DK474282A - METHOD OF PREPARING HETEROCYCLIC COMPOUND - Google Patents

METHOD OF PREPARING HETEROCYCLIC COMPOUND Download PDF

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Publication number
DK474282A
DK474282A DK474282A DK474282A DK474282A DK 474282 A DK474282 A DK 474282A DK 474282 A DK474282 A DK 474282A DK 474282 A DK474282 A DK 474282A DK 474282 A DK474282 A DK 474282A
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DK
Denmark
Prior art keywords
mixture
reaction
acid
isoxazolol
diketene
Prior art date
Application number
DK474282A
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Danish (da)
Other versions
DK149649C (en
DK149649B (en
Inventor
Niels Jacobsen
Hans Kolind-Andersen
Original Assignee
Cheminova As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cheminova As filed Critical Cheminova As
Priority to DK474282A priority Critical patent/DK149649C/en
Priority to DK319283A priority patent/DK150615C/en
Priority to JP50346883A priority patent/JPS59501907A/en
Priority to PCT/DK1983/000097 priority patent/WO1984001774A1/en
Priority to EP19830903381 priority patent/EP0125253A1/en
Publication of DK474282A publication Critical patent/DK474282A/en
Publication of DK149649B publication Critical patent/DK149649B/en
Application granted granted Critical
Publication of DK149649C publication Critical patent/DK149649C/en

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  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)

Abstract

5-Methyl-3-isoxazolol is prepared by adding a diketene or an ester of acetoacetic acid to an aqueous alkaline solution of hydroxylamine having a pH in the range 8-12, with care being taken to ensure that rapid mixing takes place in the alkaline solution and that the pH of the mixture is kept within the given range during the reaction and that the temperature of the mixture is kept below approx. 30degreeC, and, after the reaction of the hydroxylamine with the diketene or the acetoacetic ester has come to an end, mixing the reaction mixture rapidly with an excess of aqueous acid, with a strongly acid mixture being obtained, such that 5-methyl-3-isoxazolol is formed as the predominant reaction product, after which this product is isolated.
DK474282A 1982-10-26 1982-10-26 METHOD OF PREPARING A 5-METHYL-3-ISOXAZOLOL DK149649C (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DK474282A DK149649C (en) 1982-10-26 1982-10-26 METHOD OF PREPARING A 5-METHYL-3-ISOXAZOLOL
DK319283A DK150615C (en) 1982-10-26 1983-07-11 METHOD FOR PREPARING SUBSTITUTED 3-ISOXAZOLOLS
JP50346883A JPS59501907A (en) 1982-10-26 1983-10-25 Method for producing 3-hydroxy-isoxazolol
PCT/DK1983/000097 WO1984001774A1 (en) 1982-10-26 1983-10-25 A process for the preparation of 3-hydroxy-isoxazolole
EP19830903381 EP0125253A1 (en) 1982-10-26 1983-10-25 A process for the preparation of 3-hydroxy-isoxazolole

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK474282 1982-10-26
DK474282A DK149649C (en) 1982-10-26 1982-10-26 METHOD OF PREPARING A 5-METHYL-3-ISOXAZOLOL

Publications (3)

Publication Number Publication Date
DK474282A true DK474282A (en) 1984-04-27
DK149649B DK149649B (en) 1986-08-25
DK149649C DK149649C (en) 1987-04-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
DK474282A DK149649C (en) 1982-10-26 1982-10-26 METHOD OF PREPARING A 5-METHYL-3-ISOXAZOLOL

Country Status (1)

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DK (1) DK149649C (en)

Also Published As

Publication number Publication date
DK149649C (en) 1987-04-21
DK149649B (en) 1986-08-25

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