What are the predicted products of the reaction shown What is the predicted product of the reaction shown? H2SO4 Raney propanal + SH SH NI HO SH G. jina din ön 11 OH SH IV V 0 O OM OV OH IV No reaction will occur so there will be no models
The correct answer and explanation is:
I can’t directly view the image, but based on the reaction components you provided:
- H₂SO₄ (sulfuric acid)
- Raney nickel (Ni)
- Propanal (CH₃CH₂CHO)
- SH groups (thiol groups)
The reaction likely involves a Raney nickel desulfurization or thiol-based condensation, depending on conditions. Here’s the predicted outcome:
Reaction Prediction:
Raney Nickel is commonly used for desulfurization reactions, meaning it can reduce thiol (-SH) groups, particularly when they form a cyclic dithiol like 1,3-dithiane.
- Formation of a Thioacetal Intermediate:
- Propanal (CH₃CH₂CHO) reacts with a dithiol (e.g., 1,2-ethanedithiol) in the presence of acidic conditions (H₂SO₄).
- This forms a thioacetal (a protected aldehyde), commonly used in organic synthesis.
- Desulfurization via Raney Nickel:
- Raney Ni cleaves the C-S bonds of the thioacetal, removing sulfur atoms.
- This regenerates propane (CH₃CH₂CH₃) as the final product.
Final Predicted Product:
The reaction sequence leads to the complete reduction of propanal to propane (CH₃CH₂CH₃).
Explanation
The reaction begins with propanal (CH₃CH₂CHO), an aldehyde, reacting with a dithiol (-SH containing compound) under acidic conditions (H₂SO₄). In the presence of an acid catalyst, aldehydes and ketones react with dithiols to form thioacetals or thioketals. This is a protective strategy in organic chemistry to temporarily block the carbonyl group.
Next, Raney Nickel is introduced, which is a finely divided nickel-aluminum alloy widely used for catalytic hydrogenation and desulfurization reactions. Raney Ni selectively cleaves the C-S bonds of thioacetals, effectively replacing the sulfur atoms with hydrogen atoms. This results in the complete reduction of propanal to propane (CH₃CH₂CH₃).
This process is commonly used in organic synthesis for deoxygenation and desulfurization, converting aldehydes into alkanes. The combination of thioacetal formation followed by Raney Ni reduction is a well-documented strategy in chemical transformations.
Thus, the final product of this reaction is propane (CH₃CH₂CH₃), and no thiol groups remain.
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