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(a) Reaction of 2-mercaptobenzothiazole with NIS and treatment of the crude thus obtained with [1.1.1]propellane and (b) reactions in the presence of radical inhibitors. All yields determined by 1H NMR with an internal standard. BHT denotes 2,6-bis(tert-butyl)-4-methylphenol, and TEMPO 2,2,5,5-tetramethyl-4-piperidin-1-oxyl.
