2 3 Limonene

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
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how is it a chiral center? if the four groups have two carbons?

### Limonene Structure

The diagram illustrates the chemical structure of limonene, a cyclic monoterpene commonly found in the peels of citrus fruits. It features a six-carbon ring, with a double bond between two of the carbon atoms on the ring. The structure also includes an isopropenyl group attached to the ring.

#### Key Features:

1. **Carbon Ring:** A six-membered carbon ring forms the core structure, characteristic of cyclic compounds.

2. **Double Bonds:** 
   - One double bond is located within the ring.
   - An additional double bond is present in the isopropenyl group attached to the carbon ring.

3. **Substituents:**
   - The isopropenyl group features a carbon atom doubly bonded to a carbon atom in the ring, extending to include another double bond to a carbon in the substituent itself.

4. **Numbering System:** 
   - The carbon atoms are numbered as 1, 2, and 3 to indicate specific positions around the ring and substituent group.

5. **Chirality:** 
   - The dashed lines and “R” denote the chiral center, indicating stereochemistry at that position.

Limonene is known for its strong citrus scent and is widely used in cleaning products, food flavorings, and fragrances due to its pleasant aroma and solvent properties.
Transcribed Image Text:### Limonene Structure The diagram illustrates the chemical structure of limonene, a cyclic monoterpene commonly found in the peels of citrus fruits. It features a six-carbon ring, with a double bond between two of the carbon atoms on the ring. The structure also includes an isopropenyl group attached to the ring. #### Key Features: 1. **Carbon Ring:** A six-membered carbon ring forms the core structure, characteristic of cyclic compounds. 2. **Double Bonds:** - One double bond is located within the ring. - An additional double bond is present in the isopropenyl group attached to the carbon ring. 3. **Substituents:** - The isopropenyl group features a carbon atom doubly bonded to a carbon atom in the ring, extending to include another double bond to a carbon in the substituent itself. 4. **Numbering System:** - The carbon atoms are numbered as 1, 2, and 3 to indicate specific positions around the ring and substituent group. 5. **Chirality:** - The dashed lines and “R” denote the chiral center, indicating stereochemistry at that position. Limonene is known for its strong citrus scent and is widely used in cleaning products, food flavorings, and fragrances due to its pleasant aroma and solvent properties.
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