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(a)
Interpretation:
For the rearrangement reaction of the given compound, the mechanism should be drawn, the type of Sigmatropic rearrangement should be identified and the reason for completion of reaction should be explained.
Concept introduction:
- Sigmatropic rearrangement reaction is a pericyclic reaction of polyenes (π-system), in which one σ-bond is formed and another σ-bond is broken and remaining π-bonds are shifting their positions. Thereby the transition state is cyclic. The mechanism of rearrangement is represented by using curved arrows.
- The Sigmatropic rearrangement reaction is represented by using two numbers in the brackets. The numbers represent the numbers of atoms separating the σ-bond which is breaking and the σ-bond which is forming.
- Three membered rings are highly unstable as compared to seven membered rings because the angle strain is increase with decrease in the bond angle.
(b)
Interpretation:
For the rearrangement reaction of the given compound, the mechanism should be drawn, the type of Sigmatropic rearrangement should be identified and the reason for completion of reaction should be explained.
Concept introduction:
- Sigmatropic rearrangement reaction is a pericyclic reaction of polyenes (π-system), in which one σ-bond is formed and another σ-bond is broken and remaining π-bonds are shifting their positions. Thereby the transition state is cyclic. The mechanism of rearrangement is represented by using curved arrows.
- The Sigmatropic rearrangement reaction is represented by using two numbers in the brackets. The numbers represent the numbers of atoms separating the σ-bond which is breaking and the σ-bond which is forming.
- Three membered rings are highly unstable as compared to seven membered rings because the angle strain is increase with decrease in the bond angle.
(c)
Interpretation:
For the rearrangement reaction of the given compound, the mechanism should be drawn, the type of Sigmatropic rearrangement should be identified and the reason for completion of reaction should be explained.
Concept introduction:
- Sigmatropic rearrangement reaction is a pericyclic reaction of polyenes (π-system), in which one σ-bond is formed and another σ-bond is broken and remaining π-bonds are shifting their positions. Thereby the transition state is cyclic. The mechanism of rearrangement is represented by using curved arrows.
- The Sigmatropic rearrangement reaction is represented by using two numbers in the brackets. The numbers represent the numbers of atoms separating the σ-bond which is breaking and the σ-bond which is forming.
- Three membered rings are highly unstable as compared to seven membered rings because the angle strain is increase with decrease in the bond angle.
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Chapter 16 Solutions
ORGANIC CHEMISTRY-PRINT COMPANION (LL)
- Check all molecules that are acids on the list below. H2CO3 HC2H3O2 C6H5NH2 HNO3 NH3arrow_forwardFrom the given compound, choose the proton that best fits each given description. a CH2 CH 2 Cl b с CH2 F Most shielded: (Choose one) Least shielded: (Choose one) Highest chemical shift: (Choose one) Lowest chemical shift: (Choose one) ×arrow_forwardConsider this molecule: How many H atoms are in this molecule? How many different signals could be found in its 1H NMR spectrum? Note: A multiplet is considered one signal.arrow_forward
- For each of the given mass spectrum data, identify whether the compound contains chlorine, bromine, or neither. Compound m/z of M* peak m/z of M + 2 peak ratio of M+ : M + 2 peak Which element is present? A 122 no M + 2 peak not applicable (Choose one) B 78 80 3:1 (Choose one) C 227 229 1:1 (Choose one)arrow_forwardShow transformation from reactant to product, step by step. *see imagearrow_forwardCheck the box if the molecule contains the listed item. *See imagearrow_forward
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistryChemistryISBN:9781259911156Author:Raymond Chang Dr., Jason Overby ProfessorPublisher:McGraw-Hill EducationPrinciples of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
- Organic ChemistryChemistryISBN:9780078021558Author:Janice Gorzynski Smith Dr.Publisher:McGraw-Hill EducationChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningElementary Principles of Chemical Processes, Bind...ChemistryISBN:9781118431221Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. BullardPublisher:WILEY
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