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2,2'-Dipyridyldisulfide, sometimes known as DPS, is used for preparing thiols and activating or protecting carboxylic acid with triphenylphosphine in the following reaction.
Uses
It is also used in molecular biology as an oxidising agent, for example to oxidise free thiols to form disulfide bonds in proteins.
References
2,2'-Dipyridyldisulfide Wikipedia(Text) CC BY-SA