This chemist erroneously predicted that a certain cyclization undergoes a two-plus-two mechanism followed by a migratory insertion, which was corrected by E. J. Corey’s three-plus-two mechanism (-5[1])in a decade-long feud. A reaction named for this chemist (-5[1])expands on one developed by the Upjohn Company (10[2])and may use a (10[1])commercial (10[1])“AD (10[1])(“A-D”) mix” (10[1])containing various potassium salts and a (10[1])quinine ligand. This chemist is the alphabetically latest of the developers of a copper-catalyzed (-5[1])variant of (10[1])the (10[1])Huisgen (“HOUSE-gun”) cycloaddition, which reacts an azide (10[1])with an alkyne. This chemist names an alkene dihydroxylation (10[3])that uses osmium (10[1])tetroxide, as well (10[2])as an asymmetric epoxidation. (10[3])For 10 (10[1])points, (10[2])name this American chemist (10[1])who coined the term “click (10[1])chemistry” (10[3]-5[2])and twice (10[1]-5[1])received the Nobel Prize (10[2])in Chemistry. (10[3])■END■ (10[2]0[37])