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Ch. 17 - Reactions of Aromatic Compounds
Wade - Organic Chemistry 9th Edition
Wade9th EditionOrganic ChemistryISBN: 9780135213728Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoWade 9th EditionCh. 17 - Reactions of Aromatic CompoundsProblema 58d
Capitolo 17, Problema 58d

Show the products you expect when each compound reacts with NBS with light shining on the reaction.
(d)

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Step 1: Recognize the reaction conditions. NBS (N-Bromosuccinimide) in the presence of light is used for allylic or benzylic bromination. This reaction selectively replaces a hydrogen atom at the allylic or benzylic position with a bromine atom.
Step 2: Identify the benzylic position in the given compound. The structure contains a benzene ring attached to a propyl group. The benzylic position is the carbon atom directly attached to the benzene ring in the propyl chain.
Step 3: Determine the radical intermediate. Under light, the reaction proceeds via a radical mechanism. The benzylic hydrogen is abstracted to form a benzylic radical, which is stabilized due to resonance with the benzene ring.
Step 4: Add bromine to the benzylic radical. The bromine atom from NBS reacts with the benzylic radical to form the brominated product. The bromine is added at the benzylic position.
Step 5: Verify the product structure. The final product will have a bromine atom attached to the benzylic position, replacing one of the hydrogens. The rest of the molecule remains unchanged.

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NBS (N-Bromosuccinimide)

NBS is a reagent commonly used in organic chemistry for bromination reactions, particularly in the presence of light. It generates bromine radicals under photolytic conditions, which can abstract hydrogen atoms from alkenes or alkanes, leading to the formation of brominated products. Understanding how NBS functions is crucial for predicting the products of reactions involving this compound.
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Radical Mechanism

The radical mechanism involves the formation and reaction of free radicals, which are highly reactive species with unpaired electrons. In the context of NBS reactions, light initiates the homolytic cleavage of the N-Br bond, generating bromine radicals that can abstract hydrogen from the substrate. This mechanism is essential for understanding how products are formed in radical bromination reactions.
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Substitution vs. Addition Reactions

In organic chemistry, substitution reactions involve replacing one atom or group in a molecule with another, while addition reactions involve adding atoms or groups to a molecule. When reacting with NBS, the process typically leads to substitution of hydrogen atoms with bromine, particularly at allylic positions. Recognizing the type of reaction occurring helps in predicting the structure of the final products.
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