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spending amines la-7a or with the As values were not successful. However, a qualitative trend as anticipated does occur for the species la-3a and for the secondary amines 3a, 5a, and 6a, while the tertiary amine 4a is found to be out of place owing to the steric B-strain. As we have suggested earlier,* 234 acidity constant of a compound depends on several factors. Hybridization of an acid and its conjugate base, of course, may be one of the most important ones governing the relative energy difference between them. However, steric effect may also play a significant role.

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