1) Lets assume that, as a preventative measure, you added 2 drops of the Vitride
ID: 814646 • Letter: 1
Question
1) Lets assume that, as a preventative measure, you added 2 drops of the Vitride solution to your bromobenzene/Mg mixture when forming the Grignard reagent, but that your ethereal solution was completely dry (i.e. no water). That Vitride would reduce the 2-methylpropanal when it is added to the Grignard reagent.
What mass of reduced aldehyde would be formed after the workup of the reaction? HINT: Look carefully at the structure of Vitride.
2) Assuming Vitride reduced the aldehyde faster than the Grignard reagent, and also assuming the reduced aldehyde acted just like your desired product during the isolation of 2-methyl-3-heptanol, what is the mass percent of the reduced aldehyde in your product mixture?
3)Its generally a bad idea to add extra reagents that are capable of reacting to a reaction due to the possibility of multiple products that are inseparable.
Comment on whether or not it is/was worthwhile to add Vitride to a sluggish Grignard reagent formation based on your answer to part 2 above as well as based on how you characterized the product.
Explanation / Answer
2- methyl propanol will be formed as a result of reduction reaction. Vitride contains two H- (hydride) ion attached to Al. Hence 2 moles of 2-methyl propanol will form from 1 mole of 2-methyl propanal.
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2-methyl-3-heptanol is formed from the reduction of 2-methyl-3 heptanone.
mass percent = (2 * mass of 2-methyl-3-heptanol/ mass of 2-methyl-3-heptanone) *100
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Vitride is a very strong reducing agent. When added in excess, it can reduce bromobenzene to benzene. Due to multiple product formation separation will be difficult
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