 Geminal substitution (source code)

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= Geminal substitution

In <geminal substitution>, two incoming groups replace substituents on the same central atom. In cyclotriphosphazenes, $\mathrm{PCl_2\to PR_2}$ gives a geminal pair. Primary amino groups can enable a base-catalyzed proton-abstraction/chloride-elimination route that is unavailable after substitution by a secondary amine.

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