The diohlorides of bis (methyloyolopentadienyl)titanium,ziroonium and hafnium reaot with phenol or substituted phenols in the presence of a base give a series of new bis (methyloyolopentadienyl) di (arylogy) metal derivatives. The di (arylozy) compounds react with concentrated hydrohalogen acids, such as HF, HCl, HBr and HI to form the corresponding bis (methyloyolopentadienyl) metal dihalides. The influence upon the chemical shifts of the oyolopentadienyl ring proton in bis (methyloyolopentadienyl) di (arylogy) metal derivatives of the eleotronegativities of the metals and the snbstitnents on the phenyl ring, as well as the number and position of the snbstituents were discussed, and the assignments of IR bands of these compounds were proposed.