What are the products of the following reactions?
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Step 1: Identify the reactants. The starting material is 2-chloropyridine, which contains a pyridine ring with a chlorine atom attached to the second position. The reagent is phenyl lithium (C₆H₅Li), an organolithium compound that acts as a strong nucleophile and base.

Step 2: Recognize the type of reaction. Phenyl lithium can perform nucleophilic substitution reactions, especially on aromatic systems where the leaving group (Cl) is attached to an electron-deficient ring like pyridine. The nitrogen atom in pyridine is electron-withdrawing, making the carbon bonded to chlorine more susceptible to nucleophilic attack.

Step 3: Predict the mechanism. Phenyl lithium will attack the carbon atom bonded to chlorine in a nucleophilic aromatic substitution (SₙAr) mechanism. The chlorine atom acts as the leaving group, and the phenyl group (C₆H₅) replaces it.

Step 4: Draw the intermediate. After the nucleophilic attack, a negatively charged intermediate is formed, where the phenyl group is attached to the second position of the pyridine ring. This intermediate is stabilized by resonance involving the nitrogen atom in the pyridine ring.

Step 5: Finalize the product. The chlorine atom is removed as chloride (Cl⁻), and the final product is 2-phenylpyridine, where the phenyl group is attached to the second position of the pyridine ring.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Reaction Mechanisms

Understanding reaction mechanisms is crucial in organic chemistry as they describe the step-by-step process by which reactants transform into products. This includes identifying intermediates, transition states, and the movement of electrons. A clear grasp of mechanisms helps predict the products of reactions and the conditions under which they occur.

Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. Recognizing functional groups allows chemists to predict reactivity and the types of products that can be formed during chemical reactions. Common functional groups include alcohols, carboxylic acids, and amines.

Stereochemistry

Stereochemistry involves the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. It is essential for understanding isomerism, where compounds with the same molecular formula can have different structures and properties. Stereochemical considerations can significantly influence the outcome of reactions and the nature of the products formed.

What are the products of the following reactions?e.