Draw The Structures Of Organic Compounds A And B. Omit All Of The Byproducts.

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Question: Draw the structures of organic compounds A and B. Omit all of t…
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Draw the structures of organic compounds A and B. Omit all of the byproducts.
Mg, ether
OH
1) acetaldehyde 2) H20
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General guidance
Concepts and reason This problem is based on the concept of Grignard reagent reactivity. Grignard reagent is a very good nucleophile in case of carbonyl compounds. It is made up by the reaction of haloalkane with Mg in the presence of ether. It attacks on carbonyl compounds followed by the treatment with water and forms corresponding alcohol.
Fundamentals
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Step-by-step
FIRST STEP | ALL STEPS | ANSWER ONLY
Step 1 of 2 ^
The reaction is given below:
OH
1) acetaldehyde
H2
CH, Mg Br
2) H0
(B)
Explanation Common mistakes Hint for next step
The product contains five carbons in which two carbons came from the acetaldehyde and three carbons came from a nucleophile that is propyl magnesium bromide.
Step 2 of 2
The first reaction of synthesis is given below:
Ha
Mg, ether
CH2 –Br
CH, Mg Br
НАС
(A)
The structures of compounds A and B are as follow:
H3C
CH2 Mg Br
HC
CH2Br
(A)
(B)
Explanation In this synthesis, propyl bromide molecule undergoes a chemical reaction with Mg in the presence of ether in order to form Grignard reagent which on reaction with acetaldehyde followed by the treatment of water forms an alcohol which pentan2-ol.
Answer
The structures of compounds A and B are as follow:
H2
CH, Mg Br
CH2-BrH3C
(B)

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