. The molecular rearrangement of carbon compounds. initial unstable substance, under the conditions of the , gradually changes into the final substance stable tow-ard rearrangement, and that there is a decrease of free energy 56 in the transformation. Up to the present time it has l^een im- possihle to measure this decrease in free energy. In an attempt to discover a criterion of stability in such rearrangements Der- ick^^^ found that if the suhstance involved is an electrolyte, non-reversihle intramolecular rearrangements took place in the direction to decrease the ionization cons
. The molecular rearrangement of carbon compounds. initial unstable substance, under the conditions of the , gradually changes into the final substance stable tow-ard rearrangement, and that there is a decrease of free energy 56 in the transformation. Up to the present time it has l^een im- possihle to measure this decrease in free energy. In an attempt to discover a criterion of stability in such rearrangements Der- ick^^^ found that if the suhstance involved is an electrolyte, non-reversihle intramolecular rearrangements took place in the direction to decrease the ionization constant. The logarithm of 105 the ionization constant of acids and bases was chosen as acriterion of the possibility of rearrangement, that is, of thestability of compounds of this type. The following examples il-lustrate how well Dericks criterion holds for the substancesbefore and after rearrangement: Table I Ionization Constants at 25Uon-reversible Eearrangements K Log K x 10Before After Before After Before After id^ ;CI0^
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