Draw the neutral organic product for the following reaction. Show stereochemistry clearly. Draw the neutral organic…
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Question “Draw the neutral organic product for the following reaction. Show stereochemistry clearly. Draw the neutral organic…”
Draw the neutral organic product for the following reaction.
Show stereochemistry clearly.
Answer
Reduce Alkynes to trans-Alkenes
An alkyne can be described as an unsaturated hydrocarbon that has a triple carbon-carbon bond (
). In the presence of sodium or lithium, the carbon-carbon triple bonds can react to form a trans-alkene with a carbon-carbon (
).
Anti-addition:
Anti-addition can be defined as adding two substitutes to the opposite ends of a triple-bonded to create the anti-addition product.
Reaction of alkyne and Li metal
A trans-alkene of an alkyne is formed by combining it with lithium metal in an aromatic ethylamine solvent. The solvent can also act as a reducing agent and then the ammonium chloride salt is added. This is an example:
Mechanism:
Formation intermediate of radical anion:
Formation and use of vinyl radicals:
Formation and use of vinylic anion
Formation of the trans-alkene
Ans:
Conclusion
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