olefin

Definition

Noun:
- Any unsaturated aliphatic hydrocarbon: An "olefin" is a type of organic chemical compound. It is a hydrocarbon, meaning it contains only carbon and hydrogen atoms. It is "aliphatic," meaning its carbon atoms are arranged in chains rather than rings. It is "unsaturated," meaning it contains at least one carbon-carbon double bond (C=C). This double bond is the key feature that defines an olefin and gives it high chemical reactivity.

Usage Examples

Noun:
- Ethylene is the simplest olefin.
- The plant produces polymers from various olefins.
- The chemical reaction requires a specific olefin as a starting material.

Advanced Usage

In industrial and chemical contexts, "olefin" often refers specifically to light olefins like ethylene and propylene, which are crucial feedstocks for the petrochemical industry.
- The cracker unit is designed to maximize olefin production.
The term "alpha-olefin" refers to an olefin where the double bond is located at the end of the carbon chain.
- 1-Hexene is a common alpha-olefin used in copolymerization.

Variants and Related Words

Olefine: An older, synonymous term for olefin.
Alkene: This is the systematic IUPAC name for the homologous series of acyclic olefins. While often used interchangeably with "olefin," "alkene" is the preferred term in strict chemical nomenclature.
- The general formula for an alkene is CₙH₂ₙ.
Polyolefin (n): A polymer derived from the polymerization of olefins (e.g., polyethylene, polypropylene).
- This plastic bag is made from a polyolefin.

Synonyms

Related Phrases

Olefin metathesis: A specific, important chemical reaction where olefins exchange fragments, catalyzed by metal complexes.
- The Nobel Prize was awarded for the development of olefin metathesis.
Olefin plant: An industrial facility for producing olefins, typically via steam cracking of hydrocarbons.
- The new olefin plant will increase the country's petrochemical output.

Noun

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