Carboxylation of Phenol Derivatives. XXII. Formation of Alkali Alkyl Carbonate by the<i>O</i>-Carboxylation of Alcohol in the Presence of an Alkali Salt of a Weak Acid
作者:Ichiro Hirao、Taketoshi Kito、Takatomo Funamoto、Taketoshi Murakami、Katsuyuki Usami
DOI:10.1246/bcsj.49.2775
日期:1976.10
O-Carboxylation of the alcohol (ROH) occurred to give alkali alkyl carbonate in a good yield when carbon dioxide was introduced into the mixture of an alkali salt of a weak acid, alcohol, and acetone (or THF) at room temperature under atmospheric pressure. Such alkali salts as PhOM, p-R′C6H4OM (R′=CH3, CH3O, or Br), Et2NCSSM, NaCN, and C6H4(CO)2NK (M=K or Na) were effective. The mixture of HOC6H4COOM and ROCOOM was obtained from the reaction using MOC6H4COOM as an alkali salt. However, the mixture was composed of equimolar amounts of p-HOC6H4COOM and ROCOOM when p-MOC6H4COOM was used. In this reaction, two mechanisms have been examined.
在常温常压下,将二氧化碳引入弱酸碱盐、醇和丙酮(或四氢呋喃)的混合物中,醇(ROH)发生 O-羧化反应,生成碱式碳酸烷基酯,收率很高。PhOM、p-R′C6H4OM(R′=CH3、CH3O 或 Br)、Et2NCSSM、NaCN 和 C6H4(CO)2NK(M=K 或 Na)等碱盐均有效。用 MOC6H4COOM 作为碱式盐进行反应,可以得到 HOC6H4COOM 和 ROCOOM 的混合物。然而,当使用对 MOC6H4COOM 时,混合物由等摩尔量的对 HOC6H4COOM 和 ROCOOM 组成。在这一反应中,对两种机理进行了研究。