By Y. Mastai
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It has to be mentioned, that the enantiomeric mixture found in the crystalline diastereoisomer is usually much purer than that is isolated from the filtrate. Pope and Peachey38 have been recognized that if the half of the resolving agent necessary for the better soluble diasteroisomer is replaced by an achiral reagent (having the same chemical character as it is for the resolving agent) the less soluble diastereoisomer will be 21 Separation of the Mixtures of Chiral Compounds by Crystallization crystallized and the other isomer remains in the solution as a salt of the applied achiral additive.
The efficiency of the resolution (S = F, see above in point 1)14 can be calculated by means of the next formula, using the known thermodynamic constants data, and the concentrations of the starting compounds (co = concentration of the racemic compound, [RH]o =concentration of resolving agents) and of [H+] = proton concentration, as well. 5c0 y − ( K sL + K sD ) 0 From the relationship deduced on basis of the model the regularity of several „rule of thumb” based on experimental observations were justified.
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