[longlifepill]

      My recent experiment was blocked by a key step that reducing R-SO2Cl groop to R-SH. One of the problem is how to identification mercapto group by treated  TLC plate in simple way? Though the foul smell appeared during the reaction, the prodcut was complex that not easy to distinguish which spot was my target molecule by TLC.
     

[discodermolide]

      My recent experiment was blocked by a key step that reducing R-SO2Cl groop to R-SH. One of the problem is how to identification mercapto group by treated  TLC plate in simple way? Though the foul smell appeared during the reaction, the prodcut was complex that not easy to distinguish which spot was my target molecule by TLC.
     

Permanganate solution and heat ?

[Honclbrif]

Another vote for basic permanganate. Goes through thiols, alkenes, and alkynes like a flaming sword. Nice light spot on a purple background.

You might also have some luck with iron or copper. They tend to form colored complexes with mercaptans.