Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds

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

Bruice 8th Edition

Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds

문제 24e

10장, 문제 24e

What are the major products obtained when each of the following ethers is heated with one equivalent of HI?
e.

검증된 단계별 안내

Identify the structure of the ether in question. Ethers have the general formula R-O-R', where R and R' are alkyl or aryl groups. Determine the specific groups attached to the oxygen atom in the given ether.

Understand the reaction mechanism: When an ether reacts with HI, the bond between the oxygen and one of the alkyl groups (R or R') is cleaved. This occurs via an SN2 or SN1 mechanism, depending on the nature of the alkyl groups. Primary and secondary alkyl groups typically undergo SN2, while tertiary alkyl groups favor SN1.

Determine which bond will break: The bond between the oxygen and the less sterically hindered alkyl group (or the group that forms a more stable carbocation in the case of SN1) is more likely to break. This results in the formation of an alcohol (R-OH) and an alkyl iodide (R'-I).

Write the products: After the bond cleavage, one product will be an alcohol (R-OH) formed from the group still attached to the oxygen, and the other product will be an alkyl iodide (R'-I) formed from the group that was cleaved.

Verify the stoichiometry: Since one equivalent of HI is used, ensure that only one ether bond is cleaved, resulting in the formation of one molecule of alcohol and one molecule of alkyl iodide as the major products.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Ethers

Ethers are organic compounds characterized by an oxygen atom connected to two alkyl or aryl groups. They are generally stable and non-reactive under normal conditions but can undergo cleavage in the presence of strong acids, such as hydroiodic acid (HI). Understanding the structure and reactivity of ethers is crucial for predicting the products formed during their reaction with HI.

Acid-Catalyzed Cleavage

Acid-catalyzed cleavage of ethers involves the protonation of the ether oxygen, making the ether bond more susceptible to nucleophilic attack. When heated with HI, the ether is cleaved to form an alcohol and an alkyl iodide. This reaction is significant in organic synthesis as it allows for the generation of useful products from relatively stable starting materials.

Reaction Mechanism

The reaction mechanism for ether cleavage by HI typically involves a bimolecular nucleophilic substitution (SN2) pathway. In this mechanism, the iodide ion acts as a nucleophile, attacking the carbon atom bonded to the ether oxygen after the ether is protonated. Understanding this mechanism is essential for predicting the major products and their formation during the reaction.

What are the major products obtained when each of the following ethers is heated with one equivalent of HI? e.