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Method for synthesis of 2,3-octadione monoxime

A technology of octanedione monoxime and a synthetic method, which is applied in two fields, can solve the problems of low product yield, and achieve the effects of high reaction yield, easy operation, and fast reaction speed

Inactive Publication Date: 2007-05-16
上海香料研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 2,3-octanedione monoxime obtained by the usual method has a low product yield

Method used

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  • Method for synthesis of 2,3-octadione monoxime

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Experimental program
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Embodiment Construction

[0007] The implementation of the present invention will be further described below.

[0008] Add 166 grams (1.3mol) of 2-octanone and 12 milliliters of dilute hydrochloric acid into a 500ml round-bottomed three-neck flask equipped with a stirrer, dropping funnel, and thermometer, and start to drop 200 grams (1.7mol) of nitrous acid under cooling. For isoamyl ester, continue to stir for 2 hours after dropping, and keep the temperature between 40-50°C throughout. The reaction yield was 78.8%. And 2,3-octanedione monoxime is an important intermediate for the synthesis of 2,3-octanedione.

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Abstract

The invention discloses a synthesizing method of cinchodiketone monooxime, which comprises the following steps: adopting 2-octanone as raw material; setting the molar rate of 2-heptanone and amyl nitrite at 1: 0.6-1: 3; dripping amyl nitrite in the condition of dilute alcaine as raw material to react at 20-100 Deg C for 2-10h.

Description

technical field [0001] The invention relates to a synthesis method of 2,3-octanedione monoxime. Background technique [0002] 2,3-octanedione has a sweet and creamy aroma, and is mainly used in coffee, tobacco, baked food, and dairy products. The 2,3-octanedionoxime obtained by the usual method has a low product yield. Contents of the invention [0003] Aiming at the shortcomings of the prior art, the invention provides a method for synthesizing 2,3-octanedione monoxime with higher yield. [0004] The synthesis method of 2,3-octanedione monoxime of the present invention: use 2-octanone as raw material, in the presence of dilute hydrochloric acid, drop isoamyl nitrite and make it, the reaction temperature is 20-100°C, and the reaction time is 2 -10 hours, the molar ratio of octanone to isoamyl nitrite is 1:0.6 to 1:3, and the catalyst used in the reaction is dilute hydrochloric acid. Its reaction formula is as follows: [0005] [0006] The invention has the advantag...

Claims

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Application Information

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IPC IPC(8): C07C251/38C07C249/04
Inventor 何锡敏黄亚文陶骅
Owner 上海香料研究所