Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:**Title: Drawing Resonance Structures for Cycloheptatrienyl Anion**
In this educational guide, we will explore how to draw three additional resonance structures for a cycloheptatrienyl anion, as depicted in the image.
**Initial Structure:**
The first structure shows a cycloheptatrienyl anion (tropylium anion) with a methyl group attached. There is a negative charge on one of the carbon atoms in the ring, indicated by the negative sign. It's important to note the lone pair of electrons and the electron pushing represented by the curved arrow on the carbon atom in the ring, beside the double bond.
**Resonance Structures:**
1. **Second Structure:**
- The second structure shows the first resonance form.
- Here, the negative charge and lone pair have shifted to the adjacent carbon atom, resulting in the movement of the double bonds around the ring.
- The arrow indicates the direction of electron movement.
2. **Third Structure:**
- This structure is another resonance form.
- The negative charge continues to move along the ring, facilitating the delocalization of electrons across different carbon atoms.
- Double bonds have shifted positions to accommodate electron flow.
3. **Fourth Structure:**
- The final resonance form depicted continues the trend.
- All electrons involved in the delocalization process are evenly distributed across the ring, providing stability to the molecule.
- The presence of multiple resonance structures highlights the anion's ability to stabilize through electron delocalization.
These diagrams visually represent the movement of electrons within a cycloheptatrienyl anion, demonstrating how resonance structures, through electron delocalization, help distribute charge and confer extra stability to this aromatic system.
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