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Energy profile (PBE1PBE) for interconversion of the stable N-benzyl-3-methylpyridine-2-amine 4a rotamers A and B via rotation about the C–N bond. The numbers in parentheses refer to parent N-benzylpyridine-2-amine 1a. Energy values (in kilocalories per mole) are referred to the more stable rotamer A.
