**Exercise 3: Predict the major organic product(s) of the following reactions.**1. **Reaction Scheme:** - **Reactant:** Phenylacetylene (a benzene ring attached to a terminal alkyne) - **Conditions:** Catalytic HAuCl₄, H₂SO₄ followed by aqueous MeOH and reflux 2. **Reaction Scheme:** - **Reactant:** Methoxyphenylacetylene (a benzene ring with a methoxy group and a terminal alkyne) - **Conditions:** Catalytic HAuCl₄, H₂SO₄ followed by aqueous MeOH and reflux3. **Reaction Scheme:** - **Reactant:** Diallylbenzene (a benzene ring attached to two propene groups) - **Conditions:** Catalytic HAuCl₄, H₂SO₄ followed by aqueous MeOH and reflux---**Explanation:**Each reaction involves a substrate containing an alkyne or alkene group, treated with a catalyst (HAuCl₄) and sulfuric acid in methanol under reflux conditions. The purpose is typically to predict the major organic product(s) after the reaction.In reactions involving alkynes or alkenes under acidic conditions with gold catalysts, the mechanism often involves electrophilic addition, potentially leading to processes like hydroalkoxylation, hydration, or etherification, resulting in different major products depending on the substituents and specific conditions.

The terminal alkynes is converted into ketones in presence of cat. HAuCl4,H2SO4 and aq. MeOH reflux. These reactions is an example of gold catalyzed hydration reaction.The given reactions is shown below:

Answered: 3) Predict the major organic product(s)…

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3) Predict the major organic product(s) of the following reactions. cat. HAUCI4, H2SO4 aq. MeOH reflux H3CO cat. HAUCI4, H2SO4 aq. MeOH reflux cat. HAUCI4, H2SO4 aq. MeOH reflux

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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Concept explainers

Reactions of Ethers

Ethers (R-O-R’) are compounds formed by replacing hydrogen atoms of an alcohol (R-OH compound) or a phenol (C6H5OH) by an aryl/ acyl group (functional group after removing single hydrogen from an aromatic ring). In this section, reaction, preparation and behavior of ethers are discussed in the context of organic chemistry.

Epoxides

Epoxides are a special class of cyclic ethers which are an important functional group in organic chemistry and generate reactive centers due to their unusual high reactivity. Due to their high reactivity, epoxides are considered to be toxic and mutagenic.

Williamson Ether Synthesis

An organic reaction in which an organohalide and a deprotonated alcohol forms ether is known as Williamson ether synthesis. Alexander Williamson developed the Williamson ether synthesis in 1850. The formation of ether in this synthesis is an SN2 reaction.

Question

**Exercise 3: Predict the major organic product(s) of the following reactions.**

1. **Reaction Scheme:**

- **Reactant:** Phenylacetylene (a benzene ring attached to a terminal alkyne)
- **Conditions:** Catalytic HAuCl₄, H₂SO₄ followed by aqueous MeOH and reflux

2. **Reaction Scheme:**

- **Reactant:** Methoxyphenylacetylene (a benzene ring with a methoxy group and a terminal alkyne)
- **Conditions:** Catalytic HAuCl₄, H₂SO₄ followed by aqueous MeOH and reflux

3. **Reaction Scheme:**

- **Reactant:** Diallylbenzene (a benzene ring attached to two propene groups)
- **Conditions:** Catalytic HAuCl₄, H₂SO₄ followed by aqueous MeOH and reflux

---

**Explanation:**

Each reaction involves a substrate containing an alkyne or alkene group, treated with a catalyst (HAuCl₄) and sulfuric acid in methanol under reflux conditions. The purpose is typically to predict the major organic product(s) after the reaction.

In reactions involving alkynes or alkenes under acidic conditions with gold catalysts, the mechanism often involves electrophilic addition, potentially leading to processes like hydroalkoxylation, hydration, or etherification, resulting in different major products depending on the substituents and specific conditions.

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