Proton chemical shifts of cyclopentadienyl ring protons in a series of substituted bis(cyclopentadienyl)titanium compounds have been correlated with electronegativities of the ligands on titanium.A similar correlation of ring proton shifts with ligand electronegativities was found for a series of methyl-substituted titanocene halides and titanocene dihalides, and a reverse trend was noted when the chemical shift of the methyl protons was considered in the methyl-substituted series. In a series of substituted diaryltitanocenes the average chemical shift of ortho and meta protons relative to the chemical shift of a reference (bis(cyclopentadienyl)diphenyltitanium) as well as the chemical shifts of the cyclopentadienyl ring protons give a linear correlation with Taft's inductive and resonance parameters and a satisfactory Hammett line.
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