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How do Grignard reagents react with aldehydes and ketones to produce different types of alcohols?
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organometallic compound
The periodic table of the elements, displaying the group numbers and the s, p, d, and f blocks. Elements in the shaded area are the metals of organometallic chemistry.
Grignard reagents are highly reactive organometallic compounds that function as strong nucleophiles. Their reaction with carbonyl compounds, such as aldehydes and ketones, followed by acidification, is a fundamental method in organic chemistry for synthesizing alcohols and assembling complex carbon skeletons.123
The type of alcohol produced depends on the specific carbonyl starting material:
- Formaldehyde: Reaction with a Grignard reagent yields a primary alcohol. This product contains one additional carbon atom compared to the alkyl halide used to prepare the reagent.13
- Other Aldehydes: Reaction with aldehydes (excluding formaldehyde) produces secondary alcohols.13
- Ketones: Reaction with ketones results in the formation of tertiary alcohols.1
These reactions are typically conducted in inert solvents, such as diethyl ether, because the reagents are sensitive to moisture and oxygen.12