교과서 질문
Give the structures of the intermediates and products V through Z.
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Ch.11 - Reactions of Alcohols
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
11장, 문제 52
Compound A is an optically active alcohol. Treatment with chromic acid converts A into a ketone, B. In a separate reaction, A is treated with PBr3, converting A into compound C. Compound C is purified, and then it is allowed to react with magnesium in ether to give a Grignard reagent, D. Compound B is added to the resulting solution of the Grignard reagent. After hydrolysis of the initial product (E), this solution is found to contain 3,4-dimethylhexan-3-ol. Propose structures for compounds A, B, C, D, and E.
검증된 단계별 안내1
Step 1: Analyze the given reaction sequence. Compound A is an optically active alcohol, which means it has a chiral center. Treatment with chromic acid oxidizes A to a ketone (Compound B). This suggests that A is a secondary alcohol, as chromic acid typically oxidizes secondary alcohols to ketones.
Step 2: In the second reaction, Compound A reacts with PBr3 to form Compound C. PBr3 replaces the hydroxyl group (-OH) of the alcohol with a bromine atom (-Br), converting the alcohol into an alkyl bromide.
Step 3: Compound C is treated with magnesium in ether to form Compound D, which is a Grignard reagent. Grignard reagents are organomagnesium compounds, typically represented as R-MgBr, where R is the alkyl group from Compound C.
Step 4: Compound B (a ketone) is added to the solution containing the Grignard reagent (Compound D). Grignard reagents react with ketones to form tertiary alcohols after hydrolysis. This reaction involves nucleophilic addition of the Grignard reagent to the carbonyl group of the ketone.
Step 5: After hydrolysis of the intermediate product (Compound E), the final product is identified as 3,4-dimethylhexan-3-ol. This structure provides clues about the alkyl groups involved in the Grignard reaction and the original structure of Compound A. Use retrosynthetic analysis to deduce the structures of A, B, C, D, and E based on the final product.
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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
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주요 개념
질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.
Optical Activity
Optical activity refers to the ability of a chiral compound to rotate the plane of polarized light. This property arises from the presence of asymmetric carbon atoms in the molecule, leading to non-superimposable mirror images (enantiomers). Understanding optical activity is crucial for identifying compound A as an optically active alcohol, which influences its reactivity and the products formed in subsequent reactions.
추천 영상:
08:17
Mutorotation and Optical Activity
Grignard Reagents
Grignard reagents are organomagnesium compounds formed by the reaction of magnesium with an organic halide in an ether solvent. They are highly reactive nucleophiles that can react with electrophiles, such as carbonyl compounds, to form alcohols. In this question, the formation of compound D as a Grignard reagent from compound C is essential for understanding how it interacts with compound B to yield the final product E.
추천 영상:
02:12Carbonation of Grignard Reagents
Oxidation and Reduction Reactions
Oxidation and reduction reactions involve the transfer of electrons between substances, leading to changes in oxidation states. In this context, the conversion of compound A (an alcohol) to compound B (a ketone) using chromic acid represents an oxidation reaction. Recognizing these transformations is vital for proposing the structures of the compounds involved and understanding the overall reaction mechanism.
추천 영상:
00:54Distinguishing between Oxidation and Reduction
관련 실천
교과서 질문
Predict the major products (including stereochemistry) when cis-3-methylcyclohexanol reacts with the following reagents.
(a) PBr3
(b) SOCl2
(c) Lucas reagent
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교과서 질문
Propose mechanisms for the following reactions. In most cases, more products are formed than are shown here. You only need to explain the formation of the products shown, however.
(a)
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교과서 질문
Under acid catalysis, tetrahydrofurfuryl alcohol reacts to give surprisingly good yields of dihydropyran. Propose a mechanism to explain this useful synthesis.
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교과서 질문
Predict the major products (including stereochemistry) when cis-3-methylcyclohexanol reacts with the following reagents.
(d) concentrated HBr
(e) TsCl/pyridine, then NaBr
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교과서 질문
The compound shown below has three different types of OH groups, all with different acidities. Show the structure produced after this compound is treated with different amounts of NaH followed by a methylating reagent. Add a brief explanation.
(a) 1 equivalent of NaH, followed by 1 equivalent of CH3I and heat
(b) 2 equivalents of NaH, followed by 2 equivalents of CH3I and heat
(c) 3 equivalents of NaH, followed by 3 equivalents of CH3I and heat
1093
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