A more convenient and economic method has been developed for synthesizing bis (4 bromophenyl)phosphine oxide in a high yield, which was introduced to prepare three water soluble phosphine precursors successfully. All new compounds were fully characterized by IR, 1H NMR, 13 C NMR , 31 P NMR , MALDI TOFMS and elemental analyses.
A series of bridged ligand 4,4′-methylene-bis [2,6-dialkyl-N-(2-phenylmethylene)-anil] was efficiently synthesized by the condensation reaction of 4,4′-methylene-bis(2,6-disubstituted aniline) and salicyl aldehyde.They easily coordinated with Ni (Ⅱ) to form the title complexes,which were characterized by IR spectroscopy and elemental analysis.The complexes show good activities for vinyl polymerization of norbornene with methylalumoxane (MAO) as co-catalyst.The variations of complexes and catalytic parameters were investigated along with viscosimetric measurement of resultant polynorbornenes.
