Patent ID: 8367812
Filing Date: 2013-02-05
Classification: C07F

Abstract:
1. A method for the preparation of at least one organosilicon compound of the following formula (I): in which: m, n, o, p each represent an integer or fraction greater than or equal to 0; q is an integer or fraction greater than or equal to 1; a is an integer selected from among 0, 1, 2 and 3; a′ is an integer selected from among 0, 1 and 2; the sum a+a′ ranges from 0 to 3, with the following conditions: the symbol A is: a saturated or unsaturated, aliphatic hydrocarbon group; a saturated, unsaturated or aromatic, monocyclic or polycyclic, carbocyclic group; or a group including a saturated or unsaturated, aliphatic hydrocarbon moiety and a carbocyclic moiety as defined above; a group —X-G or, when q=1, a group [—Z—SiO said method comprising: (i) providing at least one precursor (II) of at least one organosilicon compound (I), said precursor having the following formula (II): in which the symbols G 0 , G 1 , G 2 , Z, A, m, n, o, p, a, a′ and q are as defined above under formula (I); (ii) oxidizing the hydrazino group of said precursor (II) to an azo group belonging to the organosilicon compound with activated azo group(s) (I), by means of an oxidizing system comprising at least one oxidizing agent (Ox) and at least one base (B); and (iii) in the event that condition (C1) exists, employing an additional reagent selected from among the silanes (either alone or as a mixture) of formula (III): in which: the symbols G the symbols G p1 is an integer selected from 1 and 2; wherein: 1) Ox is selected from the group consisting of bromine, tert-butyl hypochlorite, trichloroisocyanuric acid, chlorine, and mixtures thereof; 2) and/or Ox (optionally B) is (are) employed in stoichiometric amounts relative to precursor (II); and 3) and/or the organosilicon compounds (I) thus prepared are purified to remove any unwanted residues of the base B, the method further comprising purifying said organosilicon compounds (I) by contacting same with an impurities trap, such trap being selected: from an ionic-affinity support; and/or from a chemical-affinity support.