21. This annulation provides an efficient route to form an aromatic ring in one step. 22. Lignin confers the hydrophobic properties reflecting the fact that it is based on aromatic rings . 23. These chemical shifts are influenced by aromatic ring current and may change depending on substituents. 24. In the Buchner ring expansion diazo compounds react with aromatic rings with ring-expansion. 25. Gold catalyses the alkylation of certain aromatic rings and a conversion of furans to phenols. 26. It is a six-membered heterocyclic aromatic ring , one of several isomeric triazines. 27. All have a sulfhydryl group (-SH ) covalently bonded to an aromatic ring . 28. For especially electron-rich aromatic rings , the reaction will proceed without a Lewis acid. 29. This suggests that aromaticity is not a strict requirement for favorable interaction with an aromatic ring . 30. Previously called BKT140, it is a synthetic cyclic 14-residue peptide with an aromatic ring .
