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US 2023/0057557 A1Published application
Silirane compounds as stable silylene precursors and their use in the catalyst-free preparation of siloxanes
AssigneeWacker Chemie AG
InventorsRichard WEIDNER, Fabian Andreas David Herz, Matthias Fabian NOBIS, Bernhard RIEGER
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Abstract
A silirane-functionalized compound that consists of a substrate to which a least two silirane groups of the formula (1) are covalently bonded, a mixture containing the silirane-functionalized compounds, and a process for preparing siloxanes using the mixture are described herein.
Claims13
1-12. (canceled)
Silirane-functionalized compounds consisting of a substrate on which at least two silirane groups of the formula (I)
- are covalently bonded,
- where in formula (I) the index n adopts a value of 0 or 1;
- and where the radical Ra is a divalent C1-C20 hydrocarbon radical;
- and where the radical R1 is selected from the group consisting of (i) C1-C20 hydrocarbon radical, (ii) C1-C20 hydrocarbonoxy radical, (iii) silyl radical —SiRaRbRc, in which the radicals Ra,Rb,Rc independently of one another are selected from the group consisting of C1-C6 hydrocarbon radical, (iv) amine radical —NRx2, in which the radicals Rx independently of one another are selected from the group consisting of (iv.i) hydrogen, (iv.ii) C1-C20 hydrocarbon radical, and (iv.iii) silyl radical —SiRaRbRc, in which the radicals Ra,Rb,Rc independently of one another are a C1-C6 hydrocarbon radical, and (v) imine radical —N═CR1R2, in which the radicals R1,R2 independently of one another are selected from the group consisting of (v.i) hydrogen, (v.ii) C1-C20 hydrocarbon radical and (v.iii) silyl radical —SiRaRbRc, in which the radicals Ra,Rb,Rc independently of one another are a C1-C6 hydrocarbon radical;
- and
- where the radicals R2,R3,R4,R5 independently of one another are selected from the group consisting of (i) hydrogen, (ii) halogen, and (iii) C1-C20 hydrocarbon radical, in which the radicals R2 and R4 may also be part of a cyclic radical,
- where the compound of the formula
- in which Bbt is 2,6-[CH(SiMe3)2]-4-[C(SiMe3)3]—C2H6 is excluded.
5 more elements
A mixture comprising
- a) at least one silirane-functionalized compound as claimed in any of claims 1-7;
- and
- b) at least one compound A which has in each case at least two radicals R′, where the radicals R′ independently of one another are selected from the group consisting of (i) —Si—H, (ii) —OH, (iii) —CxH2x—OH, in which x is an integer in the range of 1-20, (iv) —CxH2x—NH2, in which x is an integer in the range of 1-20, (v) —SH, and (vi) —Ran—CR═CR2, in which Ra is a divalent C1-C20 hydrocarbon radical and the index n adopts a value of 0 or 1 and the radicals R independently of one another are selected from the group consisting of (vi.i) hydrogen and (vi.ii) C1-C6 hydrocarbon radical.
Dependencies are inferred from the claim text.