“…With the longer-chain ligand, 1,8-bis(diphenylphosphin0)-3,6-dioxaoctane (POOP), a distorted square planar trans-chelate compound, NiI,(POOP), was characterized [ 171'). These flexible-chain diphosphines resemble the prototype ligand system (cyclohexyl),P(CH,),P(cyclohexyl), (n = 3-5) reported by Issleib and Hohyeld [18]. Of these, the ligand with n = 5 forms the trans-chelate NiCl,[(cyclohexyl),-P(CH,),P(cyclohexyl),1 [ 181.…”