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Process for the eco-friendly preparation of 3, 5-dibromo-4-hydroxybenzonitrile
US8957239B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8957239-B2 |
| Application number | US-201013981647-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 25, 2010 |
| Priority date | Feb 25, 2009 |
| Publication date | Feb 17, 2015 |
| Grant date | Feb 17, 2015 |
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Abstract
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A highly pure 3,5-dibromo-4-hydroxybenzonitrile (bromoxynil) has been prepared in high yield from 4-hydroxybenzonitrile using eco-friendly brominating reagent comprising of 2:1 mole ratio of bromide to bromate salts in aqueous acidic medium without any catalyst under ambient conditions with no work up procedure. The product 3,5-dibromo-4-hydroxybenzonitrile was obtained in 91-99% yield with melting point 189-191° C. and more than 99% purity by gas chromatographic analysis without any purification.
First claim
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We claim: 1. A process for the eco-friendly synthesis of 3, 5-dibromo-4-hydroxybenzonitrile comprising the steps of: (i) reacting 4-hydroxybenzonitrile in the range of 8.4 to 1260 m moles with a brominating reagent consisting of a alkali/alkaline earth metal bromide and alkali/alkaline earth metal bromate salts wherein the active bromide content in the brominating reagent is 16.8 to 2521 m moles, under continuous stirring; (ii) adding 0.015 to 3.0 moles of an inorganic acid to t…
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- C07C253/30Primary
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Operations & Transport · mapped topic
Operations & Transport · mapped topic
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- What does patent US8957239B2 cover?
- A highly pure 3,5-dibromo-4-hydroxybenzonitrile (bromoxynil) has been prepared in high yield from 4-hydroxybenzonitrile using eco-friendly brominating reagent comprising of 2:1 mole ratio of bromide to bromate salts in aqueous acidic medium without any catalyst under ambient conditions with no work up procedure. The product 3,5-dibromo-4-hydroxybenzonitrile was obtained in 91-99% yield with mel…
- Who is the assignee on this patent?
- Adimurthy Subbarayappa, Ramachandraiah Gadde, Joshi Girdhar, and 5 more
- What technology area does this patent fall under?
- Primary CPC classification C07C253/30. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Feb 17 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).