PPT-Polycyclic Aromatic Compounds

1 Nomenclature of Polycyclic Aromatic Compounds Polycyclic aromatic compounds have two or more benzene rings fused together 2 Naphthalene anthracene and phenanthrene are obtained from coal tar. Benzene is aromatic: a cyclic conjugated compound with 6 . . electrons. Reactions of benzene lead to the retention of the aromatic core. Types of Reactions. Electrophilic. substitution. Diazonium. Dr. . Sheppard. CHEM . 2412. Summer 2015. Klein (2. nd. ed. .) . sections. : 18.1, 18.2, 18.8, 18.3, 18.4, 18.5. Aromatic Compounds. Originally distinguished because of smell. Then noticed trends in reactivity. By Kathleen Barbosa. Forensic Chemistry. Arson Investigations. Components of ignition and combustion reaction . Fuel. Oxidizing Agent. Heat. Uninhibited Chemical Chain Reaction. Identify. . Ignitable. page 1 Aromatic Compounds Historically, benzene and its first derivatives had pleasant aromas, and were called aromatic compounds. Structure of Benzene Kekul 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. Finding a measurable amount of one or more PAH metabolites in the urine does not mean that the levels of one or more PAH metabolites or PAHs cause an adverse health effectBiomonitoring studies on leve 15-5. Molecules containing several fused benzene rings are called . polycyclic benzenoid. or . polycyclic aromatic hydrocarbons. (. PAHs. ).. Common names are used for these systems, since there is no simple naming system for them.. 16-6. Naphthalene is activated toward electrophilic substitution.. Naphthalene undergoes electrophilic substitution rather than addition.. Naphthalene is activated with respect to electrophilic aromatic substitution. Bromination at C1 occurs without a catalyst under mild conditions.. 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. . 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 . 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!. Assistant lect. Nora . Zawar. Assistant lect. . Zeina. Dawood. Assistant . lect. . Zahraa. . Amer. . Simple Solution. Solutions. : are liquid pharmaceutical preparations. Which contain one or more soluble chemical substance dissolved in one or more suitable solvent and produce single-phase system.