二、炔烃的物理性质
在正炔烃的同系列中,C2~C4的炔烃是气体,C5~C15的是液体,C15以上的是固体。炔烃的熔点和沸点也随着碳原子数目的增加而增高(表11-5)。 表11-5炔烃的物理常数 名称 | 构造式 | 熔点/℃ | 沸点/℃ | 相对密度(d204) | 乙炔 | HC≡CH | -81.8 | -83.6 | - | 丙炔 | CH3C≡CH | -101.51 | -23.2 | - | 1-丁炔 | CH3CH2C≡CH | -122.5 | 8.1 | - | 2-丁炔 | CH3C≡CCH3 | -32.3 | 27 | 0.691 | 1-戊炔 | CH3(CH2)C≡CH | -90 | 29.3 | 0.695 | 2-戊炔 | CH3CH2C≡CH | -101 | 55.5 | 0.714 | 1-己炔 | CH3(CH2)3C≡CH | -132 | 71 | 0.715 | 2-己炔 | CH3(CH2)2C≡CH | -88 | 84 | 0.730 | 3-己炔 | CH3CH2C≡CCH3 | -51 | 81.8 | 0.724 | 1-庚炔 | CH3(CH2)4C≡CH | -81 | 100 | 0.734 | 2-庚炔 | CH3(CH2)3C≡CCH3 | - | 112 | 0.748 | 3-庚炔 | CH3(CH2)2C≡CCH3 | - | 105 | 0.752 | 1-辛炔 | CH3(CH2)5C≡CH | -80 | 125.2 | 0.746 | 2-辛炔 | CH3(CH2)4C≡CCH3 | -60.2 | 137.2 | 0.759 | 3-辛炔 | CH3(CH2)C≡CCH2CH3 | -105 | 133 | 0.752 | 4-辛炔 | CH3 (CH2) 2C≡C(CH2)2CH3 | -102 | 131 | 0.751 | 1-壬炔 | CH3(CH2)6C≡CH | -65 | 160.7 | 0.760 | 2-壬炔 | CH3(CH2)5C≡CCH3 | - | 155747 | 0.769 | 3-壬炔 | CH3(CH2)4C≡CCH2CH3 | - | 154745 | 0.762 | 4-壬炔 | CH3(CH2)3C≡C(CH2)2CH3 | - | 152752 | 0.757 | 1-癸炔 | CH3(CH2)7C≡CH | -44 | | 0.765 | 3-癸炔 | CH3(CH2)5C≡CCH2CH3 | - | | 0.765 |
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