| Popis: |
The basicities of a number of triorganotin hydroxides have been compared by measuring the acid dissociation constants of aquotriorganotin cations in 44% aqueous ethanol (by weight) at 25°. The equilibrium constants are given in concentration constants Kc, valid at an ionic strength of 0.01. Two series of organotin compounds were studied, namely trialkyltin hydroxides and mixed ethylphenyl derivatives. Basicities are influenced by inductive effects but also strongly by steric effects. Whether also an influence of d π - p π overlap exists in the phenyltin series, cannot be clearly distinguished, because much if not all of the pK shift on introduction of phenyl groups can be explained in terms of inductive and steric effects. |
