교과서 질문
Predict the compound in each pair that will undergo the SN2 reaction faster.
(a)
(b)
2349
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Ch.6 - Alkyl Halides; Nucleophilic Substitution
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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TOC.tableOfContents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
6장, 문제 34a,b
Predict the compound in each pair that will undergo solvolysis (in aqueous ethanol) more rapidly.
(a) (CH3CH2)2CH—Cl or (CH3)3C—Cl
(b) 
검증된 단계별 안내1
Step 1: Understand the concept of solvolysis. Solvolysis is a nucleophilic substitution reaction where the solvent acts as the nucleophile. The rate of solvolysis depends on the stability of the carbocation intermediate formed during the reaction. Tertiary carbocations are more stable than secondary or primary carbocations due to hyperconjugation and inductive effects.
Step 2: Analyze part (a) of the problem. Compare (CH3CH2)2CH—Cl and (CH3)3C—Cl. The first compound has a secondary alkyl chloride, while the second compound has a tertiary alkyl chloride. Since tertiary carbocations are more stable, (CH3)3C—Cl will undergo solvolysis more rapidly.
Step 3: Analyze part (b) of the problem. Compare the two structures provided in the image. For the first pair in part B, the compound with the allylic bromide (Br attached to a carbon adjacent to a double bond) will undergo solvolysis more rapidly due to the resonance stabilization of the allylic carbocation. For the second pair, the compound with the tertiary bromide will undergo solvolysis more rapidly due to the stability of the tertiary carbocation.
Step 4: Consider the second image for part (b). Compare the linear alkyl chloride and the branched alkyl chloride. The branched alkyl chloride forms a secondary carbocation upon solvolysis, which is more stable than the primary carbocation formed by the linear alkyl chloride. Thus, the branched alkyl chloride will undergo solvolysis more rapidly.
Step 5: Summarize the reasoning. The rate of solvolysis is determined by the stability of the carbocation intermediate. Tertiary carbocations are the most stable, followed by secondary carbocations, and then primary carbocations. Additionally, resonance effects, such as those in allylic carbocations, can further stabilize the intermediate and increase the rate of solvolysis.
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주요 개념
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Solvolysis
Solvolysis is a type of nucleophilic substitution reaction where a solvent, typically water or an alcohol, acts as the nucleophile. In organic chemistry, it often involves the breaking of a carbon-halogen bond, leading to the formation of a carbocation intermediate. The rate of solvolysis can be influenced by the stability of the carbocation formed, with more stable carbocations undergoing solvolysis more rapidly.
추천 영상:
08:16
Understanding the properties of SN1.
Carbocation Stability
Carbocation stability is a crucial concept in organic chemistry, as it determines the reactivity of compounds in solvolysis reactions. Carbocations are positively charged carbon species, and their stability increases with the degree of substitution: tertiary (3°) carbocations are more stable than secondary (2°), which are more stable than primary (1°). This stability is due to hyperconjugation and inductive effects from surrounding alkyl groups, which can help stabilize the positive charge.
추천 영상:
05:58Determining Carbocation Stability
Nucleophilicity of Solvents
The nucleophilicity of solvents plays a significant role in solvolysis reactions. In aqueous ethanol, the solvent can act as a nucleophile, attacking the electrophilic carbon in the substrate. The strength of the nucleophile affects the reaction rate; stronger nucleophiles will lead to faster solvolysis. Additionally, the solvent's ability to stabilize the transition state and the carbocation intermediate can also influence the overall reaction kinetics.
추천 영상:
13:04Nucleophilic Addition of Solvents
관련 실천
교과서 질문
Predict the compound in each pair that will undergo solvolysis (in aqueous ethanol) more rapidly.
(c)
(d)
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교과서 질문
Show how each compound might be synthesized by the SN2 displacement of an alkyl halide.
e. H2C=CH—CH2CN
f. H—C≡C—CH2CH2CH3
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교과서 질문
Draw the structures of the following compounds.
a. sec-butyl chloride
b. isobutyl bromide
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Predict the compound in each pair that will undergo the SN2 reaction faster.
(c)
(d)
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Give two syntheses for (CH3)2CH—O—CH2CH3, and explain which synthesis is better.
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