10-(tert-Butyl­dimethyl­silyl)-4,6-bis­(diphenyl­phosphino)phenoxazine

The title compound, C₄₂H₄₁NOP₂Si, used as a nixantphos-type ligand in homogeneous catalysis, crystallizes with one mol­ecule in the asymmetric unit. The mol­ecule has nearly mirror symmetry with N, O and Si on the pseudo-mirror plane, but it is not located on a crystallographic mirror plane. The most important feature of the mol­ecule is the intra­molecular P-P distance of 4.1453 (12) Å. The bond angles involving the P atoms are in the range 100.32 (14)-103.04 (15)°.