反-2-丁烯
2-丁烯的 E 立体异构体，两个甲基位于双键两侧。
- 化学式
- C4H8
- 官能团
- 烯烃
- 摩尔质量
- 56.11 g/mol
- Also known as
- (E)-but-2-ene, trans-2-Butene, trans-Butene, 2-BUTENE, (E)-, 2-trans-Butene, beta-trans-Butylene
概览
Its atom connectivity matches cis-but-2-ene, but the arrangement around the double bond differs. E/Z assignment compares priorities separately at each alkene carbon; for this simple example, the methyl groups have higher priority than hydrogen.
Identifiers
- 化学式
- C4H8
- 官能团
- 烯烃
- 摩尔质量
- 56.11 g/mol
- Also known as
- (E)-but-2-ene, trans-2-Butene, trans-Butene, 2-BUTENE, (E)-, 2-trans-Butene, beta-trans-Butylene
化学标识符
- SMILES
- C/C=C/C
- InChI
- InChI=1S/C4H8/c1-3-4-2/h3-4H,1-2H3/b4-3+
- PubChem CID
- 62695
性质
- 熔点
- -105.52 °C
- 沸点
- 0.88 °C
- 密度
- 0.6042 g/cu cm at 20/4 °C
- 水中溶解度
- Solubility in water, 511 mg/L at 25 °C
Related compounds
Connected reactions
- Dissolving metal reduction: But-2-yne → trans-But-2-ene
连续的电子转移和质子化使三键转化为双键。中间体依次变化时有利于形成位阻较小的排列，最终得到反-2-丁烯；这一过程不同于金属表面上的氢原子加成。
参考文献
- PubChem Compound Summary: trans-But-2-ene (CID 62695)National Center for Biotechnology Information · PubChem
Identity, molecular formula, molecular weight and aliases retrieved via PUG REST on 2026-09-08.
- 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.
- Hazardous Substances Data Bank (HSDB): trans-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/62695#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
- Hazardous Substances Data Bank (HSDB): trans-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/62695#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
- Hazardous Substances Data Bank (HSDB): trans-But-2-ene — densityHazardous Substances Data Bank (HSDB)
Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/62695#section=Density. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Larranaga, M.D., Lewis, R.J. Sr., Lewis, R.A.; Hawley's Condensed Chemical Dictionary 16th Edition. John Wiley & Sons, Inc. Hoboken, NJ 2016., p. 217
- Hazardous Substances Data Bank (HSDB): trans-But-2-ene — solubilityHazardous Substances Data Bank (HSDB)
Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/62695#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)