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A kind of si-o-si chain bridged n-heterocyclic carbene platinum complex and its preparation method and application

A technology of si-o-si and complexes, which is applied in the direction of platinum organic compounds, platinum group organic compounds, compounds of group 4/14 elements of the periodic table, etc., to achieve easy separation, design, high selectivity, and compatibility good sex effect

Active Publication Date: 2019-03-29
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalysts for hydrosilylation reactions continue to develop, and the existing carbene catalysts mostly use carbon-carbon and carbon-hydrogen compounds as the main framework to form carbene complexes; however, there are coordination metal platinum catalysts in olefin hydrosilylation reactions Compatibility issues with reaction substrates

Method used

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  • A kind of si-o-si chain bridged n-heterocyclic carbene platinum complex and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add 6.2g of butylimidazole and 5.0g of 1,3-dichloromethyltetramethylsiloxane (molar ratio 2:1) into a 250mL three-necked flask and add it to a flask equipped with magnetic stirring, heating and condensing In the reactor, add toluene as a solvent, stir and react at 110° C. for 24 h, separate and purify to obtain the [Si-O-Si] chain-bridged carbene precursor.

[0024] (2) Take 2.74g (0.005mol) of the above-mentioned ionic liquid, 1.68g (0.015mol) of potassium tert-butoxide, and 50mL of anhydrous tetrahydrofuran as a solvent. After reacting for 1h under the protection of nitrogen, add 9.75g of Karstedt's catalyst (Pt content 1.95g , 0.01mol), stirred at room temperature for 72h, separated and purified to obtain [Si-O-Si] chain-bridged N-heterocyclic carbene platinum (0) complex 1.

Embodiment 2

[0026] Using the method in Example 1, butylimidazole is replaced with phenylimidazole in step (1), the molar ratio of phenylimidazole to 5.0 g of 1,3-dichloromethyltetramethylsiloxane is 2:1, and Add toluene as a solvent into a reactor equipped with magnetic stirring, heating device and condensing device, stir and react at 120°C for 12 hours, separate and purify to obtain [Si-O-Si] chain-bridged carbene precursor. Step (2) prepare Si-O-Si] chain bridged N-heterocyclic carbene platinum (0) complex 2.

Embodiment 3

[0028] Adopt the method among the embodiment 1, in step (1), replace butylimidazole with 2,4,6-trimethylphenylimidazole, make the N-heterocyclic carbene platinum of Si-O-Si] chain bridging ( 0) Complex 3.

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Abstract

The invention provides a [Si-O-Si] chain-bridged N-heterocyclic carbine platinum complex and a preparation method thereof to improve intermiscibility of a coordinated metal platinum catalyst with a reaction substrate in hydrosilation of olefin, belonging to the field of organic chemistry. The preparation method comprises the following steps: reacting imidazole with chloromethyl-terminated siloxane so as to obtain imidazole type ionic liquid and subjecting the obtained ionic liquid and a metal complex to an in-situ reaction under the action of potassium tert-butanolate so as to produce the [Si-O-Si] chain-bridged N-heterocyclic carbine platinum complex. The special composition and structure of the complex is favorable for improving the activity, selectivity and stability of a catalyst, and the catalyst can be easily separated from a product for recycling.

Description

technical field [0001] The invention relates to the field of organic chemistry, in particular to a Si-O-Si chain bridged N-heterocyclic carbene platinum complex and a preparation method thereof. Background technique [0002] Catalysts used in hydrosilylation reactions are mainly transition metals and metal salts, especially platinum group metals. More effective catalysts have developed from the initial Pt / C catalyst and Speier's catalyst to the later more efficient Karstedt's catalyst, and the catalytic activity has been greatly improved. A large number of phosphine, nitrogen, sulfur and other compounds have also appeared as ligands for platinum-catalyzed hydrosilylation chemical reactions, which have improved the catalytic performance of platinum catalysts to a certain extent. Catalysts for hydrosilylation reactions continue to develop, and most of the existing carbene catalysts use carbon-carbon and carbon-hydrogen compounds as the main framework to form carbene complexes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F15/00B01J31/22C07F7/18
CPCB01J31/2273B01J31/2278B01J2231/32B01J2523/828C07F7/1804C07F7/1876C07F15/0086
Inventor 白赢彭家建张凤香杨晓玲厉嘉云肖文军
Owner HANGZHOU NORMAL UNIVERSITY