Benzo condensed crown ethers containing 1,8-naphthyridine or 4-pyridone units - synthesis and complex formation with organic guest molecules

New crown compounds 3–5 comprising beside ophenylene groups 1,8‐naphthyridine or 4‐pyridone groups as characteristic building units are synthesized. They form numerous stoichiometric crystalline complexes with uncharged organic molecules including alcohols, nitro compounds and other dipolar‐aprotic solvents, as well as cyclic ethers and aromatic hydrocarbons. Properties of complex formation and host‐guest stoichiometries are discussed making a comparison with parent host analogues.