Patent ID: 7943747
Filing Date: 2011-05-17
Classification: C07F

Abstract:
1. A process for the preparation of an 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 represents an integer or fraction greater than or equal to 1; a represents an integer selected from 0, 1, 2 and 3; a′ represents an integer selected from 0, 1 and 2; the sum a+a′ ranges from 0 to 3, with the proviso that: (C1) when a=0, then: either at least one of m, n, o, p is a number different from 0 (zero) and q is greater than or equal to 1; or q is greater than 1 and each of m, n, o, p has any value; and at least one of the symbols G (C2) when a+a′=3, then m=n=o=p=0 (zero); the symbols G the symbols G the symbols G the symbol Z represents a divalent radical selected from a saturated or unsaturated aliphatic hydrocarbon group; a saturated, unsaturated or aromatic monocyclic carbocyclic group; a polycyclic carbocyclic group comprising at least one of a saturated ring, an unsaturated ring and an aromatic ring; and a group having a saturated or unsaturated, aliphatic hydrocarbon moiety and a carbocyclic moiety as defined above; said divalent radical being optionally substituted or interrupted by an oxygen atom and/or a sulfur atom and/or a nitrogen atom, said nitrogen atom, if present, bearing 1 monovalent group selected from a hydrogen atom; an aliphatic, saturated or unsaturated hydrocarbon atom; a saturated or unsaturated and/or aromatic, monocyclic or polycyclic, carbocyclic group; and a group having a saturated or unsaturated, aliphatic hydrocarbon moiety and a carbocyclic moiety as defined above; the symbol A represents: a saturated or unsaturated aliphatic hydrocarbon group; a saturated, unsaturated or aromatic monocyclic carbocyclic group; a polycyclic carbocyclic group comprising at least one of a saturated ring, an unsaturated ring and an aromatic ring, or a group representing 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 process comprising: 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), oxidizing the hydrazino group of precursor (II) to an azo group belonging to the organosilicon compound (I), by means of an oxidizing system which comprises at least one oxidizing agent (Ox) and at least one base (B), said base B comprising an inorganic base of formula (B): M selecting Ox from among the oxidizing agents that oxidize a hydrazine group to an azo group; and further employing an additional reagent selected from among the silanes, whether alone or mixed, of formula (III): in which: the symbols G or a group representing a saturated or unsaturated, aliphatic hydrocarbon moiety and a carbocyclic moiety as defined above; or a polysiloxane residue; the symbols G p1 represents an integer selected from 1 and 2.