| 摘要 |
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 PCl3. 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 PCl3, 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. |
