The core principle governing acid-base reagent selection is that equilibrium shifts toward the side containing the weaker acid (the species with the higher pKa value). To drive a reaction to completion in organic synthesis, one must select an appropriate conjugate pair such that the difference between the pKa of the desired product's acidic proton and the pKa of the base/acid reagent is at least two units. This theoretical framework ensures that the ratio of products to reactants exceeds 10:1 or 100:1, effectively rendering reactions irreversible for practical synthetic purposes within the domain of physical organic chemistry and equilibrium thermodynamics.
The core principle governing acid-base reagent selection is that equilibrium shifts toward the side containing the weaker acid (the species with the higher pKa value). To drive a reaction to completi…