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Use of lithium diisopropyl amido in 1-methyl cyclopropene preparation

A technology of methylcyclopropene and diisopropylamino, applied in the field of chemical synthesis, can solve the problems such as the application of lithium diisopropylamide which has not been reported, achieves reduction of production cost, and solves the problems of high energy consumption and high yield. Effect

Active Publication Date: 2009-07-22
LINHAI LIANSHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as the application in the preparation of benzyl isoeugenol, thiophene macrocyclic compounds and their derivatives, 3-amino-2-enimine, β-aminonitrile compounds, but the prior art has never reported diisopropyl Application of Lithium Amide in Preparation of 1-Methylcyclopropene

Method used

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  • Use of lithium diisopropyl amido in 1-methyl cyclopropene preparation
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  • Use of lithium diisopropyl amido in 1-methyl cyclopropene preparation

Examples

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Embodiment 1

[0022] Embodiment 1: Preparation lithium diisopropylamide

[0023] Add 170g of diisopropylamine and 12g of metal lithium into 300ml of tetrahydrofuran, and slowly add 95g of styrene dropwise at 37°C. As the drop continues, the reaction system begins to heat up, and the temperature rises to 56°C. At this time, the reaction system is gray. Afterwards, the temperature was lowered, and the temperature was kept constant at 37°C. Stirring was continued, and lithium diisopropylamide was formed after 6 hours of reaction.

Embodiment 2

[0026] Embodiment 2: Preparation lithium diisopropylamide

[0027] Add 170g of diisopropylamine and 12g of metal lithium into 300ml of anhydrous ether. At 37°C, slowly add 95g of tetramethylethylenediamine dropwise. As the addition continues, the temperature of the reaction system begins to rise to 56°C. At this time, the reaction system was gray, and then began to lower the temperature, kept at 37°C, and continued to stir. After 4 hours of reaction, lithium diisopropylamide was formed.

Embodiment 3

[0030] Embodiment 3: Preparation lithium diisopropylamide

[0031] Add 180g of diisopropylamine and 10g of lithium metal into 350ml of tetrahydrofuran. At 20°C, slowly add 105g of styrene dropwise. As the addition continues, the reaction system begins to heat up to 45°C. At this time, the reaction system is gray. Afterwards, start to lower the temperature, keep 20°C, continue to stir, and generate lithium diisopropylamide after reacting for 8 hours.

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Abstract

The invention relates to the application of lithium diisopropylamide which is an organic alkali in preparing 1-methylcyclopropene; the application of the lithium diisopropylamide as a catalyst to prepare the 1-methylcyclopropene well solves the technical problem that the production course of the 1-methylcyclopropene has high energy consumption, low content and high cost, simplifies the production processes, reduces the production costs and realizes high yield of 1-methylcyclopropene.

Description

technical field [0001] The present invention relates to the application of a kind of organic strong base in the preparation of 1-methylcyclopropene, in particular to the application of a kind of organic strong base lithium diisopropylamide in the preparation of 1-methylcyclopropene; The field of synthetic technology. Background technique [0002] 1-Methylcyclopropene (1-MCP) is a novel plant growth regulator discovered recently, which can effectively inhibit the effects of endogenous and exogenous ethylene on plants, and delay the senescence and shedding of plant organs induced by ethylene. Because of its non-toxic, low-quantity, high-efficiency and other advantages, it can strongly block the physiological effects of endogenous ethylene, so it has broad development prospects in the storage and preservation of fruits. [0003] For the synthesis of 1-methylcyclopropene, the existing process mainly uses 2-methylchloropropene as the basic raw material, and prepares 1 through ri...

Claims

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Application Information

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IPC IPC(8): C07F1/02B01J31/12C07C13/04C07C5/44A01P21/00
Inventor 邓一建黄卫国
Owner LINHAI LIANSHENG CHEM
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