Multidentate, Cyclic Phosphorus Ligands with a SiliconPhosphorus Backbone: Template Synthesis of a 1,4,7‐Triphospha‐2,3,5,6,8,9‐hexasilacyclononane and a 1,3,5,7,9,11‐Hexaphospha‐2,4,6,8,10,12‐hexasilacyclododecane

The right template makes it possible: a one-pot cyclocondensation starting from fac-[Mo(CO)3(PH2R)3] (R = cyclohexyl), nBuLi, and 1,2-dichlorotetramethyldisilane gives complex 1 in 48% yield. This is the first complex with a nine-membered tridentate phosphorus ligand. The surprising “fusion” of two 1,3,5-triphospha-2,4,6-trisilacyclohexanes in the presence of CuI and AgI triflates leads to binuclear complexes with an unprecedented hexadentate phosphorus ligand.