CHEM 213 Lecture Notes - Lecture 9: Hydrogenolysis, List Of Generation Ii Pokémon, Nitro Compound
Document Summary
Chapter 21 - aromaticity: discovery of benzene, defining aromaticity , benzene: c6h6: Discovered in coal distillates as a liquid that formed upon compression. Molecular formula c6h6: you can draw several formulae: most clearly a tri-alkene but: Resistant to bromination, hydrogenation, no reaction with hbr or h2so4. When reaction with br2 occurs, it"s not the dibromo-cpd indicating not a standard olefin. The overall lack of reactivity compared to a standard set of alkenes is attributed to the property of aromaticity. Cooh, reduction by hydrogenolysis, and halogenations by free radical methods. You must include any lone pairs which can go sp2 and therefore delocalize into the pi-system: systems that are 4n electrons: anti-aromatic . Examples of non-aromatic: examples that reflect these rules, non-aromatic and/or antiaromatic. Electronically these are no different from benzene except that we"ve replaced a ch group with an n. 6-membered rings are pyridine and pyrimidines shown below respectively.
