Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene

Bruice8th EditionOrganic ChemistryISBN: 9780135213711당신이 사용하는 게 아니라요?교과서 변경

Bruice 8th Edition

Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene

문제 66d,e

8장, 문제 66d,e

Are the following pairs of structures resonance contributors or different compounds?
d.
e.

검증된 단계별 안내

Step 1: Analyze the structures in pair (a). Both structures have the same molecular formula and connectivity, but the position of the double bond and the positive charge differ. This indicates that they are resonance contributors, as resonance structures differ only in the arrangement of electrons, not the connectivity of atoms.

Step 2: For pair (a), confirm that the positive charge and double bond can be delocalized across the structure. Resonance contributors are representations of the same molecule showing different electron distributions.

Step 3: Analyze the structures in pair (b). Both structures have the same molecular formula and connectivity, but the position of the double bond differs. This suggests that they could be resonance contributors.

Step 4: For pair (b), confirm that the electron movement (delocalization) between the double bond and the carbonyl group is possible. Resonance contributors typically involve the movement of π-electrons or lone pairs to stabilize the molecule.

Step 5: Conclude that both pairs (a) and (b) are resonance contributors, as they represent the same molecule with different electron arrangements, not different compounds.

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주요 개념

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Resonance Structures

Resonance structures are different ways of drawing the same molecule that illustrate the delocalization of electrons. They are not distinct compounds but rather representations that contribute to the overall hybrid structure of the molecule. The actual structure is a resonance hybrid, which is more stable than any individual resonance form.

Stability of Resonance Contributors

The stability of resonance contributors is determined by factors such as the presence of full octets, charge distribution, and the electronegativity of atoms. More stable resonance forms contribute more significantly to the resonance hybrid. Structures with minimized formal charges and better charge distribution are generally more favorable.

Formal Charge

Formal charge is a theoretical charge assigned to an atom in a molecule, calculated based on the number of valence electrons, the number of bonds, and the number of non-bonding electrons. It helps in evaluating the stability of resonance structures; structures with formal charges closer to zero are typically more stable and preferred in resonance contributors.

Are the following pairs of structures resonance contributors or different compounds? d. e.