Abstract The synthesis of a novel class of sterically demanding diphosphonites 1–8, based on rigid backbones, is described. The starting materials are all commercially available and the methodology allows for a modular approach. All ligands have been fully characterized, including an X-ray crystal structure for compound 1, 4, 5-bis {di [(2-tert-butyl) phenyl] phosphonito}-9, 9-dimethylxanthene. The coordination of these diphosphonite ligands ...
![P,P′-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis[N,N,N′,N′-tetraethyl-phosphonous diamide] Structure](https://image.chemsrc.com/caspic/045/349100-75-0.png)
