Esters of the formula R8-CZ-NR2-CH(CX3)-P(O)(OR3)2 (I) (where R8 and R2 are H or an (cyclo)aliphatic, araliphatic or aromatic residue, or R2 and R8 may be linked to form a heterocyclic residue, and R8 can also be the group -ZR4, -NR5R6 or (R3O)2P(O)-CH(CX3)-NR6-; each R3 (same or different) is an aliphatic residue, or two R3's may be linked to form an aliphatic residue; R4-6 are aliphatic or aromatic residues, or R5 and R6, R4 and R2, or R6 and R2 may be linked to form a heterocyclic residue; Z is O or S; and each X (same or different) is halogen), which are flameproofing agents for textiles and plastics and are also useful as inters. for flameproofing agents, plastics and paint additives, dyes and plant protection agents, are prepd. by reacting cpds. of the formula R9-CZ-NR2-CHX-CX3 (where R9 is R8 or the residue -NR6-CHX-CX3) with a phosphite of the formula P(OR3)3.
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