The unprecedented formation of molybdenum-centred 1,1,4,4-tetrakis(phosphino)buta-1,3-diene from niobium-centred bis(phosphino)acetylene
Abstract
Photoreaction between [NbI(CO)2(PMe2Ph)2(Ph2PCCPPh2)](with the side-on coordinated alkyne acting as a four-electron donor) and [Mo(CO)6] yields the C–C coupling product [{Mo(CO)4}2{µ-(Ph2P)2C
CHCH
C(PPh2)2}], where the ligand coordinates end-on through the four phosphine functions.