41. CitB oxidizes the C-atom of a methyl group bound to the aromatic ring and produces an alcohol. 42. The aromatic ring of the bisphenol can be substituted with an allylic group for improved toughness of the material. 43. The naphthalene analogs allow for further numeric substitutions, including eight position " differing aromatic rings are possible. 44. Saturated cyclic compounds contain single bonds only, whereas aromatic rings have an alternating ( or conjugated ) double bond. 45. Phenols can have two or more hydroxy groups bonded to the aromatic ring ( s ) in the same molecule. 46. Both molecular weight and aromatic rings add to polymers'thermal stability, increasing the creep resistance of a polymer. 47. Typical pharmacophore features include hydrophobic centroids, aromatic rings , hydrogen bond acceptors or donors, cations, and anions. 48. They have two aromatic rings separated by 1-3 atoms ( often a stilbene-type of arrangement ). 49. This forms a bicyclic intermediate which normally then extrudes a molecule of nitrogen gas to form an aromatic ring again. 50. The negative charge is delocalised into the aromatic ring , making it far more nucleophilic and increases its ortho selectivity.
