Zn can also be used in alkene synthesis Zn ACOH Br Br Ph Ph H. Ph H Zn H2C= H2C=C=CH2 CI ELOH allene

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Can someone explain the mechanisms and the theory of what my professor is trying to show for organic chemistry? Much appreciated. thank you!

**Title: Zinc in Alkene Synthesis**

Zinc (Zn) plays a crucial role in the synthesis of alkenes, facilitating the transformation of various precursor molecules into desired alkene products.

**Reaction 1:**

- **Reactants:** 
  - A dibromo compound featuring two bromine (Br) atoms connected to a cyclohexane structure with phenyl (Ph) groups.
- **Reagents:**
  - Zinc (Zn) in the presence of acetic acid (AcOH).
- **Products:** 
  - A cyclohexene with two phenyl (Ph) groups.

This reaction highlights the dehalogenation process where zinc assists in removing halogen atoms (bromine in this case), resulting in the formation of a double bond between carbons, which is essential for the alkene's structure.

**Reaction 2:**

- **Reactants:**
  - A 1,1-dichloroethene compound with two chlorine (Cl) atoms attached to a single carbon.
- **Reagents:**
  - Zinc (Zn) in the presence of ethanol (EtOH).
- **Products:** 
  - Allene (H₂C=C=CH₂), a compound characterized by two consecutive double bonds.

In this reaction, zinc acts to remove halogen atoms from the reactant, facilitating the formation of a linear alkene with distinct cumulative double bonds, known as allene.

**Diagram Overview:**

The visual representation includes structural formulas of the reactants and products, with arrows indicating the transformation facilitated by zinc and corresponding reagents. Each arrow signifies the chemical reaction pathway, demonstrating zinc's role in breaking halogen bonds and promoting alkene formation.
Transcribed Image Text:**Title: Zinc in Alkene Synthesis** Zinc (Zn) plays a crucial role in the synthesis of alkenes, facilitating the transformation of various precursor molecules into desired alkene products. **Reaction 1:** - **Reactants:** - A dibromo compound featuring two bromine (Br) atoms connected to a cyclohexane structure with phenyl (Ph) groups. - **Reagents:** - Zinc (Zn) in the presence of acetic acid (AcOH). - **Products:** - A cyclohexene with two phenyl (Ph) groups. This reaction highlights the dehalogenation process where zinc assists in removing halogen atoms (bromine in this case), resulting in the formation of a double bond between carbons, which is essential for the alkene's structure. **Reaction 2:** - **Reactants:** - A 1,1-dichloroethene compound with two chlorine (Cl) atoms attached to a single carbon. - **Reagents:** - Zinc (Zn) in the presence of ethanol (EtOH). - **Products:** - Allene (H₂C=C=CH₂), a compound characterized by two consecutive double bonds. In this reaction, zinc acts to remove halogen atoms from the reactant, facilitating the formation of a linear alkene with distinct cumulative double bonds, known as allene. **Diagram Overview:** The visual representation includes structural formulas of the reactants and products, with arrows indicating the transformation facilitated by zinc and corresponding reagents. Each arrow signifies the chemical reaction pathway, demonstrating zinc's role in breaking halogen bonds and promoting alkene formation.
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