Photochemical condensation between dibenzo-18-crown-6 and ethyl N-chloroacetylglycinate (1a) was depressed by the presence of potassium ion; this behaviour is considered to originate from an increase in the ionisation potential of the crown ether on complexation.
M. Tada, A. Suzuki and H. Hirano, J. Chem. Soc., Chem. Commun., 1979, 1004 DOI: 10.1039/C39790001004
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