Domanda del libro di testo
Identify the following alkynes as terminal (T), internal/symmetrical (IS), or internal/unsymmetrical (IU).
(c)
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Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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TOC.tableOfContents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases/Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes 1: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes 2: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification 1: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification 2: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution 1: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution 2: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems 1: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems 2: Pericyclic Reactions54
- Ch. 23 - Benzene 1: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene 2: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Non è quello che usi tu?Cambia libro di testo
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Mullins 1st EditionCh. 10 - Alkynes: Electrophilic Addition and Redox ReactionsProblema 4
Mullins 1st EditionCh. 10 - Alkynes: Electrophilic Addition and Redox ReactionsProblema 4Capitolo 9, Problema 4
Would amide or acetate most easily deprotonate an alcohol to make the alkoxide anion? Calculate Keq for each possibility.
Guida verificata passo dopo passo1
Identify the two bases in the problem: amide (NH₂⁻) and acetate (CH₃COO⁻). These bases will react with the alcohol (ROH) to form the alkoxide anion (RO⁻) and their respective conjugate acids.
Write the acid-base equilibrium reactions for each case: (1) Amide reacting with alcohol: NH₂⁻ + ROH ⇌ RO⁻ + NH₃, and (2) Acetate reacting with alcohol: CH₃COO⁻ + ROH ⇌ RO⁻ + CH₃COOH.
Determine the pKa values of the acids involved: (1) For the amide reaction, the conjugate acid is NH₃ (pKa ≈ 38), and the alcohol has a typical pKa of ~16-18. (2) For the acetate reaction, the conjugate acid is acetic acid (CH₃COOH, pKa ≈ 4.76), and the alcohol again has a pKa of ~16-18.
Calculate the equilibrium constant (K_eq) for each reaction using the relationship: K_eq = 10^(pKa(conjugate acid of base) - pKa(acid being deprotonated)). For the amide reaction, K_eq = 10^(38 - 16). For the acetate reaction, K_eq = 10^(4.76 - 16).
Compare the K_eq values for the two reactions. The base that produces the larger K_eq will more effectively deprotonate the alcohol, as it drives the equilibrium further toward the formation of the alkoxide anion.
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Acidity and Basicity
Acidity refers to the tendency of a compound to donate protons (H+), while basicity is the ability to accept protons. In organic chemistry, the strength of acids and bases can be compared using pKa values, where lower pKa indicates a stronger acid. Understanding the relative acidity of amides and acetates is crucial for predicting which will more readily deprotonate an alcohol to form an alkoxide anion.
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06:21
Understanding the difference between basicity and nucleophilicity.
Equilibrium Constant (K_eq)
The equilibrium constant (K_eq) quantifies the ratio of the concentrations of products to reactants at equilibrium for a given reaction. It is calculated using the formula K_eq = [products]/[reactants]. In this context, calculating K_eq for the deprotonation of alcohols by amides and acetates will help determine which reaction is more favorable and thus which compound is more effective in forming alkoxide anions.
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02:19The relationship between equilibrium constant and pKa.
Alkoxide Ion Formation
An alkoxide ion is formed when an alcohol loses a proton, resulting in a negatively charged species. This process is significant in organic reactions, particularly in nucleophilic substitutions and eliminations. The stability of the alkoxide ion and the ability of the deprotonating agent (amide or acetate) to stabilize the resulting charge will influence the ease of this deprotonation process.
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Percorso guidato
3:39Metal Ion Catalysis Concept 1
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