Procedure for the preparation of silylated chloroacetanility, of formula I **(See formula)** in which R means a lower alkyl group with at most 4 carbon atoms, a -CH2-OH2-Si (CH3) 3 group, a -CH2-Si (CE3) 3 group or a trimethylsilyl group, Z means a straight or branched alkylene chain, with at most 3 C atoms, R'means halogen, alkyl or lower alkoxy with 3 atoms from 0 at most or trimethylsilyl and n means the number 0 or 1, that constitute the active matter in the composition of agents to influence the growth of plants and especially to combat weeds, by application before their emergence, in the cultivation of useful plants characterized by reacting a substituted aniline of formula IX **(See formula)** with an aldehyde or a cup of formula III **(See formula)** to form a Schiff base of formula IV **(See formula)** then add to the double bond a chloroacetyl halide **(See formula)** with formation of a product of formula V **(See formula)** and then reacted with an alcohol of the formula HO-R, in the presence of a base, to form the final product of the formula I; in whose above formulas, Hal means a halogen atom, preferably chlorine or bromine, and D and E each signify hydrogen or monovalent aliphatic hydrocarbon radicals which together with the C atom to which they are attached constitute the radical -Z-OR, while Z, R, R'and n have the same meaning as in formula I. (Machine-translation by Google Translate, not legally binding)
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