Concave Reagents, 18. Synthesis, Conformational Behavior, and Basicity of New Pyridine‐Bridged Calix[6]arenes
- 1 September 1996
- journal article
- research article
- Published by Wiley in European Journal of Organic Chemistry
- Vol. 1996 (9) , 1367-1373
- https://doi.org/10.1002/jlac.199619960905
Abstract
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.Keywords
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