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Ch.8 - Reactions of Alkenes
Wade - Organic Chemistry 9th Edition
Wade9th EditionOrganic ChemistryISBN: 9780135213728당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Wade 9th EditionCh.8 - Reactions of Alkenes문제 6b,c
8장, 문제 6b,c

Predict the products of the following hydration reactions.
b. 2-phenylpropene + dilute acid
c. 1-phenylcyclohexene + dilute acid

검증된 단계별 안내
1
Step 1: Understand the reaction type. Hydration reactions involve the addition of water (H₂O) across a double bond in the presence of an acid catalyst, typically dilute H₂SO₄ or H₃O⁺. This reaction follows Markovnikov's rule, where the hydrogen atom from water adds to the carbon with more hydrogens, and the hydroxyl group (-OH) adds to the carbon with fewer hydrogens.
Step 2: Analyze the structure of 2-phenylpropene. This molecule contains a double bond between the second and third carbons in the propene chain, with a phenyl group attached to the second carbon. Apply Markovnikov's rule to predict that the -OH group will add to the more substituted carbon (the second carbon), and the hydrogen will add to the less substituted carbon (the third carbon).
Step 3: Draw the product for 2-phenylpropene. After hydration, the double bond is broken, and the molecule forms 2-phenyl-2-propanol. The hydroxyl group (-OH) is attached to the second carbon, and the third carbon gains a hydrogen atom.
Step 4: Analyze the structure of 1-phenylcyclohexene. This molecule contains a double bond in the cyclohexene ring between the first and second carbons, with a phenyl group attached to the first carbon. Apply Markovnikov's rule to predict that the -OH group will add to the more substituted carbon (the second carbon), and the hydrogen will add to the less substituted carbon (the first carbon).
Step 5: Draw the product for 1-phenylcyclohexene. After hydration, the double bond is broken, and the molecule forms 1-phenylcyclohexanol. The hydroxyl group (-OH) is attached to the second carbon in the cyclohexane ring, and the first carbon gains a hydrogen atom.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
6m

주요 개념

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

Hydration Reactions

Hydration reactions involve the addition of water (H2O) to an alkene, resulting in the formation of alcohols. In the presence of an acid catalyst, the double bond of the alkene is protonated, leading to the formation of a more stable carbocation intermediate. This intermediate then reacts with water to yield the final alcohol product. Understanding the mechanism of hydration is crucial for predicting the products of the given reactions.
추천 영상:
09:11
Alkyne Hydration

Markovnikov's Rule

Markovnikov's Rule states that in the addition of HX (where X is a halogen or OH) to an asymmetric alkene, the hydrogen atom will attach to the carbon with the greater number of hydrogen atoms already attached. This principle helps predict the regioselectivity of the product formed during hydration reactions, guiding the placement of the hydroxyl group in the final alcohol product.
추천 영상:
03:54
The 18 and 16 Electron Rule

Carbocation Stability

Carbocation stability is a key factor in determining the outcome of reactions involving alkenes. Carbocations are positively charged intermediates that can vary in stability based on their structure; tertiary carbocations are more stable than secondary, which are more stable than primary. The stability of the carbocation formed during the hydration of alkenes influences the product distribution, as more stable carbocations are favored in the reaction pathway.
추천 영상:
05:58
Determining Carbocation Stability
관련 실천
교과서 질문
Show how you would accomplish the following conversions. a. cis-hex-3-ene to meso-hexane-3,4-diol
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교과서 질문

a. Propose a mechanism for the following reaction.

b. Give the structure of the product that results when this intermediate is reduced by sodium borohydride.

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교과서 질문

Predict the products of the following hydration reactions.

a. 1−methylcyclopentene + dilute acid

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교과서 질문

Propose a mechanism to show how 3,3-dimethylbut-1-ene reacts with dilute aqueous H2SO4 to give 2,3-dimethylbutan-2-ol and a small amount of 2,3-dimethylbut-2-ene.

HINT: When predicting products for electrophilic additions, first draw the structure of the carbocation (or other intermediate) that results from electrophilic attack.

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교과서 질문
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Show how you would accomplish the following synthetic conversions.

(d) 2−methylbutan-2-ol → 2-bromo-3-methylbutane

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