Polymerization of ethylene in the presence of 1,3-dimethoxy-p-But-calix[4]arene titanium dichloride. NMR evidence of the cationic titanium compound generated by methylalumoxane

In this paper we present, for the first time, the NMR investigation of the solution structure of the alkyl cationic titanium compound produced by reaction of 1,3-dimethoxy-p-But-calix[4]arene titanium dichloride and methylaluminoxane in the required conditions of ethylene polymerization. The role the methylalumoxane plays in the reaction with titanium compound is analyzed by NMR.