high bioactivities in organic chemistry. There are few reports about the direct construction of C–O bonds by O-alkylation of oximes with alcohols, particularly the development of catalytic systems. Herein, a simple catalytic system only including H3PW12O40·xH2O was established for the O-alkylation of oximes with alcohols in dimethyl carbonate as the green solvent, which simplified the reaction systems
C-O键作为重要的结构骨架,在有机化学中表现出很高的生物活性。关于通过肟与醇的O-烷基化直接构建 C-O 键的报道很少,特别是催化体系的开发。本文以碳酸二甲酯为绿色溶剂,建立了仅含H 3 PW 12 O 40 · x H 2 O的简单催化体系,用于肟与醇的O-烷基化反应,简化了反应体系,实现了催化转化,提高了催化效率。产率和选择性。所开发的体系具有广泛的底物适用范围和良好的官能团耐受性。它适用于O-芳香族或脂肪族酮肟和醛肟,以及带有杂原子的肟与苯甲醇、脂肪醇、烯丙醇等的烷基化,产率高达98%。而肟醚的克级反应和进一步转化也取得了较好的进展。三苯甲基四氟硼酸酯代替三苯甲醇仍然生成所需的产物,这表明 Ph 3 C +会被肟捕获,反应经历碳阳离子过程。紫外-可见光谱中 404 和 433 nm 处新波段的出现和减弱进一步证明了反应过程中碳正离子的形成。FT-IR光谱中吸收峰的变化和不同酸的对照实
A general synthesis of N-hydroxyamino acids
作者:Eberhard Buehler、George Bosworth Brown
DOI:10.1021/jo01288a003
日期:1967.2
CONTROLLED RELEASE OF ACTIVE COMPOUNDS FROM DYNAMIC MIXTURES
申请人:Herrmann Andreas
公开号:US20100226875A1
公开(公告)日:2010-09-09
The present invention relates to a dynamic mixture in the form of a dynamic mixture obtained by reacting together, in the presence of water, at least one O-substituted hydroxylamine or S-substituted thiohydroxylamine derivative with at least one perfuming, flavoring, insect repellent or attractant, bactericide or fungicide aldehyde or ketone. This mixture is capable of releasing in a controlled and prolonged manner the aldehyde or ketone into the surrounding environment. Furthermore, the present invention concerns also the use of these dynamic mixtures as perfuming ingredients as well as the perfuming compositions or perfumed articles that include these mixtures.