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A mechanism is proposed for the substitution of the first halogen atom in N-pentafluorophenylcarbonimidoyl dihalides (ArFN=CX2, X = Cl, Br) by aliphatic amines and includes a tetrahedral intermediate (TE). In the case of the reactions of primary and secondary amines the rate-limiting stage is the formation of the intermediate, and in the case of tertiary amines it is stereomutation of the intermediate...
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