Indications of the relative base strengths of certain organometallic bases from the proton magnetic resonance dilution shifts in chloroform

Abstract

The basicity of a number of a series of organometallic bases has been studied by their hydrogen-bonding with chloroform. The shift of the chloroform proton resonance in infinitesimal concentration in base is compared with other basicity measurements for these compounds. The importance of comparing only isostructural series by this method is emphasised, and serious anomalies due to steric effects are noted.