Seeking reference where potassium and amino group interactions (like in crown ethers, calixarenes) were mentioned.
Http://onlinelibrary.wiley.com/doi/10.1002/anie.199724521/abstract
http://pubs.acs.org/doi/abs/10.1021/ja049013t
http://pubs.acs.org/doi/abs/10.1021/ol051603o
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