Process for preparing organic phosphorus compounds

Details Process for preparing organic phosphorus compounds Process for preparing organic phosphorus compounds

C - Chemistry, Metallurgy

07

F

260/458.6

C07F 9/40 (2006.01) C07F 9/6574 (2006.01) D06M 13/288 (2006.01)

Patent

CA 1104581

ABSTRACT OF THE DISCLOSURE There is disclosed a process for preparing organic phosphorus com- pounds, the process including the steps of: reacting (a) a cyclic halogeno- phosphite expressed by the general formula (I) Image (I) (in which Z is -CH2- or -CH2CH2- and R2 represents a hydrogen atom, a methyl group or an ethyl group when Z is -CH2- and R2 represents hydrogen or a methyl group when Z is -CH2CH2-, and X1 represents a halogen atom), with (b) a cyclic phosphorous acid ester expressed by the general formula II Image (II) (in which R1 and Y have the same meanings, respectively as are given for R2 and Z above, and RB represents an alkyl group containing 1 - 4 carbon atoms or a halogenated alkyl group containing 2 - 4 carbon atoms), and (c) acetone in a molar ratio of about 1:1:1; subjecting the resulting reaction product to halogenation to give a compound expressed by the general formula (III) Image (III) (in which RA represents Image or Image formed on the basis of ring cleavage of the compound of the general formula (II), RC represents Image or Image formed by ring cleavage of the compound of the general formula (I), X1 of the RA represents the halogen atom derived from the compound of the formula (I), and X2 of the RC represents the halogen atom derived from the halogenation reaction); and esterifying the compound of the general for- mula (III) to give an organic phosphorus compound expressed by a general formula (IV) (IV) Image (in which RA, RB and RC have the same meanings as defined in formula (III), and RD represents an alkyl group containing 1 - 4 carbon atoms or a halogenated alkyl group containing 2 - 4 carbon atoms), The products of the process are useful particularly as fire retardant additives for polyurethane foams.

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