Highly electron-deficient and less sterically-hindered phosphine ligands with two or three 1,3,5-triazinyl groups on the phosphorus atoms have been synthesized and examined in transition metal-catalyzed reactions for the first time. Due to the lack of any hydrogens or substituents at ortho-positions of the 1,3,5-triazine towards the phosphorous atom, it is considered that the steric hindrance of the tris(triazinyl)phosphine ligand to a metal center is least among triarylphosphine ligands. In the Stille coupling of aryl iodides, these electron-poor phosphine ligands provided good product yields compared to hitherto well-known phosphine ligands.

中文翻译：

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具有1,3,5-三嗪基的高度缺电子且空间受阻较少的膦配体的开发

首次合成并在过渡金属催化的反应中研究了高度缺电子且空间受阻较少的磷配体，该配体在磷原子上具有两个或三个1,3,5-三嗪基。由于在1,3,5-三嗪对磷原子的邻位上没有任何氢或取代基，因此认为三芳基膦中三（三嗪基）膦配体对金属中心的空间位阻最小。配体。在芳基碘的斯蒂勒偶联中，与迄今众所周知的膦配体相比，这些电子贫乏的膦配体提供了良好的产物产率。