PPT-Electrophilic

Attack Electrophilic Aromatic Substitution Electrophile substitutes for a hydrogen on the benzene ring Mechanism gt Bromination of Benzene Requires a stronger electrophile than Br 2 Use a strong Lewis acid catalyst FeBr. 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.. Preparation of . Haloalkanes. . by Halogenation. Preparation . Aryl Chlorides . by . Electrophilic. Substitution. Halogen . Exchange. Free radical chlorination or . bromination. of . alkanes. gives a complex 287 . 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. Synthetic design involves two distinct steps: . (1) retrosynthetic analysis and . (2) subsequent translation of the analysis into a "forward direction" synthesis. . In the analysis, the chemist recognizes the functional groups in a molecule and disconnects them proximally by methods corresponding to known and reliable reconnection reactions.. of Alkenes: Addition Reactions. Disparlure: sex attractant of the female gypsy moth.. (A type of . pheromone.. ). 2. I. Hydrogenation of Alkenes. Addition. Reactions. oleic acid. (unsaturated). stearic acid. Heterocyclic. Chemistry. Heterocyclic. Chemistry. Five-. membered. . Heterocycles. Pyrrole. , Furan and . Thiophene. Heterocyclic Chemistry. Five Membered Heterocycles-Introduction. The main reason for the study of pyrrole came from the work on the structure of haem; the blood respiratory pigment, and the chlorophyll; the green photosynthetic pigment of plants.. e. nergies & . t. ransition states. 7.2 Review of acid-base reaction mechanisms. 7.3 Writing reactions as transformations. 7.4 Substitution reactions. 7.5 Addition reactions. 7.6 Elimination reactions. BY. Ronald Mensah. Introduction . Fluorination methods. Fluorination in Medical chemistry. Conclusion . Writing Component. References . Questions. Outline . Introduction . What is fluorine?. Location on the periodic table . 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.. Fall . 2018. Schedule of . day. PPE . and Pre-lab check . – at the door. Quiz. Recitation. Safety. Put bags away. Goggles. Gloves. Lab Coat. Lab part 1. IR . Review. Lab part 2. Due . Dates. . Today. 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 Objective. To know about . electrophilic. substitution reactions. Success criteria. Understand . the mechanism of the . electrophilic. substitution reactions of . benzene. Understand this for . halogenation. Arenium Ion Mechanism . Some Aromatic Electrophilic Substitution Reactions Viz. Nitration, Sulphonation, Halogenation, Friedel- Crafts Reaction. Orientation & Reactivity in Mono Substituted Benzene. 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..