Interpretation: The reason behind greater proportions of elimination products favored at higher reaction temperature should be explained.
Concept introduction: Three principal factors that affect the competition between substitution and elimination: basicity of the nucleophile, steric hindrance in the
Nucleophiles that have large steric bulk such as
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Organic Chemistry: Structure and Function
- The following sequence of steps converts (R)-2-octanol to (S)-2-octanol. Propose structural formulas for intermediates A and B, specify the configuration of each, and account for the inversion of configuration in this sequence.arrow_forwardNonconjugated , -unsaturated ketones, such as 3-cyclohexenone, are in an acid-catalyzed equilibrium with their conjugated , -unsaturated isomers. Propose a mechanism for this isomerization.arrow_forwardThe reaction of (2S)-2-chloro-3-methylpentane with sodium iodide yields two products: (2R)-2-iodo-3-methylpentane and racemic 3-iodo-2-methylpentane. Account for the formation of each of these two products. For each product, you should show how it is formed and what that tells you about the mechanism of that specific reaction.arrow_forward
- Two substitution products result from the reaction between 3-chloro-3-methyl-1- butene with sodium acetate (CH3COO – Na +) in acetic acid under SN1. Identify the products.arrow_forward3-Chloro-2-methylpropene reacts with sodium methoxide in methanol to form 3-methoxy-2-methylpropene. For each of the following changes in the reaction conditions, state whether the reaction rate would increase, decrease, or remain the same. Explain your reasoning. In some cases the identity of the major organic product would be expected to change; in such cases, give the expected major product. (a) the same quantities of reagents are dissolved in half the volume of methanol (b) 3-bromo-2-methylpropene is used in place of 3-chloro-2-methylpropene (c) sodium methanethiolate (CH3SNa) is used in place of of sodium methoxidearrow_forward3-Chloro-2-methylpropene reacts with sodium methoxide in methanol to form 3-methoxy-2-methylpropene. For each of the following changes in the reaction conditions, state whether the reaction rate would increase, decrease, or remain the same. Explain your reasoning. In some cases the identity of the major organic product would be expected to change; in such cases, give the expected major product. (a) dimethyl sulfoxide (DMSO) is used in place of methanol (b) methanol is used by itself without sodium methoxide (c) 1-chloro-2,2,-dimethylpropane is used in place of 3-chloro-2-methylpropenearrow_forward
- Pure (S)-2-bromo-2-fluorobutane reacts with methoxide ion in methanol to give a mixture of (S)-2-fluoro-2-methoxybutane and three fluoroalkenes.(a) Use mechanisms to show which three fluoroalkenes are formedarrow_forwardWrite a mechanism that accounts for the formation of ethyl isopropyl ether as one of the products in the following reaction. CI OEt HCI EtOH Write the mechanism for step one of this reaction. Show lone pairs and formal charges. Only the acidic hydrogen should be drawn out with a covalent bond. Write the mechanism for step two of this reaction (where the product of step one reacts with the solvent, ethanol). Show lone pairs and formal charges. Only the acidic hydrogen should be drawn out with a covalent bond. Write the mechanism for the last step of this reaction (formation of ethyl isopropyl ether). Show lone pairs and formal charges. Only the acidic hydrogen should be drawn out with a covalent bond. CI will act as the base in this reaction.arrow_forwardThe structure below is the cyclic ether (epoxide), butene oxide: (1) CH3CH₂ -CH₂ butene oxide How could this compound be prepared from but-1-ene? Explain why butene oxide is much more reactive than its isomer, tetrahydrofuran, which is also a cyclic ether: H₂C-CH₂ H₂C CH₂ tetrahydrofuran Illustrate how butene oxide reacts with ammonia, showing details of the mechanism leading to the final product, C4H11 NO.arrow_forward
- 3-Chloro-1-butene reacts with sodium ethoxide in ethanol to produce 3-ethoxy-1- butene. The reaction is second order, first order in 3-chloro-1-butene, and first order in sodium ethoxide. In the absence of sodium ethoxide, 3-chloro-1-butene reacts with ethanol to produce both 3-ethoxy-1-butene and 1-ethoxy-2-butene. Explain these results.arrow_forwardAlkylation of benzene with 1-chlorobutane in the presence of AlCl3 gave not only the expected butylbenzene product but also, as a major product, (1-methylpropyl)benzene. Write an equation for the reaction Propose a mechanism to account for the formation of butylbenzene Propose a mechanism to account for the formation of (1-methylpropyl)benzenearrow_forwardThe reaction of 2,2-dimethyl-1-propanol with HBr is very slow and forms 2-bromo-2-methylbutane as the main product Come up with a mechanism to explain these observationsarrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning