The present invention provides a step-wise process for preparation of a bisphosphite. In step (a) the process prepares a phosphoromonochloridite in high yield, by contacting phosphorus trichloride with an aromatic diol in a slurry under reaction conditions and in the presence of a second aromatic diol to produce a mixture comprising the phosphoromonochloridite, the second aromatic diol, and excess PC13. The slurry comprises less than 5 mole percent of a nitrogen base, and the organic solvent is selected for its low hydrogen chloride solubility. After removing the excess PC13, a nitrogen base is added to effect condensation of the phosphoromonochloridite with the second aromatic diol to yield the bisphosphite. The invention particularly provides a process for preparing 6, 6' - (3,3',5,5' -tetra-tert-butylbiphenyl-2, 2' -diyl)bis (oxy) didibenzo [d, f ] [1,3,2] dioxaphosphepine by the above route.
本发明提供了一种逐步过程,用于制备
双膦酯。在步骤(a)中,该过程通过在反应条件下将
三氯化磷与芳香二醇在悬浮液中接触,并在第二芳香二醇的存在下高产率地制备
磷单
氯代物,从而产生包含
磷单
氯代物、第二芳香二醇和过量PC13的混合物。悬浮液中包含不到5摩尔百分比的氮碱,有机溶剂被选中以确保其低
氯化氢溶解度。在去除过量PC13后,添加氮碱以促使
磷单
氯代物与第二芳香二醇发生缩合反应,从而生成
双膦酯。该发明特别提供了一种通过上述途径制备6,6'-(
3,3',5,5'-四叔丁基
联苯基-2,2'-二基)双(氧)二苯并[d,f][1,3,2]二氧杂
磷环的方法。