“…[6,7] Whilst it is stable against most acidic, basic, and oxidative reaction conditions and also common reducing agents, it can be cleaved under electron-transfer conditions, such as Na/NH 3 , [8] radical anions, [9] SmI 2 , [10] or electrolysis, [11] in a mild fashion. Our interest in the implementation of electron-transfer conditions in SPOS [12] has motivated us to take advantage of these opportunities to establish a reductively cleavable linker system. [13] Starting from inexpensive polystyrene sulfonyl chloride (1; loading 1.5 mmol g À1 , 1 % DVB, 100-200 mesh), olefinic secondary amines 2 were immobilized on the solid support.…”