Calix[n]arenes. IV. Interaction of tert‐Butylcalix[n]arenes with Cyclic Amines

Abstract p‐tert Butylcalix[n]arenes 1 and 2 react with the cyclic amines 3–8, 10 by proton transfer forming so‐called „exo‐complexes”︁ between the ammonium and phenolate groups. As well endocyclic as exocyclic amino groups are reactive. The nitroxyl radical 9does not react with 1 or 2 by the proton transfer reaction. These results demonstrate that an interaction between the nitrogen atom of HALS‐compounds, esp. compound 10, with calix[n]arene hydroxylgroups is possible, but an interaction between the corresponding nitroxyl radicals with calix[n]arene hydroxylgroups does not occur.