Macrocyclic ethers containing nine oxygen atoms complex guanidinium tetraphenylborate or hexafluorophosphate, and formation of the cycles is aided by guanidinium as compared to tetramethylguanidinium ion.
K. Madan and D. J. Cram, J. Chem. Soc., Chem. Commun., 1975, 427 DOI: 10.1039/C39750000427
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