The synthesis of a broad library of new P-chirogenic Xantphos ligands is reported. A special feature is 2,7-di-tert.-butyl substituents in the backbone which requires the modification of the original synthetic approach. In comparison to related ligands reported formerly the substitution has a considerable influence on the results (yield and % e.e.) of metal catalyzed reactions, e.g. asymmetric rhodium catalyzed hydrogenation of isophorone and the palladium catalyzed alkylation, respectively.

中文翻译：

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新的P-深绿叔胺。丁基-黄原磷配体及其在不对称氢化和烷基化中的应用

报道了合成新的P-手性Xantphos配体的广泛文库。比较特别的是2,7-二-叔-在需要原来的合成方法的变形例的主链丁基的取代基。与先前报道的相关配体相比，取代对金属催化反应的结果（产率和％ee）有很大影响，例如分别由不对称铑催化的异佛尔酮氢化和钯催化的烷基化。