Processes for the preparation of pesticidal compounds
US-9108946-B2 · Aug 18, 2015 · US
Process for the preparation of 3-(3-chloro-1H-pyrazol-1-yl)pyridine
US9840490B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9840490-B2 |
| Application number | US-201615389531-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 23, 2016 |
| Priority date | Jul 31, 2014 |
| Publication date | Dec 12, 2017 |
| Grant date | Dec 12, 2017 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
3-(3-Chloro-1H-pyrazol-1-yl)pyridine is prepared by cyclizing 3-hydrazinopyridine-dihydrochloride with commercially available 3-ethoxyacrylonitrile to provide 3-(3-amino-1H-pyrazol-1-yl)pyridine, and by converting the amino group to a chloro group by a Sandmeyer reaction.
First claim
Opening claim text (preview).
What is claimed is: 1. A process for preparing diazonium salt (8b) comprising treating 3-(3-amino-1H-pyrazol-1-yl)pyridine (8a) with aqueous hydrochloric acid and sodium nitrite at a temperature of about 0° C. to about 25°C. 2. The process of claim 1 , wherein the sodium nitrite is used in an excess of about 1.3-fold to about 2-fold. 3. The process of claim 1 , wherein the sodium nitrite is added as an aqueous solution. 4. The process of claim 1 , wherein the aqueous hydrochloric acid is used in a large excess. 5. The process of the claim 1 , wherein the 3-(3-amino-1H-pyrazol-1-yl)pyridine (8a) and aqueous hydrochloric acid are mixed and cooled to about 0° C. 6. The process of claim 5 , wherein an aqueous solution of sodium nitrite is slowly added maintaining the temperature below about 5° C. 7. The process of claim 6 , wherein the step of treating is carried out at about 0° C. following the addition of the aqueous solution of sodium nitrite.
Assignees
Inventors
Classifications
- C07D401/04Primary
directly linked by a ring-member-to-ring-member bond · CPC title
with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms · CPC title
1,2-Diazoles; Hydrogenated 1,2-diazoles · CPC title
six-membered rings · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US9840490B2 cover?
- 3-(3-Chloro-1H-pyrazol-1-yl)pyridine is prepared by cyclizing 3-hydrazinopyridine-dihydrochloride with commercially available 3-ethoxyacrylonitrile to provide 3-(3-amino-1H-pyrazol-1-yl)pyridine, and by converting the amino group to a chloro group by a Sandmeyer reaction.
- Who is the assignee on this patent?
- Dow Agrosciences Llc
- What technology area does this patent fall under?
- Primary CPC classification C07D401/04. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 12 2017 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 12 related publications on this page (citations in our corpus or others sharing the same primary CPC).