Alcohols
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What type of reaction occurs between an alcohol and an acyl chloride?
Alcohols react with acyl chlorides in a condensation reaction to form an ester and HCl. This reaction is typically vigorous and exothermic.
Write the general equation for the reaction of an alcohol (R-OH) with an acyl chloride (R'-COCl).
R-OH + R'-COCl → R'-COOR + HCl. This general equation represents the esterification reaction, where R and R' are alkyl groups.
Name the organic product formed when ethanol reacts with ethanoyl chloride.
The organic product is ethyl ethanoate, which is an ester. It has the formula CH₃COOCH₂CH₃.
Why is the reaction between an alcohol and an acyl chloride preferred over an alcohol and a carboxylic acid for ester synthesis in the lab?
Acyl chlorides are more reactive than carboxylic acids, thus the reaction proceeds more readily and usually gives a higher yield of the ester product under milder conditions, without requiring a catalyst.
Describe the role of the lone pair on the alcohol oxygen in the reaction mechanism with an acyl chloride.
The lone pair on the oxygen atom of the alcohol acts as a nucleophile, attacking the electrophilic carbonyl carbon of the acyl chloride. This initiates the reaction, leading to the formation of a tetrahedral intermediate.
What other product besides the ester is generated when an alcohol reacts with an acyl chloride?
Hydrogen chloride (HCl) gas is also produced. This byproduct can be detected by bubbling the gas into water, where it will produce an acidic solution that turns blue litmus paper red.
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