Definition

Noun: - The bivalent radical CO: A carbonyl group is a specific functional group in organic chemistry consisting of a carbon atom double-bonded to an oxygen atom (C=O). It is a fundamental structural unit found in many important classes of organic compounds.

Usage

The term "carbonyl group" is used to identify and describe the C=O moiety within a molecule. Its presence dictates the classification and many of the chemical properties of the compound. - It is a core concept in organic chemistry nomenclature and reactivity. - The word "group" is an integral part of this specific chemical term.

Examples

• In a sentence:
  • The reactivity of aldehydes and ketones is primarily due to the carbonyl group.
  • Identifying the carbonyl group is the first step in classifying many organic molecules.
• In a chemical context:
  • Formaldehyde (H₂C=O) contains a carbonyl group.
  • In an amide, the carbonyl group is bonded to a nitrogen atom.

Advanced Usage

• "Carbonyl carbon": Refers specifically to the carbon atom within the carbonyl group.
  • The carbonyl carbon is electrophilic and susceptible to nucleophilic attack.
• "Carbonyl oxygen": Refers specifically to the oxygen atom within the carbonyl group.
  • The carbonyl oxygen is basic and can participate in hydrogen bonding.

Variants and Related Words

• Carbonyl (adjective): Pertaining to or containing a carbonyl group.
  • Ketones are carbonyl compounds.
• Carbonyl (noun): Can sometimes refer informally to a metal complex containing carbon monoxide as a ligand (e.g., nickel carbonyl), though this is distinct from the organic functional group.
• Carbonyl Compound (noun phrase): A broad class of organic compounds that contain a carbonyl group, including aldehydes, ketones, carboxylic acids, esters, and amides.

Synonyms

• C=O group: A symbolic synonym used primarily in structural formulas and informal speech.
• Carbonyl functionality: A more formal synonym emphasizing the group's role in chemical reactions.

Related Phrases and Concepts

• Carbonyl stretching frequency: A characteristic absorption range in infrared (IR) spectroscopy used to identify the carbonyl group.
  • The carbonyl stretching frequency for a ketone is typically around 1715 cm⁻¹.
• Carbonyl addition reaction: A fundamental reaction type where a nucleophile adds to the electrophilic carbon of the carbonyl group.
  • The Grignard reaction is a classic carbonyl addition reaction.

Noun

1. the bivalent radical CO