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Lesson of December 5, 2007

Aromaticity and aromatic compounds. Addition of halogens to alkenes. Addition of halogens to dienes. The hypothetical 1,3,5-cicloesatriene.

Benzene and resonance structures. Hydrogenation of cyclohexene, and the 1.3-cicloesadiene hypothetical 1,3,5-cicloesatriene.

Aromaticity as extra-stabilization. Nomenclature Di-substituted aromatic derivatives. Ortho, meta and para-xylene or dimethylbenzene.

Phenols. Stability of phenols in comparison to the enol. Acidity of phenols. Comparison acid phenol-cyclohexanol. Stabilization of resonance ion fenato. Substituted phenols. Increased acidity of p-nitrophenol compared to phenol. Resonance structures. Picric acid (2,4,6-trinitrophenol).

Exercise of December 5, 2007

Stereochemistry absolute and relative. D-lactic acid as a synonym acid (2 R)-idrossipropanoico.

D-tartaric acid, L-tartaric acid and meso-tartaric acid as synonyms (2S, 3S) (2R, 3R) and (2S, 3R)-diidrossisuccinici. Attribution of the absolute configuration in a Fisher projection.

aromatic compounds. Benzaldehyde, Vanillin, THC; Mescalina [2 - (3,4,5-trimetossifenil)-amminoetano] Anisole, 2,6-dichloro-anisole.

aromatic amines. 4-chloro-5-methyl-2-nitroaniline. Difference in basicity between aromatic amines and aliphatic amines.

Aniline and cyclohexylamine.

General rules to define the aroma of a molecular species. Cyclic structures, sp2 hybridization of carbon and Huckel rule (4n +2) pi electrons of the Greek.

Ciclobutadiene and 1,3-Naphthalene. 1,3,5-Cicloeptatriene. The case of the cation ciclopropenilico. Ion tropilio. Difference in acidity between 1 ,3-cyclopentadiene and cyclopentene.