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Electrophilic aromatic substitution

Organic Chemistry Lecture 19a

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Chapter 19 ? 2010, Prentice Hall Organic Chemistry, 7th Edition L. G. Wade, Jr. Amines Chapter 19 * Biologically Active Amines The alkaloids are an important group of biologically active amines, mostly synthesized by plants to protect them from being eaten by insects and other animals. Many drugs of addiction are classified as alkaloids. Chapter 19 * Biological Activity of Amines Dopamine is a neurotransmitter. Epinephrine is a bioregulator. Niacin, Vitamin B6, is an amine. Alkaloids: nicotine, morphine, cocaine Amino acids Chapter 19 Chapter 19 * Classes of Amines Primary (1?): Has one alkyl group bonded to the nitrogen (RNH2). Secondary (2?): Has two alkyl groups bonded to the nitrogen (R2NH). Tertiary (3?): Has three alkyl groups bonded to the nitrogen (R3N).

Organic Chemistry Lecture 17

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Chapter 8 ? 2010, Prentice Hall Organic Chemistry, 7th Edition L. G. Wade, Jr. Reactions of Alkenes Chapter 8 * Bonding in Alkenes Electrons in pi bond are loosely held. The double bond acts as a nucleophile attacking electrophilic species. Carbocations are intermediates in the reactions. These reactions are called electrophilic additions. Chapter 8 Chapter 8 * Electrophilic Addition Step 1: Pi electrons attack the electrophile. Step 2: Nucleophile attacks the carbocation. Chapter 8 Chapter 8 * Types of Additions Chapter 8 Chapter 8 * Addition of HX to Alkenes Step 1 is the protonation of the double bond. The protonation step forms the most stable carbocation possible. In step 2, the nucleophile attacks the carbocation, forming an alkyl halide.
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