Novel organosilicon compounds and process for the preparation thereof
申请人:Sterin Sebastien
公开号:US20090216001A1
公开(公告)日:2009-08-27
The invention concerns synthesis of functionalized organosilicium compounds comprising at least one activated azo group of formula (I): [(G
0
)
3
SiO
1/2
]
m
[(G
0
)
2
SiO
2/2
]
n
[G
0
SiO
3/2
]
o
[SiO
4/2
]
p
[(G
2
)
a
(G
1
)
a′
(Z-CO—HN═NH—CO-A)SiO
(3-a-a′)/2
]. Said compounds can for example be a mixture of silane species of formula (i
a
): (C
2
H
5
O)
3
Si—(CH
2
)
3
—NH—CO—N═N—COOC
2
H
3
; with siloxane species of formulae: (2i.1
a
): [(CH
3
)
3
SiO
1/2
][(C
2
H
5
O)
2
(CH
2
)
3
—NH—CO—N═N—COOC
2
H
5
}SiO
1/2
] et (2i.2
a
): [(CH
3
)
3
SiO
1/2
]
2
[(C
2
H
5
O)(CH
2
)
3
—NH—CO—N═N—COOC
2
H
5
}SiO
2/2
]. The invention also concerns the method for preparing said compounds (I), which consists in using at least one hydrazino precursor (II) (—HN—NH—) of compound (I), oxidizing the precursor (II) into an azo group for the compound (I) using at least one oxidizing agent (Ox) and at least one vase (B), said method consisting in selecting the base B among mineral bases and Ox among halogens, cyanurated compounds and chlorinated compounds and mixtures thereof, and in using a supplementary reagent selected among silanes (alone or mixed together) of formula (III): (G
o
)
4-p1
Si(G
2′
)
p1
[or example, (CH
3
)
3
(C
2
H
5
O)Si].
The synthesis of purified functionalized organosilicon compounds containing at least one active azo group having formula (I): [(G
0
)
3
SiO
1/2
]
m
[(G
0
)
2
SiO
2/2
]
n
[G
0
SiO
3/2
]
o
[SiO
4/2
]
p
[(G
2
)
a
(G
1
)
a′
(Z-CO—HN═NH—CO-A)SiO
(3-a-a′)/2
] entails providing at least one hydrazino (—HN—NH—) precursor (II) of the compound (I) and oxidizing the precursor (II) into an azo group specific to the compound (I) with the aid of an oxidizing system comprising at least one oxidant (Ox) and at least one base (B), wherein 1) Ox is selected from among the oxidants that can oxidize a hydrazine function into an azo function, with or without the exclusion of N-bromosuccinimide (NBS), 2) and/or Ox (optionally B) is/are employed in stoichiometric quantities in relation to the precursor (II); 3) and/or the organosilicon compounds (I) thus prepared are subjected to a purification post-treatment to eliminate any unwanted residues of the base B used, with the proviso that, when NBS is not excluded, characteristic (1) is combined with characteristic (2) and/or characteristic (3).
Preparation Of Organosilicon Compounds In Two-Phase Medium
申请人:Sterin Sebastien
公开号:US20090215999A1
公开(公告)日:2009-08-27
Thermally stable functionalized organosilicon compounds containing at least one activated azo group, of formula (I): [(G
0
)
3
SiO
1/2
]
m
[(G
0
)
2
SiO
2/2
]
n
[G
0
SiO
3/2
]
o
[SiO
4/2
]
p
[(G
2
)
a
(G
1
)
a′
(Z-CO—HN═NH—CO-A)SiO
(3-a-a′)/2
] are synthesized from at least one hydrazino precursor (II) (—HN—NH—) of the compound (I), oxidizing the precursor (II) into an azo group for the compound (I), employing an oxidizing system including at least one oxidizing agent (Ox) and at least one base (B), such oxidizing being carried out in a two-phase aqueous/organic medium and such that the pH of the aqueous phase ranges from 3 to 11.
PREPARATION OF FUNCTIONALIZED ORGANOSILICON COMPOUNDS IN A BIPHASE MEDIUM
申请人:Vidal Thierry
公开号:US20110282040A1
公开(公告)日:2011-11-17
Functionalized organosilicon compounds (I), including at least one azo-activated structural unit, are prepared by: A. reacting at least one silane precursor (IV) with at least one hydrazo-precursor compound (V) to obtain hydrazine precursors (II) of such organosilicon compounds and B. oxidizing the hydrazine group of the precursors (II) to obtain precursors of the compounds (I), employing an oxidizer (NaOCl) and a base (NaOH), the oxidation being carried out in a biphase aqueous/organic medium, with the pH of the aqueous phase ranging from 3 to 11, such oxidation B being carried out directly in the reaction medium obtained from step A and containing the precursors (II), without isolating these precursors.