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Friday, 15 March 2013
18-Crown-6
18-Crown-6 is an organic compound with the formula [C2H4O]6 and the IUPAC name of 1,4,7,10,13,16-hexaoxacyclooctadecane.
It is a white, hygroscopic crystalline solid with a low melting point.
Like other crown ethers, 18-crown-6 functions as a ligand for some metal cations with a particular affinity for potassium cations (binding constant in methanol: 106M-1).
The synthesis of the crown ethers led to the awarding of the Nobel Prize in Chemistry to Charles J. Pedersen.
Crown ethers are used in the laboratory as phase transfer catalysts.
In general however it is not widely used; cheaper and more versatile phase transfer catalysts are known.
In the presence of 18-crown-6, potassium permanganate dissolves in benzene giving the so-called "purple benzene", which can be used to oxidize diverse organic compounds.
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