Definition
1,7-Octadiene is a non‑cyclic hydrocarbon belonging to the class of dienes. Its molecular formula is C₈H₁₂, and it contains two carbon–carbon double bonds located at the first and seventh carbon atoms of an eight‑carbon linear chain.
Overview
The compound can be represented by the structural formula CH₂=CH‑CH₂‑CH₂‑CH₂‑CH₂‑CH=CH₂. The double bonds are isolated (i.e., not conjugated) because they are separated by four sp³‑hybridised methylene groups. 1,7-Octadiene is a colorless liquid under standard conditions and is flammable, as is typical for low‑molecular‑weight alkenes. It may be employed as a monomer or intermediate in organic synthesis, particularly in polymerisation reactions that exploit its terminal double bonds.
Etymology / Origin
The name follows the IUPAC nomenclature for open‑chain hydrocarbons: “octa‑” denotes an eight‑carbon backbone, “‑diene” indicates the presence of two double bonds, and the locants “1,7‑” specify that the double bonds are situated at carbon atoms 1 and 7, respectively. No historical or alternative common names are widely recorded.
Characteristics
| Property | Value / Note |
|---|---|
| Molecular formula | C₈H₁₂ |
| Structural type | Linear, non‑conjugated diene |
| Molar mass | 108.20 g·mol⁻¹ |
| Physical state (25 °C) | Liquid |
| Solubility | Insoluble in water; miscible with many organic solvents (e.g., ether, benzene) |
| Reactivity | Undergoes typical diene reactions such as addition (e.g., hydrogenation, halogenation) and polymerisation (e.g., radical or coordination polymerisation). |
| Boiling point, density, melting point | Accurate information is not confirmed in readily accessible authoritative sources. |
Related Topics
- Alkenes – Hydrocarbons containing at least one carbon–carbon double bond.
- Dienes – Compounds with two double bonds; can be conjugated (e.g., 1,3‑butadiene) or isolated (e.g., 1,7‑octadiene).
- Polymerisation of dienes – Processes that convert dienes into elastomeric polymers such as polybutadiene; 1,7‑octadiene can serve as a monomer in specialized polymer systems.
- IUPAC nomenclature – The systematic method for naming organic chemical substances, from which the term “1,7‑octadiene” is derived.
Note: The foregoing description is based on established chemical principles and publicly available data; where quantitative physical‑property data are lacking, the entry explicitly acknowledges the absence of confirmed values.