Potassium and Yttrium Complexes of a Rigid Bis‐Phosphido POP‐Donor Ligand

Dilithiation of 4,5‐dibromo‐2,7‐di‐ tert ‐butyl‐9,9‐dimethyl‐xanthene (XBr 2 ) followed by addition of 2 equiv. of (2,4,6‐triisopropylphenyl)dichlorophosphine (TrippPCl 2 ) afforded 4,5‐bis[(2,4,6‐triisopropylphenyl)chlorophosphino]‐2,7‐di‐ tert ‐butyl‐9,9‐dimethylxanthene (XP 2 Cl 2 ), which was reduced to 4,5‐bis[(2,4,6‐triisopropylphenyl)phosphino]‐2,7‐di‐ tert ‐butyl‐9,9‐dimethylxanthene (H 2 XP 2 ) using excess LiAlH 4 . Deprotonation of H …