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Crown ethers possessing an external chain are called lariat ethers. Huisgen cycloaddition is the 1,3-dipolar cycloaddition occurs between a suitable azide and terminal alkyne to give a stable 1,2,3-triazole system. It is the most common reaction of the so called philosophy of “click chemistry,” introduced by Nobel prize laureate Sharpless.
The authors thank for financial support the “Grant for Young Scientists - 201536/E-345/M/2016.”
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