Method of preparing tetrahalobenzene compounds, chemical intermediates used therein and certain of the compounds themselves
US4550206A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 11, 1984 |
| Grant date | Oct 29, 1985 |
| Priority date | — |
| Expiry date | Jan 11, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C25/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Tetrahalobenzene compounds of the formula (I): ##STR1## in which X is independently chloro or, preferably, fluoro and Y is hydrogen or --N.sup.+ R.sub.3 A.sup.- in which each R is independently C.sub.1-4 alkyl and A is a radical capable of forming an anion A.sup.-, are prepared by PA1 (a) alkylating a compound of formula (II): ##STR2## or a salt thereof, to form a compound of formula (III): ##STR3## (b) treating the compound of formula (III) with a quaternizing agent of formula RA to form a compound of formula (IV): ##STR4## and (c) partially or completely reductively cleaving the compound of formula (IV) to replace one or both --N.sup.+ R.sub.3 A.sup.- groups by hydrogen. Compounds (I), in which Y is --N.sup.+ R.sub.3 A.sup.-, (III) and (IV) are novel. Compound (I) is useful in the synthesis of insecticides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.