Amino‐containing derivatives of various structures have been obtained via the Mannich reaction in a series of bicyclic phosphonates based on 2‐methylresorcinol, resorcinol, and pyrogallol with paraformaldehyde and secondary amines via the Mannich reaction. The structure and composition of the obtained compounds have been determined using 31Р and 1Н NMR spectroscopy, IR spectroscopy, mass spectrometry (MALDI‐TOF), and X‐ray analysis.
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