Although an amine nitrogen atom containing an electron pair and bonded to three different groups is technically a stereogenic center, the chirality of the amine nitrogen is often ignored. Why is that?
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Because there is usually slow interconversion between the two isomeric forms at room temperature.
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Because there is usually rapid interconversion between the two isomeric forms at room temperature.
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Because chirality only exists with the tetrahedral carbon atoms.
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Because four bonds a are needed to define a stereogenic center.
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