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SYNTHESIS OF CHIRAL LIGAND WITH PERFLUOROALKYL GROUPS FOR HIGHLY EFFECTIVE ASYMMETRIC SYNTHESIS

机译:高效全不对称合成具有全氟烷基的手性配体

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A symmetric synthesis is one of the most attractive projects in recent organic chemistry, and. many chiral ligands have been synthesized and used for this purpose. We have reported highly effective axially dissymmetric ligands with two chiral fiuoroalkyl carbinol moieties (1)'. Characteristics of 1 are: 1. Axial chirality is controlled by the chirality of the chiral centers; this means that inactive axial isomer is thermally converted to active isomer. 2. Perfluoroalkyl groups stabilize the hydroxyl groups. 3. Perfluoroalkyl groups enhance the acidity of the hydroxyl groups and that of metal coordinated to these hydroxyl groups. This causes enhancement of activity. 4. One with long perfluoroalkyl groups are easily recovered with fluorous solvent and can be reused without purification.
机译:对称合成是最近有机化学中最有吸引力的项目之一。已经合成了许多手性配体并将其用于此目的。我们已经报道了具有两个手性氟烷基甲醇部分的高效轴向不对称配体(1)'。 1的特征是:1.轴向手性受手性中心的手性控制;这意味着无活性的轴向异构体被热转化为活性的异构体。 2.全氟烷基稳定羟基。 3.全氟烷基增强了羟基的酸度以及与这些羟基配位的金属的酸度。这导致活动的增强。 4.具有长的全氟烷基的化合物很容易用氟溶剂回收,无需纯化即可重复使用。

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