Compounds in which one or more of the
OH groups of phosphoric acid have been replaced with an amino or substituted amino group; commonly confined to the phosphoric triamides,
P(=O)(NR2)3, since replacement of one or two
OH groups produces phosphoramidic acids
P(=O)(OH)(NR2)2,
P(=O)(OH)2(NR2).
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1358 (https://doi.org/10.1351/pac199567081307)