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Rank the following electrophiles in order of decreasing reactivity with NaN3 in DMF. (1 = most reactive)
The only differences among these three molecules is their leaving groups, so whichever has the best leaving group will react fastest with the nucleophile (azide, N3-). Stable molecules make good leaving groups, so the best leaving group of the three is SO3R-, which has has three resonance forms (see problem 535). So the third compound will react the fastest with NaN3.
