Ch. 12 - Radicals

Bruice8th EditionOrganic ChemistryISBN: 9780135213711당신이 사용하는 게 아니라요?교과서 변경

Bruice 8th Edition

Ch. 12 - Radicals

문제 43c

12장, 문제 43c

Using the given starting material and any necessary organic or inorganic reagents, indicate how the desired compounds could be synthesized:
c.

검증된 단계별 안내

Step 1: Analyze the starting material and the desired product. The starting material is a secondary alcohol, and the desired product is a secondary alkyl bromide. This suggests that the reaction involves the conversion of an alcohol to an alkyl halide.

Step 2: Select an appropriate reagent for converting alcohols to alkyl halides. A common reagent for this transformation is phosphorus tribromide (PBr₃), which reacts with alcohols to produce alkyl bromides.

Step 3: Write the reaction mechanism. The alcohol reacts with PBr₃, where the hydroxyl group (-OH) is replaced by a bromine atom (Br). This occurs via nucleophilic substitution (SN2 mechanism) for secondary alcohols.

Step 4: Ensure reaction conditions are suitable. The reaction with PBr₃ typically occurs under mild conditions and does not require heating. It is important to use anhydrous conditions to prevent side reactions.

Step 5: Verify the stereochemistry of the product. Since the reaction proceeds via an SN2 mechanism, inversion of configuration at the carbon center may occur. Ensure the product matches the desired stereochemistry.

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주요 개념

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Radical Reactions

Radical reactions involve the formation and reaction of free radicals, which are highly reactive species with unpaired electrons. In organic synthesis, these reactions can be initiated by heat or light, leading to the substitution of atoms in a molecule. For example, in the synthesis of brominated compounds, a radical initiator can abstract a hydrogen atom from an alcohol, generating a radical that can then react with bromine.

Bromination of Alcohols

Bromination of alcohols typically involves converting the alcohol into a more reactive species, such as a bromide. This can be achieved through radical mechanisms where the hydroxyl group is replaced by a bromine atom. The process often requires the presence of a brominating agent, such as N-bromosuccinimide (NBS), which facilitates the substitution reaction under radical conditions.

Mechanism of Substitution Reactions

Substitution reactions can occur via different mechanisms, including radical, nucleophilic, and electrophilic pathways. In the context of radical bromination, the mechanism typically involves initiation, propagation, and termination steps. Understanding these steps is crucial for predicting the outcome of the reaction, including regioselectivity and stereochemistry, which are important for synthesizing the desired brominated compound.

관련 실천

교과서 질문

Using the given starting material and any necessary organic or inorganic reagents, indicate how the desired compounds could be synthesized:

1275

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교과서 질문

At 600 °C, the ratio of the relative rates of formation of a tertiary, a secondary, and a primary radical by a chlorine radical is 2.6 : 2.1 : 1. Explain the change in the degree of regioselectivity compared to what was found in Problem 44.

983

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교과서 질문

Given that ∆H° for the reaction is -42 kcal/mol and the bond dissociation enthalpies for the C−H, C−Cl, and O−H bonds are 101, 85, and 105 kcal/mol respectively, calculate the bond dissociation enthalpy of the O−Cl bond.

1243

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교과서 질문

Draw the products of the following reactions, including all stereoisomers:

532

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교과서 질문

A chemist wanted to determine experimentally the relative ease of removing a hydrogen atom from a tertiary, a secondary, and a primary carbon by a chlorine radical. He allowed 2-methylbutane to undergo chlorination at 300 °C and obtained as products 36% 1-chloro-2-methylbutane, 18% 2-chloro-2-methylbutane, 28% 2-chloro-3-methylbutane, and 18% 1-chloro-3-methylbutane. What values did he obtain for the relative ease of removing a hydrogen atom from tertiary, secondary, and primary hydrogen carbons by a chlorine radical under the conditions of his experiment?

1323

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교과서 질문

Propose a mechanism for the following reaction:

825

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Using the given starting material and any necessary organic or inorganic reagents, indicate how the desired compounds could be synthesized: c.

비슷한 문제에 대한 검증된 영상 답변:

주요 개념

Radical Reactions

Bromination of Alcohols

Mechanism of Substitution Reactions

Using the given starting material and any necessary organic or inorganic reagents, indicate how the desired compounds could be synthesized:
c.