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Concave Reagents, 18 . Synthesis, Conformational Behavior, and Basicity of New Pyridine‐Bridged Calix[6]arenes
Author(s) -
Ross Haymo,
Lüning Ulrich
Publication year - 1996
Publication title -
liebigs annalen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 0947-3440
DOI - 10.1002/jlac.199619960905
Subject(s) - chemistry , pyridine , reagent , calixarene , titration , stereochemistry , organic chemistry , molecule
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.