水解
氯代烷 → 醇：查看反应物、产物、反应条件与来源依据，探索相关转化和合成路径。
- 试剂
- NaOH 或 KOH 的水溶液
- 条件
- 温热
- 反应类别
- 亲核取代
- 方程式
- R-Cl + OH- -> R-OH + Cl-
概览
氢氧根可取代 C-Cl 中的氯，形成醇。
转化
- 方程式
- R-Cl + OH- -> R-OH + Cl-
- 试剂
- NaOH 或 KOH 的水溶液
- 反应环境
- 温热
- 反应类别
- 亲核取代
- 机理
- 亲核取代
- Evidence level
- 教材核心内容
参考步骤
Comparative hydrolysis and chloride release
1-chlorobutane: water substitution with silver-chloride detection
物料与用量
- 1-chlorobutane
- Ethanol, water and silver nitrate at the cited comparison conditions
仪器装置
- Matched tubes
- Water bath and timer
实验步骤
- Record the time to a white precipitate under the same conditions as the other two primary halogenoalkanes.
后处理与分离
- The alcohol remains in a mixture; no purified yield is determined.
关键控制条件
- The expected relative timing is slowest. Precipitation detects released chloride, not the alcohol directly.
- Water is the nucleophile here; the preparative aqueous-hydroxide route uses different conditions.
实验技术
控温加热
应按来源给出的温度控温，选用适合溶剂、用量和目标温度的热源及容器。“加热”本身并不构成完整操作步骤。
装置设置
- 根据来源给出的温度选择浴液：水浴温度上限接近 100 °C；更高温度需使用合适的油浴、沙浴或指定加热装置。
- 固定好容器，合理放置温度探头，使其稳定测量反应体系或浴液温度，并避免接触加热器。
- 除非来源方法明确要求额定耐压设备，否则应保持装置可排气；不得将普通玻璃仪器临时改成密闭反应器。
- 逐步将混合物升至规定温度，达到工作温度后再开始计时。
操作检查
- 易燃有机溶剂应使用电加热，避免明火。
- 防暴沸颗粒应在加热前加入，不得加入热液体中。
- 若来源仅写“加热”，不得自行推定温度、时间或用量；应先取得针对具体底物的操作方法。
Controlled comparison of reaction times
Compare a visible change while keeping variables other than the one under study consistent.
装置设置
- Use equal concentrations, volumes and mixing methods, and equilibrate samples at the same temperature.
- Define the visible endpoint before starting and record repeated measurements.
操作检查
- Precipitation time includes mixing and detection thresholds; its inverse is only a relative-rate proxy under matched conditions.
- Do not compare different carbon skeletons when isolating the effect of halogen identity.
底物范围
- 适用范围
- Hydrolysis of chloroalkanes with aqueous hydroxide.
- 来源说明
- Aqueous hydroxide favours substitution; ethanolic hydroxide favours elimination. The mechanism diagram uses a primary chloroalkane exemplar and should not be read as a universal pathway for tertiary chloroalkanes, which can follow different substitution mechanisms.
相关反应
- Chlorination: Alcohols → Chloroalkanes
醇可转化为氯代烷，为后续取代反应引入更易离去的基团。
- Chlorination with thionyl chloride: Alcohols → Chloroalkanes
氯化亚砜将醇转化为氯代烷，同时生成二氧化硫和氯化氢。
- Bromination: Alcohols → Bromoalkanes
在溴化物和酸的作用下，醇转化为溴代烷。
- Iodination: Alcohols → Iodoalkanes
在碘和红磷的作用下，醇转化为碘代烷。
- Hydrochlorination: Alkenes → Chloroalkanes
氯化氢在烯烃双键两端加成，可生成氯代烷。
- Cyanation: Chloroalkanes → Nitriles
氰根取代生成腈，使碳链增加一个碳原子。
- Amination: Chloroalkanes → Amines
氨取代氯，形成伯胺；过量氨可限制进一步烷基化。
- Elimination: Chloroalkanes → Alkenes
碱促进的消去反应脱去 HCl，生成烯烃。
- Hydrolysis: Bromoalkanes → Alcohols
氢氧根可取代 C-Br 中的溴，形成醇。
- Hydrolysis: Iodoalkanes → Alcohols
氢氧根可取代 C-I 中的碘，形成醇。
- Oxidation: Alcohols → Aldehydes
伯醇经受控氧化可生成醛。
- Oxidation: Alcohols → Ketones
仲醇氧化生成酮。
- Oxidation: Alcohols → Carboxylic acids
伯醇充分氧化生成羧酸。
- Free radical chlorination: Alkanes → Chloroalkanes
光化学氯化可将烷烃转化为氯代烷。
- Hydration: Alkenes → Alcohols
催化水合将烯烃转化为醇。
- Dehydration: Alcohols → Alkenes
脱水将醇转化为烯烃。
参考文献
- Pearson Edexcel Level 3 Advanced GCE in Chemistry specificationPearson Education Limited · Pearson qualifications · 2024
Supports the textbook-core organic reaction routes used for displayed route and mechanism content.
- Core practical 4: Investigate the hydrolysis of halogenoalkanesPearson Education Limited · Pearson qualifications
Matched halogenoalkane comparisons, ethanol/water medium and precipitation timing.
- Rates of hydrolysis: practical videos for 16–18 studentsRoyal Society of Chemistry · RSC Education
Water is the nucleophile in the silver-nitrate comparison, and silver-halide precipitation measures released halide indirectly.
- Pearson Edexcel International Advanced Level Chemistry Student Practical GuidePearson Education Limited · Pearson qualifications · 2018
Supports the practical distinctions between reflux, distillation, liquid-liquid separation, washing and drying in organic preparations.