Benzyl
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Benzyl

Benzyl

Product Description

Systematically and professionally introduce Benzyl (benzyl group / phenylmethyl group), including its structure, nomenclature, chemical properties, synthetic applications, and industrial/commercial relevance, to facilitate its accurate application in peptide product development and chemical engineering scenarios.
I. Basic Definition and Structure
  1. Chemical formula: C₆H₅CH₂− (monovalent radical), commonly abbreviated as Bn in organic chemistry (note the distinction: Bz stands for benzoyl group C₆H₅CO−)
  2. Structural characteristics: Composed of a benzene ring linked to a methylene group (-CH₂−); can be regarded as the residue formed by the loss of one hydrogen atom from the methyl group of a toluene molecule; the methylene carbon is the benzylic carbon, which exhibits significant reactivity due to the conjugative stabilization effect of the benzene ring.
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  3. 读音：英 /ˈbenzɪl/，美 /ˈbenzaɪl/

二、关键化学性质

  1. 稳定性与活性：苄基碳形成的碳正离子、自由基、碳负离子均受苯环 π 电子离域稳定，因此苄位易发生：
    • 卤代（如甲苯侧链氯化生成苄基氯）
    • 氧化（如被 KMnO4 氧化为苯甲酸）
    • 还原、取代反应
  2. 保护基应用：有机合成中最常用的羟基 / 氨基保护基之一
    • 保护方法：用苄溴（BnBr）+ 强碱（如 ）生成苄醚；用氯甲酸苄酯（CbzCl）保护氨基
    • 脱保护：常用催化氢化（H2/Pd-C）或 Lewis 酸（如 BBr3）温和脱除，不影响多数其他官能团
  3. 衍生化：可形成多种常用试剂，如苄醇（BnOH）、苄胺（BnNH2）、溴化苄、乙酸苄酯

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