PDF-Aromatic Compounds

Aromatic CompoundsEssential feature benzenelike ringscapsaicinHOCH3ONHO An example CCCCCC CCCCCC Polycyclic Aromatic Compounds Polycyclic Aromatic Compounds naphthaleneanthracenephenanthrenepyreneb. Most common reactions for aromatics involve replacement of ring . hydrogens. by other atoms or groups . (substitution reactions). Mechanism of Electrophilic Aromatic Substitution Reactions. Electrophile. The painkiller morphine is obtained from opium, the dried sap of unripe seeps of the poppy . P. apaver. . somniferum. Amines are relatives of ammonia and are usually classified as primary, secondary or tertiary. (. Benzene. ). 140 pm. 140 pm. 140 pm. 140 pm. 140 pm. 140 pm. All C—C bond distances = 140 pm. Benzene. empirical formula. = CH. 140 pm. 140 pm. 140 pm. 140 pm. 140 pm. 140 pm. . 146 pm. 134 pm. Conjugation and Aromaticity. Which resonance form contributes more? .  . A B C D. A = C > B E. B > A = C. Conjugation and Aromaticity. Do you expect a difference in bond lengths?.  . a. yes b. no. Bitter almonds are the source of the aromatic compound benzaldehyde. Sources of Benzene. Some Facts About Benzene. Reacts mainly by substitution. Friedrich August Kekule’. The Orbital Model for Benzene. Session Objectives. Introduction nitro compounds. Nomenclature. Structure and physical properties. Preparation of nitro compounds. Chemical reactions. Cyanides and isocyanides. . General method of preparation. Leon. María. Elena. Larissa. Vanillin. Information. History of benzene. Ring structure. Functional groups. Hückel’s. rule. Vanillin. History of benzene. The . empirical formula for benzene had been long known, but its highly unsaturated structure was a challenge to determine. . Newehy. Chemistry Department, College of Science, King Saud University. http://fac.ksu.edu.sa/melnewehy. Aromatic . Compounds. The Structure of Benzene Ring. - . Benzene. is . the . parent hydrocarbon of . Bitter almonds are the source of the aromatic compound benzaldehyde. Sources of . Benzene. Benzene. , C. 6. H. 6. , is the . parent hydrocarbon . of the . especially stable . compounds known . as . 1435-1436. 2014-2015. Learning Objectives. . Understand the. . resonance description of structure of benzene. Understand the hybridization in benzene. Understand the relation between the stability of benzene and resonance energy. 240 . Chem. 1. The expressing . aromatic compounds . came to mean . benzene. . and derivatives of benzene. .. . Structure of Benzene: Resonance Description. C. 6. H. 6. It contains a six-membered ring and three additional degrees of unsaturation.. MICHAEL FARADAY (1791-1867). first person to isolate and identify benzene. early benzene uses:. - . decaffeinate . coffee. - antiknock additive . in gasoline. - solvent in chem rxns. now we know benzene is a carcinogen!. 282 Benzene and Its Derivatives What Is the Structure of Benzene? What Is Aromaticity?How Are Benzene Compounds Named, and What Are Their Physical Properties?What Is the Benzylic Position, and How D Dr. Geeta Singh. Assistant Professor. Department of Chemistry. D.D.U. Gorakhpur University, Gorakhpur. Introduction. Key . terms.. General reaction for aromatic electrophilic substitution.. Common reactions of AES..