Macrocyclic and heterocyclic chemistry

In chemistry, a macrocyclic ligand is a macrocycle with a ring size of at least nine (including all hetero atoms) and three or more donor sites. Classic examples are crown ethers and porphyrins. Macrocyclic ligands exhibit particularly high affinity for metal ions. Heterocyclic compound, also called heterocycle, any of a major class of organic chemical compounds characterized by the fact that some or all of the atoms in their molecules are joined in rings containing at least one atom of an element other than carbon (C). The cyclic part (from Greek kyklos, meaning “circle”) of heterocyclic indicates that at least one ring structure is present in such a compound, while the prefix hetero- (from Greek heteros, meaning “other” or “different”) refers to the noncarbon atoms, or heteroatoms, in the ring. In their general structure, heterocyclic compounds resemble cyclic organic compounds that incorporate only carbon atoms in the rings.

 

  • Three-membered rings
  • Three-membered rings
  • Four-membered rings
  • Five-membered rings with one heteroatom
  • Sulphur containing macrocycles
  • Nitrogen-containing macrocyclic compounds
  • Oxygen-containing macrocyclic compounds

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