Patent ID: 7973191

Claim:
A method of producing a dibenz[c,e] [1,2]-oxaphosphorin compound of the general formula I wherein a 6H-dibenz[c,e] [1,2]-oxaphosphorin-6-oxide of the general formula II reacts with a compound of the general formula III Z-A Formula III to form the compound of formula I, wherein in the general formulae I, II and III respectively, independently of each other, x and y are 0, 1, 2, 3 or 4, R 1 and R 2 are the same or different and are selected from the group consisting of hydrogen, linear or branched C 1 -C 22 alkyl, linear or branched C 1 -C 22 O-alkyl or O-aryl, alkylsulphonyl, arylsulphonyl, thioaryl, thioalkyl, linear or branched C 3 -C 22 alkenyl, linear or branched C 3 -C 22 alkynyl, linear or branched C 1 -C 22 hydroxyalkyl, linear or branched C 3 -C 22 alkoxycarbonylalkyl, C 3 -C 12 cycloalkyl, C 6 -C 14 aryl, C 7 -C 22 aralkyl, C 7 -C 22 alkylaryl, an optionally substituted piperidin-4-yl group and halogen atoms, A is a primary amine, a secondary amine substituted in a similar or mixed manner, a heterocyclic amine or a hydrazine compound, and Z is hydrogen, lithium, sodium or potassium.