Method for separating 1-chloro-3,3,3-trifluoropropene and hydrogen fluoride, and method for producing 1-chloro-3,3,3-trifluoropropene by using same
US-9221732-B2 · Dec 29, 2015 · US
Process for the preparation of benzonorbornenes
US9796646B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9796646-B2 |
| Application number | US-201514603857-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 23, 2015 |
| Priority date | Oct 27, 2008 |
| Publication date | Oct 24, 2017 |
| Grant date | Oct 24, 2017 |
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Abstract
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The present invention relates to a novel process for the preparation of 9-dichloromethylene-1,2,3,4-tetrahydro-1,4-methano-naphthalen-5-ylamine which process comprises a) reacting cyclopentadiene in the presence of a radical initiator and CXCl 3 , wherein X is chloro or bromo, to a compound of formula II aa) reacting cyclopentadiene with CXCl 3 , wherein X is chloro, in the presence of a metal catalyst to a compound of formula II wherein X is chloro, b) reacting the compound of formula II with a base in the presence of an appropriate solvent to the compound of formula III c) and converting the compound of formula III in the presence of 1,2-dehydro-6-nitrobenzene to the compound of formula IV and d) hydrogenating the compound of formula IV in the presence of a metal catalyst.
First claim
Opening claim text (preview).
What is claimed is: 1. A process for the preparation of the compound of formula III which process comprises a) reacting cyclopentadiene with CXCl 3 , wherein X is chloro or bromo, in the presence of a radical initiator to produce a compound of formula II wherein X is chloro or bromo, and wherein the radical initiator is selected from at least one of methyl ethyl ketone peroxide, benzoyl peroxide, azobisisobutyronitrile, dibenzoylperoxide, bis(tert-butylcyclohexyl)peroxydicarbonate, a metal salt, and a metal salt complex, and b) reacting the compound of formula II with a base in the presence of an appropriate solvent. 2. A process according to claim 1 , wherein X is bromo. 3. The process according to claim 1 , wherein the radical initiator is selected from at least one of azobisisobutyronitrile, dibenzoylperoxide and bis(tert-butylcyclohexyl)peroxydicarbonate. 4. The process according to claim 1 , wherein the radical initiator is azobisisobutyronitrile.
Assignees
Inventors
Classifications
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
- C07C17/23Primary
by dehalogenation · CPC title
with at least one of the condensed ring systems formed by three or more rings · CPC title
of hydrocarbons and halogenated hydrocarbons · CPC title
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- What does patent US9796646B2 cover?
- The present invention relates to a novel process for the preparation of 9-dichloromethylene-1,2,3,4-tetrahydro-1,4-methano-naphthalen-5-ylamine which process comprises a) reacting cyclopentadiene in the presence of a radical initiator and CXCl 3 , wherein X is chloro or bromo, to a compound of formula II …
- Who is the assignee on this patent?
- Syngenta Participations Ag, Syngenta Crop Protection Llc
- What technology area does this patent fall under?
- Primary CPC classification C07C17/23. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Oct 24 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).