PREPARATION OF BROMINATED TRIFLUOROMETHYL BENZENES

PROBLEM TO BE SOLVED: To obtain brominated trifluoromethylbenzene in high yield by coexisting bromine with chlorine in bromination of trifluoromethylbenzene in liquid phase under the presence of an iron-containing catalyst. SOLUTION: This compound of formula II ((m) is 1-3) [e.g. 3,5-bis(trifluorome...

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Bibliographische Detailangaben
Hauptverfasser:	UJIIE MIKIO, KUME KOJI, KANEDA SHOZO, TSUKADA ERI, NARIZUKA SATOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain brominated trifluoromethylbenzene in high yield by coexisting bromine with chlorine in bromination of trifluoromethylbenzene in liquid phase under the presence of an iron-containing catalyst. SOLUTION: This compound of formula II ((m) is 1-3) [e.g. 3,5-bis(trifluoromethyl)bromobenzene or the like] is obtained by brominating (A) the compound of formula I ((n) is 1-2) [e.g. 1,3-bis(trifluoromethyl)benzene or the like] in the presence of (B) the iron-containing catalyst (e.g. ferric chloride, ferric bromide or the like), in liquid phase in (C) the coexistence of bromine with chlorine, preferably at 50-200 deg.C under 1-100 kg/cm2 of pressure in a reactor. In the above reaction, 0.1-100 mole of iron in the component B is preferably used for 100 mole of the component A and 1-2 mole of chlorine is preferably used to 1 mole of bromine in the component C.