Naming cyclic Aldehydes
Acetaldehyde
Cyclic aldehydes are aldehydes that contain a ring structure. The common names of cyclic aldehydes are derived from the parent ring and the suffix “-aldehyde”. The naming of cyclic aldehydes follows the same basic rules of nomenclature as linear aldehydes.
To name a cyclic aldehyde, follow these steps:
1. Identify the parent ring: The parent ring is the cyclic structure that contains the aldehyde group.
2. Find the longest continuous carbon chain: Count the number of carbons in the parent ring, starting from the carbon that bears the aldehyde group. This chain is numbered so that the aldehyde group has the lowest possible number.
3. Add the suffix “-aldehyde”: The suffix “-aldehyde” is added to the end of the name to indicate that the compound is an aldehyde.
4. Use the appropriate prefixes: If the ring has only one substituent, use the prefixes “ortho-“, “meta-“, and “para-” to indicate the position of the substituent. If the ring has two or more substituents, use the appropriate prefixes to indicate their positions.
5. Write the name in alphabetical order: When there are two or more substituents, the names are written in alphabetical order using their prefixes as tiebreakers.
Example:
The structure below is a cyclic aldehyde and has a parent ring of six carbons.
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H
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H — C — CH2 — C — CH2 — CHO
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H H H
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The longest continuous carbon chain starts at the carbon bearing the aldehyde group and includes the two adjacent carbons in each direction. The aldehyde group is located at carbon 1.
The correct name for this compound is “cyclohexane-1-carbaldehyde”.
More Answers:
Alkenes: Properties, Industrial Applications, and Biological SignificanceAlkanes: Characteristics, Properties, and Reactions
IUPAC Naming of Methanal: Importance of Following Naming Conventions for Aldehydes