Process for the preparation of 2 - substituted Derivatives of phosphonic acid 5 - fenoxifenil - General formula (i). To react, at temperatures between 50 and 150gc, 3,4 - dinitrodifenilico ether of formula (ii) with a Tri alkyl phosphite P (or '') 3, obtaining an intermediate Compound from which are obtained by methods known Derivatives of General formula (i).In the formulas above have the following meanings, R1 and R2 are each, independently of each other, hidroxilicos alkoxyl groups, or, Alquiltio, alquilamino or dialquilamino and chlorine, bencioxilo or benciltio; X represents Halogen or a Cf3 Group -, NO2 -, - CN, - with 2, or - csnh2; and represents a Halogen or - Cf3 Group, NO2 -, - CN, - Oh, - NH2, - NH - H - R- NH - coor - nhso2 or - R (Where R is a Lower radical alquilico eventually Halogenated); n represents an integer value of 0 to 3, and R '' means Lower alkyl radicals. * * formula
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