The general procedure A from (S,RP)-S-tert-butyl-2-(trimethylsilyl)ferrocenesulfoxide (S,RP-1a; 0.39 g, 1.1 mmol) and using I2 (0.35 g) in THF (5 mL) afforded (eluent: petroleum ether-EtOAc 40:60; Rf = 0.89) the title product in 81% yield (425 mg) as a yellow solid. The analyses are as reported previously [46].
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