Method for preparation of aromatic alcohol by photocatalysis of aromatic aldehyde conversion

A technology for aromatic aldehydes and aromatic alcohols, applied in the field of photocatalytic asymmetric synthesis, can solve the problems of limited raw materials, high cost, harsh reaction conditions, etc., and achieve the effects of short reaction cycle, high conversion rate and low cost

Active Publication Date: 2020-04-07
SUZHOU UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The main methods of traditional preparation of aromatic alcohols are: 1. extraction from natural vegetable oil, but the raw materials of this method are limited;

Method used

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  • Method for preparation of aromatic alcohol by photocatalysis of aromatic aldehyde conversion

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Experimental program
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Effect test

Embodiment 1

[0021] The present embodiment provides a kind of photocatalytic aromatic aldehyde conversion and prepares the method for aromatic alcohol, and it comprises the following steps:

[0022] (a) Mix 5mg / mL titanium dioxide photocatalyst (P25, commercially available, Degussa), 10mmol benzaldehyde and 2mL methanol evenly, and disperse for 30min by ultrasonic (power 80W) to obtain a suspension;

[0023] (b) The dispersed suspension is irradiated by LED lamps simulating sunlight (the wavelength of light is 365nm, and the light power is 2.0W / cm 2 ) and nitrogen protection, stirred at room temperature and reacted for 2h to obtain a reactant solution (containing benzyl alcohol, the reactant solution was tested by gas chromatography to obtain figure 1 As shown in the collection of illustrative plates, it can be seen that the benzaldehyde peak at 5.3min cannot be observed substantially; that is, the conversion rate of benzaldehyde is 100%);

[0024] (c) reactant solution is extracted (get ...

Embodiment 2

[0026] The present embodiment provides a kind of photocatalytic aromatic aldehyde conversion and prepares the method for aromatic alcohol, and it is basically consistent with embodiment 1, and difference is: in step (a), photocatalyst is acid treatment (specifically: the 0.5 g P25 was dispersed in 50mL of deionized water, 1mL of nitric acid was added dropwise to the above solution, and then the solution system was placed in an ultrasonic cleaner with an electric power of 100W for 1h, taken out and centrifuged and washed twice with deionized water and ethanol respectively. Acid-treated P25); the conversion rate of final benzaldehyde is 100%, and the selectivity of benzyl alcohol is 87.7%.

Embodiment 3

[0028] The present embodiment provides a kind of photocatalytic aromatic aldehyde conversion and prepares the method for aromatic alcohol, and it is basically consistent with embodiment 1, difference is: in step (a), photocatalyst is Ag / P25 composite catalyst (Ag accounts for composite catalyst The ratio is 1wt%); The final conversion rate of benzaldehyde is 100%, and the selectivity of benzyl alcohol is 87.8%.

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Abstract

The invention relates to a method for preparation of aromatic alcohol by photocatalysis of aromatic aldehyde conversion. By means of a photocatalyst, under the conditions of illumination and inert gas, fatty alcohol is adopted as a proton donor for reduction reaction on aromatic aldehyde to obtain corresponding aromatic alcohol. Fatty alcohol is used as the proton donor, and light energy is used as the energy source to promote high-conversion-rate and high-selectivity synthesis of a series of aromatic alcohol compounds from aromatic aldehyde, the method has universal applicability, and is expected to realize industrial production; and the reaction process is green and environment-friendly, low in cost, easy to operate, short in reaction period, high in conversion rate and good in selectivity.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic asymmetric synthesis, and in particular relates to a method for photocatalytically converting aromatic aldehydes to prepare aromatic alcohols. Background technique [0002] Aromatic alcohol is a very useful raw material in organic synthesis. It is an important intermediate for the synthesis of medicines, pesticides, spices, etc., and is also the main raw material for the preparation of vitamins A, E, and K. It is widely used in medicine, spices, and fine chemicals. The main methods of traditional preparation of aromatic alcohols are: 1. extraction from natural vegetable oil, but the raw materials of this method are limited; 2. preparation by reduction of lithium aluminum hydride, hydroxymercuration, etc., but such methods are costly and the reaction conditions are harsh . [0003] Photocatalysis is a green synthesis method. Due to the advantages of mild reaction conditions, no need to use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/14C07C33/22C07C33/46C07C33/18C07C33/26C07C33/30C07C33/24C07C213/00C07C215/68
CPCC07C29/14C07C213/00C07C33/22C07C33/46C07C33/18C07C33/26C07C33/30C07C33/24C07C215/68
Inventor 刘炜烽乔玮苏韧
Owner SUZHOU UNIV
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