<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Arylboronic acids with strong electron‐withdrawing groups (e.g., 4‐CHO, 4‐Ac or 4‐COOH) do not react with compound (I) and also diallyl and di‐tert‐butyl disulfides fail in the reaction with (IIa).</p> </abstract>