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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What are the major organic products from each reaction??
Transcribed Image Text:Below are the reactions depicted in the image, which involve the conversion of alkynes to other compounds through specific reagents and conditions. Each reaction is described with the reactants, conditions, and transformation process.
### Reaction 1:
**Reactants:**
- A terminal alkyne
- Water (H₂O)
**Reagents and Conditions:**
1. **BH₃/THF** (Borane in Tetrahydrofuran)
2. **OH⁻, H₂O₂, H₂O** (Hydroxide ion, Hydrogen peroxide, Water)
**Description:**
This reaction represents the hydroboration-oxidation of an alkyne, leading to the formation of an alcohol. The alkyne first undergoes hydroboration with BH₃ in THF, and then the intermediate is oxidized using a mixture of OH⁻, H₂O₂, and H₂O to yield the alcohol.
### Reaction 2:
**Reactants:**
- A cycloalkene with an alkyne group
- Hydrobromic acid (HBr)
**Reagents and Conditions:**
- No specific conditions mentioned apart from the acid.
**Description:**
This reaction involves the addition of HBr to a cyclic compound containing an alkyne. The reaction typically leads to the addition of hydrogen bromide across the triple bond, resulting in a bromoalkene.
### Reaction 3:
**Reactants:**
- A terminal alkyne
- Water (H₂O)
**Reagents and Conditions:**
1. **DiSiAB** (Diisobutylaluminum hydride)
2. **OH⁻, H₂O₂, H₂O** (Hydroxide ion, Hydrogen peroxide, Water)
**Description:**
This reaction illustrates the conversion of an alkyne to an aldehyde or ketone through hydroboration-oxidation using DiSiAB. The first step involves adding DiSiAB to form a vinylborane, which is subsequently oxidized to produce the carbonyl compound.
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