Difference Between 1-Butyne and 2-Butyne

Key Difference – 1-Butyne vs 2-Butyne

一切简单aliphatic hydrocarbonsare broadly categorized into three types based on the presence of carbon-carbon single or multiple bonds:烷烃，烯烃, andalkynes。烷烃是saturated hydrocarbonsand contain only single carbon-carbon bonds. The general formula of alkane isC_nH_2n+2。Some common alkanes includemethane, ethane,丙烷和丁烷。Alkenes are the unbranched unsaturated hydrocarbons with at least one carbon-carbon double bond. The general formula of alkene isC_nH_2n。The simplest alkene isethylene。Butene, hexene, propene are some common examples for alkenes. Alkynes are the unsaturated hydrocarbons with at least one carbon-carbon triple bond. The general formula of alkyne isC_nH_2n-2。1-butyne和2-butyne是两个简单的炔烃，在不同地方包含一个碳碳三键。两者都有相同的C的分子公式₄H₆，但有一些差异。1-butyne和2-butyne之间的关键区别在于in 1-butyene, the triple bond is found between first and second carbon, whereas in 2-butyene, it is found between second and third carbon atoms。Because of this difference, these two substances have entirely different characteristic features.

内容

1.Overview and Key Difference
2.What is 1-Butyne
3.What is 2-Butyne
4.——1-Butyne vs 2-Butyne并排比较Tabular Form
5.概括

什么是1纽扣？

1-butyne is called a terminal alkyne due to the presence of terminal triple bond between the first and second carbon atoms of the carbon chain. Because of the presence of this terminal bond, 1-butyne can be distinguished from 2-butyene by two main tests. In the first test, ammoniacal cuprous chloride solution gives a red precipitate with 1-butyene, resulting in copper 1-butynide. In the second test, ammoniacal silver nitrate solution reacts with 1-butyne, resulting in silver 1-butynide, which is a white precipitate. Both these two solutions do not react with 2-butyne.

1-butyne是一个非常易燃colorless gas. It is dense than normal air. The IUPAC name of 1-butyne is but-1-yne.

What is 2-Butyne?

2-butyne is a non-terminal alkyne, which has its triple bond in the middle of the carbon chain, connecting the second and the third carbon atoms. Unlike terminal alkynes, 2-butyne do not react with either ammoniacal cuprous chloride solution or ammoniacal silver nitrate solution to give characteristic precipitates. The terminal alkyl groups of 2-butyne provide electrons to sp-hybridized carbon, thus stabilizing the alkyene while decreasing the heat of hydrogenation. Hence, the heat of hydrogenation is less in 2-butyne than in 1-butyne. 2-butyne is a colorless liquid and emits apetroleum-like odor. It has a low density than water and is not soluble in water. The IUPAC name is but-2-yne.

What is the Difference Between 1-Butyne and 2-Butyne?

1-butynevs 2-Butyne
1-butyneis a terminal alkyne with a triple bond that connects first and second carbon atoms.	2-Butyne is a non-terminal alkyne with a triple bond that connects second and third carbon atoms.
Heat of Hydrogenation
氢化热为292 kJ/mol。	氢化的热为275 kJ/mol。
阶段
1-butyneis a colorless gas.	2-Butyne is a colorless liquid.
Stability
由于末端三键的存在，1丁烷的稳定性不如2丁烷。	2-Butyne is more stable.
With Ammoniacal Cuprous Chloride Solution
1-butynegives a red precipitate of copper 1-butynide.	2-butyne没有这样的沉淀。
使用硝酸银溶液（Tollen的试剂）
1-丁烷给出白色乙酰基的白色沉淀。	2-butyne没有这样的沉淀。
IUPAC Name
IUPAC name is but-1-yne.	IUPAC名称是2-yne。
Common Name
通用名称是乙烯。	Common name is Dimethylacetylene.

概括– 1-Butyne vs 2-Butyne

1-butyne和2个纽扣都是属于炔烃的碳氢化合物。1-butyne是一个末端炔烃，具有连接C1和C2的三键。这是一种无色的气体。2-butyne是一种无色液体，其三键连接C2和C3原子。因此，2个丁烷是一个非末端炔烃。由于1-丁烷和2丁烷之间的差异，这两个碳氢化合物具有完全不同的化学和物理特性。但是，它们的化学公式是相同的，即C₄H₆。

下载1-butyne vs 2-butyne的PDF版本

You can download PDF version of this article and use it for offline purposes as per citation note. Please download PDF version hereDifference Between 1-Butyne and 2-Butyne

参考：

1. Carey, Francis A., and Richard J. Sundberg. Advanced Organic Chemistry Part A: Structure and Mechanisms. Boston, MA, Springer US, 2007.
2.朗，克莱夫。X-KIT FET级12物理学化学。南非，皮尔逊，2008年。
3.“ 1-butyne。”国家生物技术信息中心。美国国家医学图书馆，PubChem化合物数据库，Available here。Accessed 8 Sept. 2017.
4. “2-BUTYNE.” National Center for Biotechnology Information. PubChem Compound Database, U.S. National Library of Medicine,Available here。Accessed 8 Sept. 2017.

Image Courtesy:

1. “Ethylacetylene” By Magmar452 – Own work (CC0) viaCommons Wikimedia
2. “Dimethylacetylene” By Edgar181 – Own work (Public Domain) viaCommons Wikimedia