Olah reagent
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The Olah reagent is a nucleophilic fluorinating agent. It consists of a mixture of 70% hydrogen fluoride and 30% pyridine; alcohols react with this reagent to give alkyl fluorides:
![](http://upload.wikimedia.org/wikipedia/commons/1/1f/Olah%27_reagent.png)
It acts as a stabilized, less volatile form of hydrogen fluoride. It is used in the fluorination of steroids and in deprotection of peptides.[1][2][3] Instead of hydrogen fluoride, several other fluorinating agents can be used, such as diethylaminosulfur trifluoride (DAST).
![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Olah_reaction_example.png/700px-Olah_reaction_example.png)