Definition

1. Noun:
   • A univalent radical derived from an alkane: An "alkyl group" is a functional group in organic chemistry consisting of carbon and hydrogen atoms arranged in a chain, with the general formula CₙH₂ₙ₊₁. It is formed by removing one hydrogen atom from an alkane molecule, making it a substituent that can bond to other atoms or groups.

Usage Examples

• Noun:
  • Methane (CH₄) loses a hydrogen atom to become a methyl group (CH₃-), the simplest alkyl group.
  • In the molecule ethylbenzene, an ethyl group (C₂H₅-) is attached to a benzene ring.
  • The properties of an alcohol are influenced by the size and structure of its alkyl group.

Advanced Usage

• "Free alkyl group": Refers to an alkyl group that is not bonded to another atom in a stable molecule, often a reactive intermediate.
  • In certain reactions, a free alkyl group can be generated as a short-lived radical.
• "Alkyl group transfer": Describes a chemical reaction where an alkyl group is moved from one molecule to another.
  • The enzyme catalyzes an alkyl group transfer from S-adenosylmethionine to the target DNA.

Variants and Related Words

• Alkyl (adj): Pertaining to or characteristic of an alkyl group.
  • Alkyl halides are a class of compounds where a halogen is bonded to an alkyl group.
• Alkane (n): The parent saturated hydrocarbon from which an alkyl group is derived.
  • Alkanes like propane are the source of alkyl groups such as propyl.

Synonyms

• Alkyl radical: A synonymous term, emphasizing its nature as a radical or fragment.
• Aliphatic group: A broader term that includes alkyl groups but also encompasses unsaturated aliphatic chains.

Related Phrases

• "Branched alkyl group": An alkyl group where the carbon chain is not linear but has side branches.
  • Isobutane contains a branched alkyl group.
• "Linear alkyl group": An alkyl group with a straight-chain structure.
  • The detergent was made from a linear alkyl group to improve biodegradability.

Notes

• Alkyl groups are fundamental building blocks in organic chemistry and are key components in countless compounds, from fuels and plastics to pharmaceuticals. Their structure (length, branching) critically determines the physical and chemical properties of the molecules they are part of.

Noun

1. any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons