顺-2-丁烯

概览

Each double-bond carbon has a hydrogen and a methyl group. Restricted rotation around the carbon–carbon double bond keeps the cis and trans arrangements distinct. The two isomers share connectivity, so the difference is stereoisomerism rather than positional isomerism.

Identifiers

化学式

C4H8

官能团

烯烃

摩尔质量

56.11 g/mol

Also known as

(Z)-but-2-ene, cis-2-Butene, cis-Butene, beta-cis-Butylene, (2Z)-but-2-ene, cis-1,2-Dimethylethylene

性质

熔点

-138.89 °C

沸点

3.72 °C

密度

0.616 g/cu cm at 25 °C

水中溶解度

In water, 658 mg/L at 25 °C

Related compounds

• 烯烃

Connected reactions

• Partial hydrogenation: But-2-yne → cis-But-2-ene

  炔烃吸附于催化剂表面，从同一面接受两个氢原子。这种顺式加成生成顺-2-丁烯；活性受抑制的 Lindlar 催化剂有助于限制产物继续还原为丁烷。

参考文献

1. PubChem Compound Summary: cis-But-2-ene (CID 5287573)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: Cis–trans isomerism in alkenesJohn McMurry · OpenStax · 2023

   Supports the qualitative structural interpretation of the recorded molecular structure; no new physical measurement or verified preparative yield is claimed.

3. Hazardous Substances Data Bank (HSDB): cis-But-2-ene — melting pointHazardous Substances Data Bank (HSDB)

   Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/5287573#section=Melting-Point. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Haynes, W.M. (ed.). CRC Handbook of Chemistry and Physics. 95th Edition. CRC Press LLC, Boca Raton: FL 2014-2015, p. 3-78

4. Hazardous Substances Data Bank (HSDB): cis-But-2-ene — boiling pointHazardous Substances Data Bank (HSDB)

   Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/5287573#section=Boiling-Point. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Haynes, W.M. (ed.). CRC Handbook of Chemistry and Physics. 95th Edition. CRC Press LLC, Boca Raton: FL 2014-2015, p. 3-78

5. Hazardous Substances Data Bank (HSDB): cis-But-2-ene — densityHazardous Substances Data Bank (HSDB)

   Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/5287573#section=Density. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Lide, D.R., G.W.A. Milne (eds.). Handbook of Data on Organic Compounds. Volume I. 3rd ed. CRC Press, Inc. Boca Raton ,FL. 1994., p. V2: 1950

6. Hazardous Substances Data Bank (HSDB): cis-But-2-ene — solubilityHazardous Substances Data Bank (HSDB)

   Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/5287573#section=Solubility. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Suzuki T; J Computer-Aided Molecular Design 5: 149-66 (1991)