<http://purl.org/dc/terms/description>
"The synthesis of two new diiminophosphine proligands, CY\u2075[NPN]DMPH\u2082  (DMP = 2,6-Me\u2082C\u2086H\u2083) and CY\u2075[NPN]DIPPH\u2082 (DIPP = 2,6-iPr2C\u2086H\u2083), is reported.  These two proligands feature a cyclopentane ring linker between the phosphine and imino donors.  The precursors of the proligands were prepared from cyclopentanone and the corresponding substituted aniline.  After lithiation and slow addition of PhPCl\u2082, the diiminophosphine proligands could be obtained.  It is easy to vary the bulkiness of the proligands in this synthetic strategy.  The synthesis of a diamidodioxo ligand based on the scaffold of calix[4]arene was also attempted. \nThe bis(dimethylamido)zirconium complexes of the two ligands, CY\u2075[NPN]DMP and CY\u2075[NPN]DIPP, were prepared via protonolysis from the proligands and Zr(NMe\u2082)\u2084.  The dichlorozirconium or diiodozirconium species could be obtained from the corresponding bis(dimethylamido)zirconium complex upon addition of excess Me\u2083SiCl or Me\u2083SiI.  Most of the zirconium complexes are well characterized in the solid state by single crystal X-ray diffraction.  \nA Zr-N\u2082 complex, {CY\u2075[NPN]DMPZr(THF)}\u2082(\u00B5-\u03B7\u00B2:\u03B7\u00B2-N\u2082), was synthesized from CY\u2075[NPN]DMPZrCl\u2082 and 2.2 equivalents of KC\u2088 in THF under 4 atm of N\u2082.  By single crystal X-ray analysis, N\u2082 has been reduced to an N\u20824- unit and is side-on bound to two Zr atoms.  However, large number of side products was observed in the reaction.  The reduction of CY\u2075[NPN]DIPPZrCl\u2082 was also attempted.  From the minor product identified from single crystal X-ray diffraction, the cyclopentene ring linker was cleaved in the reduction of CY\u2075[NPN]DIPPZrCl\u2082."@en
<https://open.library.ubc.ca/cIRcle/collections/ubctheses/24/items/1.0060341>