through deuterium substitution (10[1])experiments. (10[3]-5[1])For 10 points, name this effect (10[1])in (10[1])which reaction (10[1])rate changes (-5[1])when an element is replaced (10[1])with an analog (10[1])of a (10[1])different (10[1])mass. (10[1])■END■ (10[4]0[1])

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