Abstract 2‐Pyridine sulfenyl chloride (PS‐Cl) is a useful reagent for simultaneously deprotecting and activating the mercapto‐group of cysteine and of cysteine‐peptides preliminary to disufide‐bond formation. The S ‐protecting groups that are amenable to this reaction include trityl, diphenylmethyl, acetamidomethyl, t ‐butyl, and t ‐butylsulfenyl.
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Castell et al. (1979) studied this question.
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