PPT-Polycyclic Aromatic Hydrocarbons

155 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. 31g ID Aceanthrylene Abbr ACEA CAS 202 03 09 MW 20226g ID Acenaphthene Abbr AN CAS 83 32 MW 15421 ID Acenaphthylene Abbr ANL CAS 208 96 MW 15220 ID Acepyrene 23 Abbr ACEP CAS 25732 74 MW 22829 ID Anthanthrene Abbr AA CAS 191 26 MW 27634 ID PAHs are found naturally in the environment but they can also be manmade In their purest form PAHs are solid and range in appearance from colorless to white or pale yellow green PAHs are created when products like coal oil gas and garbage are burned 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. 15-8. Benzene undergoes substitution reactions with electrophiles.. Electrophiles attack benzene by substituting for a hydrogen atom, not addition to the ring.. Under the conditions of this type of reaction, ordinary non-aromatic conjugated polyenes would polymerize rapidly.. 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. Most common reactions for aromatics involve replacement of ring . hydrogens. by other atoms or groups . (substitution reactions). Mechanism of Electrophilic Aromatic Substitution Reactions. Electrophile. , and polycyclic aromatic hydrocarbons (PAHs) are substances that are on the Biological Nutrients Banned List but not the Technical Nutrients Banned List. While these substances can be used in some ma Orbitals. Natural gas?. Fig. 11.1. Aliphatic Hydrocarbon Structure Comparison. Bonding and Geometry. of Two-Carbon Molecules . 11.1 Structure and Physical. . Properties. Dr. . Shatha. I . Alaqeel. 108 . Chem. Learning Objectives. By the end of chapter four the students will:. Understand the resonance description of structure of benzene. Understand the hybridization in benzene. 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 . 22.1 Hydrocarbons. Organic Chemistry. includes almost all carbon compounds. Not limited to compounds found in living cells. Hydrocarbon: organic compound made of only hydrogen and carbon atoms. hydrocarbons. 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. 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!. ��BAP AND DRINKING WATER��2 You should also avoid contact with asphalt/seal coat produced from coal tar.BaPand other PAHs can be removed from drinking water with granular a