Synthesis and X-ray molecular structure of cis, cis-1,3,5-Tris(diphenylphosphino)- 1,3,5-tris(methoxycarbonyl) cyclohexane

Abstract

The novel tripodal phosphine ligand cis, cis-1,3,5-tris(diphenylphosphino)-1,3,5-tris(methoxycarbonyl)cyclohexane (tdppcyme) ( 2) has been synthesized. 1H, 13C and 31P NMR spectroscopy shows that in solution the sterically demanding diphenylphosphine groups occupy equatorial positions on the cyclohexane ring. An X-ray crystal investigation confirms this result for the solid state. Treatment of tdppcyme with Mo( η 6-C 7H 8)(CO) 3 gives Mo(tdppcyme)(CO) 3 ( 3), with octahedral molybdenum coordination.