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Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions
Bruice - Organic Chemistry 8th Edition
Bruice8th EditionOrganic ChemistryISBN: 9780135213711Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBruice 8th EditionCh. 22 - Catalysis in Organic Reactions and in Enzymatic ReactionsProblema 9
Capitolo 22, Problema 9

The relative rate of reaction for the cis alkene (E) is given in Table 22.2. What do you expect the relative rate of reaction for the trans alkene to be?

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Understand the context: The problem involves comparing the relative rates of reaction for cis and trans alkenes. Cis and trans isomers differ in their spatial arrangement, which can influence their reactivity due to steric and electronic effects.
Review the data in Table 22.2: Locate the relative rate of reaction for the cis alkene (E) in the table. This value will serve as a reference point for comparison with the trans alkene.
Consider steric effects: Cis alkenes typically have substituents on the same side of the double bond, leading to greater steric hindrance. Trans alkenes, with substituents on opposite sides, generally experience less steric hindrance, which can affect their reactivity.
Analyze electronic effects: The spatial arrangement of substituents in cis and trans alkenes can also influence the stability of the transition state during the reaction. Trans alkenes often have a more favorable transition state due to reduced steric strain.
Predict the relative rate: Based on the steric and electronic considerations, hypothesize whether the trans alkene will react faster or slower than the cis alkene. Use the relative rate of the cis alkene as a benchmark to estimate the relative rate of the trans alkene.

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Cis and Trans Isomerism

Cis and trans isomerism refers to the geometric isomers of alkenes, where 'cis' indicates that substituents are on the same side of the double bond, while 'trans' indicates they are on opposite sides. This spatial arrangement affects the physical and chemical properties of the compounds, including their reactivity.
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Is the following cyclohexane cis or trans?

Reaction Mechanisms of Alkenes

The reaction mechanisms of alkenes often involve electrophilic addition, where the double bond acts as a nucleophile. The stability of the intermediate carbocation formed during the reaction can influence the rate of reaction, with more substituted alkenes typically reacting faster due to greater stability.
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Alkene Metathesis Concept 5

Steric Hindrance

Steric hindrance refers to the repulsion between bulky groups in a molecule that can impede reactions. In the case of alkenes, the spatial arrangement of substituents can affect how easily reactants approach the double bond, influencing the overall rate of reaction for cis versus trans isomers.
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Understanding steric effects.
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