Textbook Question
Would you expect the following nucleophiles to do 1,2- or 1,4-addition?a. b. c.
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Ch. 21 - Conjugated Systems I: Stability and Addition Reactions
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- 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 I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: 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 I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: 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: 9780137566471Not the one you use?Change textbook
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Mullins 1st EditionCh. 21 - Conjugated Systems I: Stability and Addition ReactionsProblem 17
Mullins 1st EditionCh. 21 - Conjugated Systems I: Stability and Addition ReactionsProblem 17Chapter 20, Problem 17
The ψ2 molecular orbital for octa-1,3,5,7-tetraene is shown. Draw ψ3.
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Step 1: Understand the molecular orbital diagram for octa-1,3,5,7-tetraene. The ψ2 orbital shown in the image represents the second molecular orbital, where alternating phases (+ and -) are present across the conjugated π-system.
Step 2: Recall that molecular orbitals are formed by the combination of atomic p orbitals. The ψ3 orbital will have one additional node compared to ψ2, as the number of nodes increases with the molecular orbital index.
Step 3: Identify the pattern of nodes in ψ2. In ψ2, there is one node (a region where the phase changes from + to - or vice versa). For ψ3, there will be two nodes, dividing the conjugated system into three regions of alternating phases.
Step 4: Draw ψ3 by placing two nodes along the conjugated π-system. Ensure that the phases alternate (+ and -) in each region, with the nodes positioned symmetrically along the molecule.
Step 5: Verify the drawing by checking that the number of nodes corresponds to the molecular orbital index (ψ3 should have two nodes) and that the phases alternate correctly across the conjugated system.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Molecular Orbitals
Molecular orbitals (MOs) are formed by the linear combination of atomic orbitals (LCAO) when atoms bond together. They describe the probability distribution of electrons in a molecule and can be classified as bonding, antibonding, or non-bonding. Understanding MOs is crucial for predicting the electronic structure and reactivity of molecules, particularly in conjugated systems like octa-1,3,5,7-tetraene.
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Conjugation
Conjugation refers to the overlap of p-orbitals across adjacent double bonds or lone pairs, allowing for delocalization of π electrons. This delocalization stabilizes the molecule and affects its electronic properties, such as color and reactivity. In octa-1,3,5,7-tetraene, the conjugated system plays a significant role in determining the shape and energy of its molecular orbitals.
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Phase of Molecular Orbitals
The phase of a molecular orbital indicates the sign of the wave function, which can be positive or negative. In the provided diagram, blue represents positive phases, while red represents negative phases. The interaction of these phases during the formation of molecular orbitals determines whether they are bonding or antibonding, influencing the stability and energy levels of the resulting orbitals.
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Related Practice
Textbook Question
The molecular orbital picture of H2 can be represented by the following diagram. Label σ and σ* on the diagram—that is, which is (a) and which is (b)? Which is lower in energy? Why?
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Textbook Question
Using the rules described in Section 21.3, draw the molecular orbital picture of hexa-1,3,5-triene. Label the HOMO and LUMO.
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Textbook Question
Hexa-1,3,5-triene uses six p orbitals, each containing a single electron, to make its three π bonds. How many total molecular orbitals are made by the six p orbitals?
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Textbook Question
Which of the following would you expect to be a more stable molecular orbital? Why?
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Textbook Question
Why is this not a viable representation of the ψ2, molecular orbital of buta-1,3-diene?
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