Abstract: A method for producing compounds of formula (I) in which the radical R1 is selected from —NH2, —NH2-zAz, and monovalent alkyl and aryl radicals, the radicals A are selected in each case independently of one another from the phosphoryl radicals DOPO-, DPhPO- and DPhOPO-, and the indices x, y and z, in each case independently of one another, stand for 0 or 1, wherein at least one of the indices is ?0, by reacting, in a first step, melamine or, when R1 is an alkyl or aryl radical, the corresponding alkyl or aryl guanamine, with one or more of the corresponding phosphinyl chlorides DOP-CI, DPhP-Cl and DPhOP-CI, in order to bond one or more phosphinyl radicals to the amino groups(s) of the melamine or guanamine, and in a second step oxidizing the phosphinyl radical(s) by reaction with an oxidizing agent to give the corresponding phosphoryl radical(s).

Abstract: A method for producing compounds of formula (I) in which the radical R1 is selected from —NH2, —NH2-z Az, and monovalent alkyl and aryl radicals, the radicals A are selected in each case independently of one another from the phosphoryl radicals DOPO—, DPhPO— and DPhOPO—, and the indices x, y and z, in each case independently of one another, stand for 0 or 1, wherein at least one of the indices is ?0, by reacting, in a first step, melamine or, when R1 is an alkyl or aryl radical, the corresponding alkyl or aryl guanamine, with one or more of the corresponding phosphinyl chlorides DOP—CI, DPhP—Cl and DPhOP—CI, in order to bond one or more phosphinyl radicals to the amino groups(s) of the melamine or guanamine, and in a second step oxidising the phsophinyl radical(s) by reaction with an oxidising agent to give the corresponding phosphoryl radical(s).

Abstract: The invention relates to ammonium salts of 9,10-dihydro-10-hydroxy-9-oxa-10-phosphaphenanthrene-10-one or -10-oxide (DOPO-OH) of formula I: wherein X is selected from ammonia, melamine, and guanidine, as well as ring-opened hydrolyzates thereof according to the following formula II: wherein X is defined as above.