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Catalyst for hotrienol rearrangement reaction for citral preparation and method

A technology for dehydrolinalool and citral, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the problem of long reaction time, molybdenum catalyst activity It is not high, the catalyst price is relatively expensive, etc., to achieve the effect of high activity and selectivity, mild reaction conditions, and low dosage

Inactive Publication Date: 2016-02-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activity of molybdenum-based catalysts is not high, the reaction time is long, and the catalyst price is relatively expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 30g (197.07mmol) of dehydrolinalool and 30g of solvent toluene into a 100mL three-necked flask equipped with a thermometer, a stirrer and a condenser; 0.96g (3.4mmol) of isopropyl titanate, 0.18g (1.82mmol) of cuprous chloride and 3g (22.03mmol) of p-toluic acid, and keep the constant temperature in the reactor until the end of the reaction. The reaction solution is analyzed by gas chromatography, with benzyl alcohol as the internal standard, and the concentration of each component in the reaction solution is calculated by the internal standard method, thereby calculating the conversion rate of dehydrolinalool and the yield of citral. The reaction results are listed in Table 1.

[0024] Table 1

[0025] Response time / hour

Embodiment 2

[0027] Reduce solvent toluene consumption to 15g, other raw material proportioning and reaction conditions are identical with embodiment 1, and reaction result is listed in table 2.

[0028] Table 2

[0029] Response time / hour

Embodiment 3

[0031] 30 g of solvent 1,2-dichlorobenzene was used, and the ratio of other raw materials and reaction conditions were the same as in Example 1. The reaction results are listed in Table 3.

[0032] table 3

[0033] Response time / hour

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PUM

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Abstract

The invention provides a combined catalyst for a hotrienol rearrangement reaction for citral preparation. The catalyst is a combination of titanium tetraisopropanolate and cuprous chloride. The invention further provides a method for preparing citral through the hotrienol rearrangement reaction which adopts the catalyst combining titanium tetraisopropanolate and cuprous chloride. The catalyst is relatively high in both activity and selectivity, low in price, easy to obtain, low in dosage and very mild in reaction condition; within a relatively short reaction time, the ideal conversion rate and yield of a target product can be obtained.

Description

technical field [0001] The invention relates to a catalyst and a catalytic reaction method for preparing citral by directly performing a rearrangement reaction with dehydrolinalool as a raw material. Background technique [0002] Citral is a colorless or slightly yellowish liquid with a strong lemon flavor, which can be used to make citrus-flavored food flavors, directly used in beverages and food processing. As one of the most important open-chain monoterpenes, citral is a fine chemical intermediate with broad application prospects. It can be used to synthesize isopulegol, hydroxycitronellal and ionone, and can also be converted into vitamin E, Important starting material for Vitamin A, Isophytol or β-Genone. [0003] Natural citral exists in plant essential oils such as litsea cubeba oil, maple grass oil, lemongrass oil, eucalyptus oil, grass oil, lemon basil oil, etc. Domestic citral products are mainly extracted from plant essential oils, which are limited by raw materi...

Claims

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Application Information

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IPC IPC(8): B01J31/30C07C45/51C07C47/21
Inventor 朱志庆赵宁波韦存茜陈卓君周卫东卢浩然
Owner EAST CHINA UNIV OF SCI & TECH
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