Alkenyl polysiloxane compound as well as preparation method and application thereof

Abstract

The invention discloses an alkenyl polysiloxane compound as well as a preparation method and application thereof, one alkenyl polysiloxane compound molecule contains two or more alkenyl siloxane segments, in the preparation process, hydrosilylation reaction of internal alkyne and trisubstituted siloxane can be catalyzed through a cyclopropane skeleton 1, 4-diphosphorus cobalt complex, and the alkenyl polysiloxane compound is obtained. The aryl-substituted alkenyl polysiloxane compound and the silicon-substituted alkenyl polysiloxane compound are respectively obtained under the use of two different additives. The chemical structure of the prepared alkenyl polysiloxane compound contains a plurality of silicon-oxygen bonds and carbon-carbon double bonds, so that the alkenyl polysiloxane compound has the potential of olefin polymerization and siloxane polymerization, and has a good application prospect in polymer modification.

Description

Technical Field

[0001] The present invention relates to the technical field of organic silicon, and in particular to an alkenyl polysiloxane compound and a preparation method and application thereof. Background Art

[0002] Silicone is widely used in aerospace, construction, chemical industry, food and medical fields as plastics, coatings, insulating and thermally conductive materials, cosmetic additives, etc. It is also widely used in organic synthesis as an important synthetic raw material. Among them, vinyl siloxane compounds have excellent high and low temperature resistance, oxidation resistance, dielectric properties and mechanical strength, and are one of the commonly used crosslinking agents in silicone rubber. Chinese patent CN118325343A discloses a preparation method for room temperature vulcanized silicone rubber for prosthetic fixation. The specific preparation method includes the following steps: 1) dissolving vinyl siloxane in n-hexane and stirring until it is honey-like; 2) adding fumed silica, calcium carbonate and titanium dioxide to the honey-like vinyl siloxane and stirring and mixing thoroughly; 3) adding hydrogen-containing silicone oil and placing it in a vacuum drying oven for initial vacuum degassing; 4) adding inhibitors and platinum catalysts for secondary vacuum degassing; 5) pouring the fluid silicone rubber semi-finished product on a flat mold for room temperature vulcanization reaction, and finally obtaining a silicone rubber product for prosthetic fixation with good mechanical properties, air permeability and elastic toughness. This shows that the use of vinyl siloxane as a raw material in the preparation process of silicone rubber can improve the performance of the product.

[0003] Commonly used vinyl siloxane compounds include vinyl trimethoxysilane, vinyl triethoxysilane, methyl vinyl dimethoxysilane, acryl trimethoxysilane, vinyl tri (2-methoxyethoxy) silane, etc. However, the above vinyl siloxane compounds contain mostly one alkenyl siloxane fragment, which seriously reduces the reactivity during the application of silicone, and further reduces the crosslinking density, mechanical properties, heat resistance, oxidation resistance, etc. Therefore, it is of great significance to modify the structure of vinyl siloxane compounds and introduce more alkenyl siloxane fragments into the molecule.

[0004] The synthesis of vinyl siloxane compounds mainly utilizes the hydrosilylation reaction of alkynes. This synthesis process has the advantages of 100% atom economy and mild conditions, and can be synthesized from bulk industrial raw materials, providing strong support for the commercial application of such compounds. Although many studies on hydrosilylation reactions have been reported, there are no reports on vinyl polysiloxane compounds in the literature. This is because the commercial ligand-transition metal catalytic system has low reactivity and poor selectivity for alkynes and trisubstituted siloxanes, and cannot achieve multiple hydrosilylation reactions to obtain a single selective product. Therefore, the development of a catalytic system of new framework cobalt complexes and different additives is of great significance in the synthesis of new polymer monomers. Summary of the invention

[0005] The object of the present invention is to provide an alkenyl polysiloxane compound and a preparation method and application thereof, so as to solve the problem that the alkenyl siloxane fragments in the above-mentioned vinyl siloxane compound are less and the reaction activity and selectivity of the vinyl siloxane compound prepared by the hydrosilylation reaction of alkynes are poor.

[0006] To achieve the above object, the present invention provides an alkenyl polysiloxane compound in a first aspect. One molecule of the alkenyl polysiloxane compound contains two or more alkenyl siloxane fragments.

[0007] Preferably, the alkenyl polysiloxane compound is selected from one of the general formulas Ⅰ to Ⅲ, and the general formulas Ⅰ to Ⅲ are as follows:

[0008]

[0009]

[0010] Preferably, R 1 , R 3 is selected from alkyl, functionalized alkyl, R 2 is selected from optionally substituted aryl or alkyl, functionalized alkyl; R 4 , R 5 is selected from alkyl, alkoxy; R 1 , R 2 , R 3 , R 4 , R 5 It can be the same or different.

[0011] Preferably,

[0012] Alkyl is C1~C 12 The alkyl group;

[0013] The functional group in the functionalized alkyl group is selected from aryl, substituted aryl, alkenyl, halogen, acetal, ether, hydroxyl, thiol, amide or ester;

[0014] Aryl is selected from phenyl, substituted phenyl, naphthyl, thienyl or indolyl;

[0015] The alkoxy group is selected from methoxy, ethoxy or isopropoxy.

[0016] Preferably, the substituents in the substituted phenyl are selected from one or more of C1-C8 alkyl, C2-C8 acyloxy, hydroxyl, halogen, amino, (C1-C8 acyl)amino, di(C1-C8 alkyl)amino, C1-C8 acyl, C2-C8 ester, and alkyl halide; and the number of substituents is ≥1.

[0017] Preferably,

[0018] The C1-C8 alkyl group is selected from methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, sec-pentyl, tert-pentyl, n-hexyl, isohexyl, neohexyl, sec-hexyl, tert-hexyl, n-heptyl, isoheptyl, neoheptyl, sec-heptyl, tert-heptyl, n-octyl, isooctyl, neooctyl, sec-octyl or tert-octyl;

[0019] The C2-C8 acyloxy group is selected from acetyloxy, propionyloxy, n-butyryloxy, isobutyryloxy, n-valeryloxy, isovaleryloxy, secondary valeryloxy, pivaloyloxy, n-hexanoyloxy, isohexanoyloxy, neohexanoyloxy, secondary hexanoyloxy, n-heptanoyloxy, isoheptanoyloxy, neoheptanoyloxy, secondary heptanoyloxy, n-octanoyloxy, isooctanoyloxy, neooctanoyloxy, secondary octanoyloxy, 1-cyclopropylcarbonyloxy, 1-cyclobutylcarbonyloxy, 1-cyclopentylcarbonyloxy, 1-cyclohexylcarbonyloxy or 1-cycloheptylcarbonyloxy;

[0020] The C1-C8 acyl group is selected from formyl, acetyl, propionyl, n-butyryl, isobutyryl, n-valeryl, isovaleryl, sec-valeryl, pivaloyl, n-hexanoyl, isohexanoyl, neohexanoyl, sec-hexanoyl, n-heptanoyl, isoheptanoyl, neoheptanoyl, sec-heptanoyl, n-octanoyl, isooctanoyl, neooctanoyl, sec-octanoyl, 1-cyclopropylformyl, 1-cyclobutylformyl, 1-cyclopentylformyl, 1-cyclohexylformyl or 1-cycloheptylformyl;

[0021] The C2-C8 ester group is selected from methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, butoxycarbonyl, isobutoxycarbonyl, n-pentyloxycarbonyl, isopentyloxycarbonyl, neopentyloxycarbonyl, secondary pentyloxycarbonyl, tert-pentyloxycarbonyl, cyclopentyloxycarbonyl, n-hexyloxycarbonyl, isohexyloxycarbonyl, neohexyloxycarbonyl, secondary hexyloxycarbonyl, tert-hexyloxycarbonyl, cyclohexyloxycarbonyl, n-heptyloxycarbonyl, isoheptyloxycarbonyl, neoheptyloxycarbonyl, secondary heptyloxycarbonyl, tert-heptyloxycarbonyl or cycloheptyloxycarbonyl.

[0022] Preferably, the general formula I is as follows:

[0023]

[0024] The general formula II is as follows:

[0025]

[0026] The second aspect of the present invention provides a method for preparing an alkenyl polysiloxane compound, comprising the following steps:

[0027] With alkyne and trisubstituted siloxane as raw materials and cobalt complex as catalyst, the raw materials, catalyst and activation reagent are added into an organic solvent for reaction to obtain alkenyl polysiloxane compound.

[0028] Preferably, the equivalent ratio of alkyne, trisubstituted siloxane and activating agent is 1:1-4:0.01-0.2;

[0029] The amount of the catalyst added is 1 to 3 mol% of the total molar amount of the alkyne and the trisubstituted siloxane;

[0030] The reaction temperature is 25-60°C, and the reaction time is 10-40h.

[0031] Preferably, the cobalt complex is selected from L1CoCl2 or L2CoCl2, and the chemical structural formulas of L1CoCl2 and L2CoCl2 are respectively:

[0032]

[0033] Among them, Ar 1 =Ph,Ar 2 =3,5-Ph-C6H3;

[0034] The activating agent is selected from a reducing agent or an anionic salt;

[0035] The organic solvent is selected from at least one of ether, n-hexane, 1,4-dioxane, toluene and benzene.

[0036] The catalyst of the invention belongs to a cyclopropane skeleton 1,4-bisphosphorus cobalt complex.

[0037] Preferably, the reducing agent is selected from EtMgBr, i PrMgBr, MeMgBr, PhMgBr, DIBAL-H (diisobutylaluminum hydride), AlMe3, AlEt3, Al i At least one of Bu3, ZnEt2;

[0038] The anionic salt is selected from NaBAr F , NaB(PhF5)3.

[0039] The present invention has different preparation methods for alkenyl polysiloxane compounds of different general formulas, wherein the preparation method of general formula I is as follows:

[0040] In one or more organic solvents such as ether, n-hexane, 1,4-dioxane and toluene, at 25-60° C., alkyne and 1.2-2.4 equivalents of trisubstituted siloxane are used as reactants, 3-5 mol% L1CoCl2 is used as a catalyst, and 0.09-0.15 equivalents of a reducing agent is used as an activating agent. The reaction is carried out for 10-20 hours to prepare an alkenyl polysiloxane compound.

[0041] The chemical reaction equation of general formula I is as follows:

[0042]

[0043] The preparation method of general formula II is as follows:

[0044] In one or more organic solvents such as n-hexane, benzene and toluene, at 25-60° C., alkyne and 2.4 equivalents of trisubstituted siloxane are used as reactants, 1-3 mol% L2CoCl2 is used as a catalyst, and 0.02-0.06 equivalents of anionic salt is used as an activating agent. The reaction is carried out for 10-36 hours to prepare an alkenyl polysiloxane compound.

[0045] The chemical reaction equation of general formula II is as follows:

[0046]

[0047] The preparation method of general formula III is as follows:

[0048] In one or more organic solvents such as n-hexane, benzene and toluene, at 25-60° C., alkyne and 3.6 equivalents of trisubstituted siloxane are used as reactants, 1-3 mol% L2CoCl2 is used as a catalyst, and 0.02-0.06 equivalents of anionic salt is used as an activating agent. The reaction is carried out for 10-36 hours to prepare an alkenyl polysiloxane compound.

[0049] The chemical reaction equation of general formula III is as follows:

[0050]

[0051] A third aspect of the present invention provides an application of an alkenyl polysiloxane compound, and the application of the alkenyl polysiloxane compound in the fields of aerospace, construction, chemical industry, food, medical treatment and organic synthesis.

[0052] Therefore, the present invention adopts the above-mentioned alkenyl polysiloxane compound and its preparation method and application, which has the following beneficial effects:

[0053] (1) The present invention designs the structure of the alkenylsiloxane compound so that two or more alkenylsiloxane fragments are contained in one molecule, thereby improving the reactivity of organosilicon, which is of great significance for its use as a raw material for organic synthesis and application.

[0054] (2) The chemical structure of the alkenyl polysiloxane compound prepared by the present invention contains multiple silicon-oxygen bonds and carbon-carbon double bonds, so it has the potential for olefin polymerization and siloxane polymerization, and has a good application prospect in polymer modification.

[0055] (3) The present invention is directed to the preparation process of alkenyl polysiloxane compounds, uses a new framework cobalt complex as a catalyst, and utilizes multiple hydrosilylation reactions of alkynes to obtain products, thereby improving the activity and selectivity of the reaction.

[0056] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 The product 1b prepared in Example 1 1 H NMR spectra;

[0058] Figure 2 The product 1b prepared in Example 1 13 C NMR spectra;

[0059] Figure 3 The product 2b prepared in Example 1 1 H NMR spectra;

[0060] Figure 4 The product 2b prepared in Example 1 13 C NMR spectra;

[0061] Figure 5 The product 3b prepared in Example 1 1 H NMR spectra;

[0062] Figure 6 The product 3b prepared in Example 1 13 C NMR spectra;

[0063] Figure 7 The product 4b prepared in Example 1 1 H NMR spectra;

[0064] Figure 8 The product 4b prepared in Example 1 13 C NMR spectrum. DETAILED DESCRIPTION

[0065] The present invention will be further described below. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and a specific operation process, but the present invention is not limited to this embodiment.

[0066] Example 1

[0067] This embodiment provides a method for preparing an alkenyl polysiloxane compound, which mainly utilizes cobalt to catalyze the hydrosilylation reaction of an aromatic internal alkyne and a trisubstituted siloxane, and the reaction formula is as follows:

[0068]

[0069] The specific preparation process is as follows:

[0070] (1) In a glove box filled with argon, add L2CoCl2 (0.015 mmol, 3 mol%), NaBAr F (CAS: 79060-88-1) (0.01 mmol, 2 mol%) and toluene (1 mL) to obtain a reaction mixture.

[0071] (2) The reaction mixture was stirred at room temperature for 1 min, and then HSi(OEt)3 (1.8 mmol, 3.6 equiv) and alkyne 1a (CAS: 1100393-59-6) (0.5 mmol) were added in sequence.

[0072] (3) After stirring at room temperature for a specified time of 36 h, the sealed tube was taken out of the glove box and the reaction mixture was filtered through a short silica gel column (PE / EA=10:1). The filtrate was concentrated by rotary evaporation and the crude product was purified by column chromatography to obtain the target product 1b.

[0073] The chemical formula of L2CoCl2 is:

[0074]

[0075] Ar 1 =Ph,Ar 2 =3,5-Ph-C6H3.

[0076] The L2CoCl2 compound was synthesized according to the literature method (ZL202111112863.4).

[0077] The chemical structure of 1,3,5-tri((E)-2-(triethoxysilyl)-1-en-1-propyl)benzene (1b) is as follows:

[0078]

[0079] Colorless liquid, 247 mg, yield 72%, 95:5 rr.

[0080] The characterization data of product 1b are as follows:

[0081] 1 H NMR (400MHz, CDCl3) δ7.19 (s, 3H), 7.06 (d, J = 1.9Hz, 3H), 3.89 (q, J = 7.0Hz, 18H), 2.00 (d, J = 1.8Hz, 9H), 1.27 (t, J = 7.0Hz, 27H).

[0082] 13C NMR (101MHz, CDCl3) δ142.01,137.42,131.25,128.75,58.73,18.35,16.36.

[0083] HRMS (ESI) calculation for [M+H,C 33 H 61 O9Si3] + :685.3618, found 685.3605.

[0084] Example 2

[0085] The synthesis method of the alkenyl polysiloxane compound in this embodiment is the same as that in Example 1, and the reaction formula is as follows:

[0086]

[0087] The specific preparation process is as follows:

[0088] (1) In a glove box filled with argon, add L2CoCl2 (0.015 mmol, 3 mol%), NaBAr F (CAS: 79060-88-1) (0.01 mmol, 2 mol%) and toluene (1 mL) to obtain a reaction mixture.

[0089] (2) The reaction mixture was stirred at room temperature for 1 min, and then HSi(OEt)3 (1.2 mmol, 2.4 equiv) and alkyne 2a (CAS: 105058-42-2) (0.5 mmol) were added in sequence.

[0090] (3) After stirring at room temperature for a specified time of 12 h, the sealed tube was taken out of the glove box and the reaction mixture was filtered through a short silica gel column (PE / EA=10:1). The filtrate was concentrated by rotary evaporation and the crude product was purified by column chromatography to obtain the target product 2b.

[0091] The chemical formula of L2CoCl2 is:

[0092]

[0093] Ar 1 =Ph,Ar 2 =3,5-Ph-C6H3.

[0094] The L2CoCl2 compound was synthesized according to the literature method (ZL202111112863.4).

[0095] The chemical structure of 1,4-bis((E)-2-(triethoxysilyl)-1-en-1-propyl)benzene (2b) is as follows:

[0096]

[0097] Colorless liquid, 215 mg, yield 89%, >98:2rr.

[0098] The characterization data of product 2b are as follows:

[0099] 1 H NMR (400MHz, CDCl3) δ7.34 (s, 4H), 7.05 (q, J = 1.8Hz, 2H), 3.89 (q, J = 7.0Hz, 12H), 2.02 (d, J = 1.8Hz, 6H), 1.27 (t, J = 7.0Hz, 18H).

[0100] 13 C NMR (101MHz, CDCl3) δ141.73,136.54,131.04,129.05,58.65,18.28,16.33.

[0101] HRMS (ESI) calculation for [M+H,C 24 H 43 O6Si2] + :483.2593,found483.2584.

[0102] Example 3

[0103] This embodiment provides a method for preparing an alkenyl polysiloxane compound, which mainly utilizes cobalt to catalyze the hydrosilylation reaction of silicon-based internal alkynes and trisubstituted siloxanes, and the reaction formula is as follows:

[0104]

[0105] The specific preparation process is as follows:

[0106] (1) In a glove box filled with argon, L1CoCl2 (0.015 mmol, 3 mol%), toluene (2 mL) and AlEt3 (0.045 mmol, 9 mol%) were added to a 10 mL sealed tube to obtain a reaction mixture.

[0107] (2) The reaction mixture was stirred at room temperature for 1 min, and then HSi(OEt)3 (1.2 mmol, 2.4 equiv) and alkyne 3a (CAS: 75405-43-5) (0.5 mmol) were added in sequence.

[0108] (3) After stirring at room temperature for a specified time of 20 h, the sealed tube was taken out of the glove box and the reaction mixture was filtered through a short silica gel column (PE / EA=10:1). The filtrate was concentrated by rotary evaporation and the crude product was purified by silica gel column chromatography to obtain the target product 3b.

[0109] The chemical formula of L1CoCl2 is:

[0110]

[0111] The L1CoCl2 compound was synthesized according to the literature method (ZL202111112863.4).

[0112] The chemical structure of (5E,8E)-4,4,10,10-tetraethoxy-5,7,7,9-tetramethyl-3,11-dioxo-4,7,10-trimethylsilantridecane-5,8-diene (3b) is as follows:

[0113]

[0114] Colorless liquid, 196 mg, yield 84%, >98:2rr.

[0115] The characterization data of product 3b are as follows:

[0116] 1 H NMR (400MHz, CDCl3) δ6.47(q,J=1.5Hz,2H),3.81(q,J=7.0Hz,12H),1.90(d,J=1.5Hz,6H),1.22(t,J=7.0Hz,18H),0.26(s,6H).

[0117] 13 C NMR (101MHz, CDCl3) δ150.97,146.50,58.56,21.34,18.26,-0.43.

[0118] HRMS (ESI) calculation for [M+H,C 20 H 45 O6Si3] + :465.2518,found465.2512.

[0119] Example 4

[0120] The synthesis method of the alkenyl polysiloxane compound in this embodiment is the same as that in Example 3, and the reaction formula is as follows:

[0121]

[0122] The specific preparation process is as follows:

[0123] (1) In a glove box filled with argon, L1CoCl2 (0.015 mmol, 3 mol%), toluene (2 mL) and AlEt3 (0.045 mmol, 9 mol%) were added to a 10 mL sealed tube to obtain a reaction mixture.

[0124] (2) The reaction mixture was stirred at room temperature for 1 min, and then HSi(OEt)3 (1.2 mmol, 2.4 equiv) and alkyne 4a (CAS: 104584-84-1) (0.5 mmol) were added in sequence.

[0125] (3) After stirring at room temperature for a specified time of 20 h, the sealed tube was taken out of the glove box and the reaction mixture was filtered through a short silica gel column (PE / EA=10:1). The filtrate was concentrated by rotary evaporation and the crude product was purified by silica gel column chromatography to obtain the target product 4b.

[0126] The chemical formula of L1CoCl2 is:

[0127]

[0128] The L1CoCl2 compound was synthesized according to the literature method (ZL202111112863.4).

[0129] The chemical structure of (5E,8E)-4,4,10,10-tetraethoxy-5,9-dimethyl-7,7-diphenyl-3,11-dioxo-4,7,10-trimethylsilantridecane-5,8-diene (4b) is as follows:

[0130]

[0131] Colorless liquid, 176 mg, yield 60%, >98:2rr.

[0132] The characterization data of product 4b are as follows:

[0133] 1 H NMR (400MHz, CDCl3) δ7.60-7.55(m,4H),7.38-7.30(m,6H),6.84(q,J=1.5Hz ,2H),3.84(q,J=7.0Hz,12H),1.84(d,J=1.5Hz,6H),1.23(t,J=7.0Hz,18H).

[0134] 13C NMR (101MHz, CDCl3) δ155.12,142.01,136.41,135.09,129.22,128.02,58.72,22.63,18.36.

[0135] HRMS (ESI) calculation for [M+H,C 30 H 49 O6Si3] + :589.2831, found 589.2821.

[0136] The alkenyl siloxane compounds prepared in the above examples all contain two or more alkenyl siloxane fragments and have the ability to polymerize olefins and siloxanes, which is very important for polymer modification. There are many specific applications, and the published literature is as follows:

[0137] (a) Ghobadifar, V.; Marandi, GB; Kurdtabar, M.; Bardajee, GRRemoval of Pb(II) and Cd(II) by MnFe2O4@SiO2@VTMS nanocomposite hydrogel from aqueoussolutions.J.Polym.Environ.2023,31,2686-2704.

[0138] (b) Abd El-Ghaffar, MA; Sherif, MH; Taher El-Habab, A. Novel high solidcontent nano siliconated poly(VeoVa-acrylate)terpolymer latex for high performance latex paints. Chem. Engin. J. 2016, 301, 285-298.

[0139] (c)Bhuwania, N.;Labreche,Y.;Achoundong,CSK;Baltazar,J.;Burgess,SK;Karwa,S.;Xu,L.-R.;Henderson,CL;Williams,PJ;Koros,WJ

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An alkenyl polysiloxane compound, characterized in that: One alkenyl polysiloxane compound molecule contains two or more alkenyl siloxane segments.

2. An alkenyl polysiloxane compound according to claim 1, characterized in that: The alkenyl polysiloxane compound is selected from one of the general formulas Ⅰ to Ⅲ, and the general formulas Ⅰ to Ⅲ are as follows:

3. An alkenyl polysiloxane compound according to claim 2, characterized in that: R 1 , R 3 is selected from alkyl, functionalized alkyl, R 2 is selected from optionally substituted aryl or alkyl, functionalized alkyl; R 4 , R 5 is selected from alkyl, alkoxy; R 1 , R 2 , R 3 , R 4 , R 5 It can be the same or different.

4. An alkenyl polysiloxane compound according to claim 3, characterized in that: Alkyl is C1~C 12 The alkyl group; The functional group in the functionalized alkyl group is selected from aryl, substituted aryl, alkenyl, halogen, acetal, ether, hydroxyl, thiol, amide or ester; Aryl is selected from phenyl, substituted phenyl, naphthyl, thienyl or indolyl; The alkoxy group is selected from methoxy, ethoxy or isopropoxy.

5. An alkenyl polysiloxane compound according to claim 4, characterized in that: The substituents in the substituted phenyl group are selected from one or more of C1-C8 alkyl, C2-C8 acyloxy, hydroxy, halogen, amino, (C1-C8 acyl)amino, di(C1-C8 alkyl)amino, C1-C8 acyl, C2-C8 ester, and alkyl halide; the number of substituents is ≥1.

6. An alkenyl polysiloxane compound according to claim 5, characterized in that: The C1-C8 alkyl group is selected from methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, sec-pentyl, tert-pentyl, n-hexyl, isohexyl, neohexyl, sec-hexyl, tert-hexyl, n-heptyl, isoheptyl, neoheptyl, sec-heptyl, tert-heptyl, n-octyl, isooctyl, neooctyl, sec-octyl or tert-octyl; The C2-C8 acyloxy group is selected from acetyloxy, propionyloxy, n-butyryloxy, isobutyryloxy, n-valeryloxy, isovaleryloxy, secondary valeryloxy, pivaloyloxy, n-hexanoyloxy, isohexanoyloxy, neohexanoyloxy, secondary hexanoyloxy, n-heptanoyloxy, isoheptanoyloxy, neoheptanoyloxy, secondary heptanoyloxy, n-octanoyloxy, isooctanoyloxy, neooctanoyloxy, secondary octanoyloxy, 1-cyclopropylcarbonyloxy, 1-cyclobutylcarbonyloxy, 1-cyclopentylcarbonyloxy, 1-cyclohexylcarbonyloxy or 1-cycloheptylcarbonyloxy; The C1-C8 acyl group is selected from formyl, acetyl, propionyl, n-butyryl, isobutyryl, n-valeryl, isovaleryl, sec-valeryl, pivaloyl, n-hexanoyl, isohexanoyl, neohexanoyl, sec-hexanoyl, n-heptanoyl, isoheptanoyl, neoheptanoyl, sec-heptanoyl, n-octanoyl, isooctanoyl, neooctanoyl, sec-octanoyl, 1-cyclopropylformyl, 1-cyclobutylformyl, 1-cyclopentylformyl, 1-cyclohexylformyl or 1-cycloheptylformyl; The C2-C8 ester group is selected from methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, butoxycarbonyl, isobutoxycarbonyl, n-pentyloxycarbonyl, isopentyloxycarbonyl, neopentyloxycarbonyl, secondary pentyloxycarbonyl, tert-pentyloxycarbonyl, cyclopentyloxycarbonyl, n-hexyloxycarbonyl, isohexyloxycarbonyl, neohexyloxycarbonyl, secondary hexyloxycarbonyl, tert-hexyloxycarbonyl, cyclohexyloxycarbonyl, n-heptyloxycarbonyl, isoheptyloxycarbonyl, neoheptyloxycarbonyl, secondary heptyloxycarbonyl, tert-heptyloxycarbonyl or cycloheptyloxycarbonyl.

7. A method for preparing an alkenyl polysiloxane compound according to any one of claims 1 to 6, characterized in that: The following steps are involved: With alkyne and trisubstituted siloxane as raw materials and cobalt complex as catalyst, the raw materials, catalyst and activation reagent are added into an organic solvent for reaction to obtain alkenyl polysiloxane compound.

8. The method for preparing an alkenyl polysiloxane compound according to claim 7, characterized in that: The equivalent ratio of alkyne, trisubstituted siloxane and activating agent is 1:1-4:0.01-0.2; The amount of the catalyst added is 1 to 3 mol% of the total molar amount of the alkyne and the trisubstituted siloxane; The reaction temperature is 25-60°C, and the reaction time is 10-40h.

9. The method for preparing an alkenyl polysiloxane compound according to claim 7, characterized in that: The cobalt complex is selected from L1CoCl2 or L2CoCl2, and the chemical structural formulas of L1CoCl2 and L2CoCl2 are respectively: Among them, Ar 1 =Ph,Ar 2 =3,5-Ph-C6H3; The activating agent is selected from a reducing agent or an anionic salt; The organic solvent is selected from at least one of ether, n-hexane, 1,4-dioxane, toluene and benzene.

10. The use of an alkenyl polysiloxane compound according to any one of claims 1 to 6, characterized in that: Applications of alkenyl polysiloxane compounds in aerospace, construction, chemical, food, medical and organic synthesis.

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