📚 Oxidation of the Alkenes | 烯烃的氧化
Alkenes are hydrocarbons that contain at least one carbon-carbon double bond. This double bond consists of a strong sigma (σ) bond and a weaker pi (π) bond. The π bond is an area of high electron density, which makes alkenes much more reactive than alkanes. Oxidation of alkenes is a key topic in Cambridge A-Level Chemistry because it links structure, reactivity and organic analysis. Depending on the oxidising agent and conditions, alkenes can be oxidised to diols, carbonyl compounds, carboxylic acids or even carbon dioxide.
烯烃是含有至少一个碳碳双键的烃类。该双键由一个较强的 σ 键和一个较弱的 π 键组成。π 键区域电子云密度高，因此烯烃比烷烃活泼得多。烯烃的氧化是剑桥 A-Level 化学的重要主题，因为它将结构、反应性和有机分析联系起来。根据氧化剂和条件的不同，烯烃可以被氧化为二醇、羰基化合物、羧酸甚至二氧化碳。
1. Introduction to alkene oxidation | 烯烃氧化简介
Alkenes contain a carbon-carbon double bond made up of a σ bond and a π bond. The π bond is relatively weak and electron-rich, so it is readily attacked by oxidising agents. Oxidation reactions of alkenes can range from mild addition of oxygen atoms to complete cleavage of the carbon skeleton.
烯烃含有碳碳双键，由一个 σ 键和一个 π 键组成。π 键相对较弱且电子云密度高，因此容易被氧化剂进攻。烯烃的氧化反应可以从温和的氧原子加成到碳骨架完全断裂不等。
In organic chemistry, oxidation is often recognised as the gain of oxygen, loss of hydrogen, or loss of electrons. Oxidation of an alkene will increase the oxygen-to-carbon ratio in the molecule.
在有机化学中，氧化通常表现为加氧、失氢或失电子。烯烃的氧化会提高分子中氧与碳的比例。
2. Combustion of alkenes | 烯烃的燃烧
Like alkanes, alkenes burn in excess oxygen to form carbon dioxide and water, releasing a large amount of energy. The general equation for complete combustion of an alkene CₙH₂ₙ is:
与烷烃类似，烯烃在过量氧气中燃烧生成二氧化碳和水，并释放大量能量。烯烃 CₙH₂ₙ 完全燃烧的通式如下：
CₙH₂ₙ + 3n/2 O₂ → nCO₂ + nH₂O
In limited oxygen, incomplete combustion occurs. This produces carbon monoxide (CO) or solid carbon (soot). Alkenes tend to burn with a smokier flame than alkanes because their higher carbon-to-hydrogen ratio makes it harder to achieve complete combustion.
在氧气不足时，烯烃发生不完全燃烧，生成一氧化碳（CO）或固体碳（炭黑）。烯烃燃烧时通常比烷烃更容易冒黑烟，因为其较高的碳氢比使完全燃烧更难实现。
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