Concave Reagents, 18. Synthesis, Conformational Behavior, and Basicity of New Pyridine‐Bridged Calix[6]arenes

This is the authors' abstract. We don't add key points for this paper.

Compounds 2–6 were synthesized by starting from the pyridine‐bridged calix[6]arenes 1 . Most of these derivatives exist in a concave conformation like their parent compounds 1 , but in some cases the conformational behavior is different. Relative basicities of 1–6 and of the open‐chain model compounds 7 were measured by a photometrical titration against thymol blue. An unexpectedly high basicity of 1–4 was found.