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Unformatted text preview: 318N – Krische, Lecture 13: Tu - 03/3/09, Ch. 22 • The nomenclature of aromatic compounds was discussed. Many trivial names persist in the IUPAC system for different classes of arenas. Know this, as trivial names are used extensively. • We found that a 1,4 relationship of a disubstituted benzene was referred to as para , 1,3 as meta and 1,2 as ortho . • 1 H NMR spectra of disubstituted aromatic compounds is very characteristic. Using 1 H NMR, we can easily distinguish between ortho-, meta-, and para-isomers. We predicted the 1H NMR spectra of “homo-disubstituted” benzenes and disubstituted benzenes for which the substituents are different. • PHENOLS : Today, we began exploring the chemistry of phenols. Phenols are hydroxy-arenes and the parent phenol, i.e. hydroxybenzene, is named “phenol.” Compared to saturated organic alcohols (pKa = 16), phenols are much more acidic (pKa = 10). This is due to resonance stabilization of the anion. Try drawing all the resonance structures of the acidic (pKa = 10)....
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This note was uploaded on 03/31/2009 for the course CH 318M taught by Professor Bocknack during the Spring '08 term at University of Texas.
- Spring '08