原酸酯(Orthoester)是原酸(羧酸的水合物,RC(OH)3)形成的酯類,即是在同一碳原子上含有三個烷氧基基團的有機化合物。例子包括原甲酸乙酯(HC(OC2H5)3)和原乙酸乙酯(CH3C(OCH2CH3)3)。最簡單的原酸酯是原甲酸酯。原酸酯對鹼穩定,但易被酸分解,可用作酯的保護基,也可以與醛或酮反應,引入縮醛或縮酮保護基。[1]
製備
- RCN + 3 R'OH → RC(OR')3 + NH3
- CHCl3 + 3CH3CH2ONa → HC(OCH2CH3)3 + 3NaCl
反應
- RC(OR') 3 + H2O → RCO2R' + 2 R'OH
參考資料
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