环己烯

含一个碳碳双键的六元环。

化学式
C6H10
官能团
烯烃
摩尔质量
82.14 g/mol
Also known as
Tetrahydrobenzene, Cyclohex-1-ene, Benzene tetrahydride, 1,2,3,4-Tetrahydrobenzene, Benzenetetrahydride, Hexanaphthylene

概览

The alkene contributes a localized addition site within the ring. Bromination through a halonium intermediate favours anti addition, giving trans-1,2-dibromocyclohexane. The ring and double bond each contribute one degree of unsaturation; neither makes this molecule aromatic.

Identifiers

化学式
C6H10
官能团
烯烃
摩尔质量
82.14 g/mol
Also known as
Tetrahydrobenzene, Cyclohex-1-ene, Benzene tetrahydride, 1,2,3,4-Tetrahydrobenzene, Benzenetetrahydride, Hexanaphthylene
化学标识符
SMILES
C1CCC=CC1
InChI
InChI=1S/C6H10/c1-2-4-6-5-3-1/h1-2H,3-6H2
PubChem CID
8079

性质

熔点
-103.5 °C
沸点
83 °C at 760 mm Hg
相对密度（水 = 1）
Relative density (water = 1): 0.81
水中溶解度
In water, 213 mg/L at 25 °C

Diagnostic tests

溴加成试验

试剂
配制好的溴的己烷稀溶液
条件
参照来源中的对比方法，避开强光进行小规模试验。
Positive observation
溴的颜色迅速消失。
Negative observation
相同条件下的饱和烃对照起初保持原色。
Interpretation
溴被消耗与双键处的加成反应相符。
适用范围
预期环己烯呈阳性。
来源说明
溴褪色可见于多种活泼化合物，产物分析另行列出。
证据
reference experiment

Related compounds

Connected reactions

参考文献

  1. PubChem Compound Summary: Cyclohexene (CID 8079)National Center for Biotechnology Information · PubChem

    Identity, molecular formula, molecular weight and aliases retrieved via PUG REST on 2026-09-08.

  2. OpenStax Organic Chemistry: Halogenation of alkenes: addition of X2John McMurry · OpenStax · 2023

    Supports the qualitative structure and reactivity context; identity and numerical measurements retain their original references.

  3. Hazardous Substances Data Bank (HSDB): Cyclohexene — melting pointHazardous Substances Data Bank (HSDB)

    Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/8079#section=Melting-Point. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. 13th Edition, Whitehouse Station, NJ: Merck and Co., Inc., 2001., p. 475

  4. Hazardous Substances Data Bank (HSDB): Cyclohexene — boiling pointHazardous Substances Data Bank (HSDB)

    Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/8079#section=Boiling-Point. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. 13th Edition, Whitehouse Station, NJ: Merck and Co., Inc., 2001., p. 475

  5. ILO-WHO International Chemical Safety Cards (ICSCs): Cyclohexene — densityILO-WHO International Chemical Safety Cards (ICSCs)

    Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/8079#section=Density. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred.

  6. Hazardous Substances Data Bank (HSDB): Cyclohexene — solubilityHazardous Substances Data Bank (HSDB)

    Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/8079#section=Solubility. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Yalkowsky, S.H., He, Yan., Handbook of Aqueous Solubility Data: An Extensive Compilation of Aqueous Solubility Data for Organic Compounds Extracted from the AQUASOL dATAbASE. CRC Press LLC, Boca Raton, FL. 2003., p. 283

  7. Testing for unsaturation with bromine on a microscaleRoyal Society of Chemistry · RSC Education

    Source-supported qualitative reference observations.