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Supported borane catalyst

A catalyst and supported technology, which is applied in the field of supported borane catalysts, can solve the problems of unrecoverable catalysts, less research reports on Lewis acid borane loading, easy loss of active component borane, etc.

Active Publication Date: 2018-07-27
LESHAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the catalyst cannot be recovered in the homogeneous reaction, the reaction cost is high and the post-treatment is complicated.
At present, there are many studies on the loading method of heterogeneous catalysts, but there are few reports on the loading of Lewis acid borane
The borane loading agents studied in the literature mainly use silica or modified silica as the carrier, but they all have the disadvantages of low loading efficiency and easy loss of the active component borane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Mix 10.2mg of amine-modified polystyrene (average amine content is 3.0mmol / g) and 5mg of B(C 6 f 5 ) 3 Add 2mL of chloroform, shake well, soak at room temperature for 12 hours, filter and wash with chloroform, and dry to obtain amino-modified polystyrene loaded B(C 6 f 5 ) 3 Catalyst, take the mass of catalyst as 100%, B(C 6 f 5 ) 3 The loading is 32.90%.

Embodiment 2

[0014] 10.0mg triphenylphosphine resin (the average content of phosphine is 10.0mmol / g) and 5mg B(C 6 f 5 ) 3 Add 2mL of chloroform, shake well, soak at room temperature for 12 hours, filter and wash with chloroform, and dry to obtain triphenylphosphine resin-loaded B(C 6 f 5 ) 3 Catalyst, take the mass of catalyst as 100%, B(C 6 f 5 ) 3 The loading is 33.33%.

Embodiment 3

[0016] Mix 15.0mg of amine-modified polystyrene (the average content of amine group is 3.0mmol / g) and 5mg of B(C 6 f 5 ) 3 Add into 3mL of dichloromethane, shake well, soak at room temperature for 12 hours, filter and wash with dichloromethane, and dry to obtain amino-modified polystyrene loaded B(C 6 f 5 ) 3 Catalyst, take the mass of catalyst as 100%, B(C 6 f 5 ) 3 The loading amount is 25%.

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PUM

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Abstract

The invention discloses a supported borane catalyst. The catalyst uses borane as an active component and uses modified polystyrene containing a Lewis basic group as a carrier, the active component andthe Lewis basic group on the carrier are subjected to complexing, and the active component is dispersed on the surface of the carrier, wherein based on 100% by mass of the catalyst, a loading amountof the active component is 10%-50%, and the borane is tris(pentafluorophenyl)boron, tris(tetrafluorophenyl)boron, tris(trifluorophenyl)boron, tris(difluorophenyl)boron, tris(fluorophenyl)boron or triphenylboron, and the modified polystyrene containing the Lewis basic group is amine modified polystyrene or triphenylphosphine resin. The catalyst disclosed by the invention can be used in catalysis ofcomplete reduction of an aromatic aldehyde or an aromatic ketone to prepare an alkane, partial reduction to prepare an alcohol or an ether, direct reductive amination with an amine, and a reduction reaction with an amine intermediate imine, and has catalytic activity, selectivity and catalyst reusability which are significantly better than those of a homogeneous catalytic system and a silicon-based silicon dioxide carrier system.

Description

technical field [0001] The invention belongs to the technical field of heterogeneous catalysis, and in particular relates to a supported borane catalyst for catalytic reduction of aromatic aldehydes or aromatic ketones. Background technique [0002] The reduction reaction of aldehydes and ketones is an important class of reactions, and has important applications in the fields of organic synthesis, petrochemicals, fine chemicals and pharmaceuticals. There are a lot of reports on the non-metallic catalyst Lewis acid borane in the hydrogenation reduction of aldehydes and ketones. However, since the catalyst cannot be recovered in the homogeneous reaction, the reaction cost is high and the post-treatment is complicated. At present, there are many studies on the loading methods of heterogeneous catalysts, but there are few reports on the loading of Lewis acid boranes. The borane loading agents studied in the literature mainly use silica or modified silica as the carrier, but th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/14C07C15/16C07C15/073C07C1/22C07C43/205C07C41/18C07C33/46C07C29/14C07C211/48C07C209/28C07F7/18
CPCB01J31/146B01J2231/643C07C1/22C07C29/14C07C41/18C07C209/28C07C2531/14C07F7/188C07C15/16C07C15/073C07C43/205C07C33/46C07C211/48
Inventor 聂万丽张洁温志国鲍尔佐夫·马克西姆杨青青林玥唐红梅
Owner LESHAN NORMAL UNIV