Binding properties of coal-tar pitches in relation to nuclear magnetic resonance spectra

The yield of quinoline-insoluble portion from pitches correlates well with the aromatic hydrogen content of the carbon disulphide-soluble fraction scaled up by proportion to the whole pitch, which therefore by implication is an indication of the binding properties. The chemical shifts are explained with reasonable accuracy on the basis of the ring-current, model of Pople applied to fluorene and acenaphthene, which form the chief components of the pitches normally encountered.