EP0000542B1 - Verfahren zur Herstellung von Trifluormethylphenolen - Google Patents

Verfahren zur Herstellung von Trifluormethylphenolen Download PDF

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Publication number
EP0000542B1
EP0000542B1 EP78100436A EP78100436A EP0000542B1 EP 0000542 B1 EP0000542 B1 EP 0000542B1 EP 78100436 A EP78100436 A EP 78100436A EP 78100436 A EP78100436 A EP 78100436A EP 0000542 B1 EP0000542 B1 EP 0000542B1
Authority
EP
European Patent Office
Prior art keywords
process according
nitro
employed
formula
alkali metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP78100436A
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German (de)
English (en)
French (fr)
Other versions
EP0000542A1 (de
Inventor
Albrecht Dr. Marhold
Erich Dr. Klauke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
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Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
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Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C201/00Preparation of esters of nitric or nitrous acid or of compounds containing nitro or nitroso groups bound to a carbon skeleton
    • C07C201/06Preparation of nitro compounds
    • C07C201/12Preparation of nitro compounds by reactions not involving the formation of nitro groups

Definitions

  • the invention relates to a process for the preparation of phenols having a trifluoromethyl group.
  • trifluoromethylphenols are obtained by cleaving the corresponding methoxy compounds with pyridine hydrochloride at 210 ° C. (J. org. Chem. 27, 4660 (1962): in this process, the methoxy compounds are prepared from chloronitrobenzotrifluorides in a preceding process step.
  • Halogens (X) can be fluorine, chlorine, bromine or iodine, preferably fluorine or chlorine.
  • Halogen atom (Y) may be, for example, fluorine, chlorine, bromine or iodine, preferably chlorine or bromine.
  • the alkoxy group (Y) preferably contains alkyl radicals having 1 to 4 carbon atoms, for example the methyl, ethyl, propyl, isopropyl, butyl or tert-butyl radical.
  • Alkonols with a lower unbranched or branched alkyl radical can be used as solvents for the process according to the invention.
  • Alcohols whose unbranched or branched alkyl radical has 1 to 4 carbon atoms such as methanol, ethanol, propanol, isopropanol, the various isomeric butanols, glycol and glycol monomethyl ether, are preferred.
  • the amount of solvent can vary within wide limits, for example 1 to 20 parts by weight, preferably 2 to 8 parts by weight, of solvent can be used per 1 part by weight of a compound of the formula (I).
  • Sodium or potassium hydroxide are preferably used as alkali metal hydroxides for the process according to the invention. They are generally used in the form of their aqueous solutions which contain, for example, 30-50% by weight of alkali metal hydroxide. However, the sodium or potassium hydroxide can also be added in solid form to the aqueous alcoholic solution.
  • the alkali metal hydroxides are generally used in excess, the use of about three times the molar amount based on the conversion of the halogen atom to the phenolic hydroxyl group is particularly advantageous.
  • the water content of the reaction solution can vary within wide limits. In general, it can be about 20 to 25% by weight.
  • the radicals R 4 to R 7 can be low-molecular or high-molecular organic radicals.
  • Optionally substituted alkyl radicals, cycloalkyl radicals, aralkyl radicals or aryl radicals may be mentioned as low molecular weight organic radicals.
  • Two of the radicals R 4 to R 7 can also form a heterocycle together with the central atom Z and optionally further heteroatoms.
  • the optionally substituted or branched alkyl radicals can especially those with 1-18 Carbon atoms, preferably having 1-12 carbon atoms, such as the methyl, ethyl, isomeric propyl, butyl, octyl, decyl or dodecyl radicals.
  • the cycloalkyl radicals can be cyclopentyl and in particular cyclohexyl radicals which are optionally substituted by C 1 -C 4 -alkyl radicals.
  • the aralkyl radicals can optionally be benzyl radicals substituted by C i -c 4- alkyl radicals, methoxy groups or halogen atoms.
  • the aryl radicals can be phenyl radicals which are optionally substituted by C 1 -C 4 -alkyl radicals, methoxy groups, ethoxy groups or halogen atoms.
  • the 5- and 6-membered heterocycles may be mentioned, for example the pyrrolidine ring, the piperidine ring or the morpholine ring.
  • polystyrene which may be crosslinked by divinylbenzene.
  • the total number of carbon atoms of all radicals R 4 to R 7 is at least six for the process according to the invention.
  • the maximum number of all carbon atoms in a polymeric organic radical can be very large.
  • the preferred total number of carbon atoms of all low-molecular radicals R 4 to R 7 is 8 to 25.
  • Preferred anions A are the chloride, bromide and hydroxide anion.
  • Examples of the preferred quaternary ammonium or phosphonium salts are: tetraethylammonium chloride, tetrabutylammonium bromide, triethylbenzylammonium hydroxide, benzyldimethyldodecylammonium chloride, dibutylpiperidiniumbromide, methyltrioctylammoniumchloride, dimethylbenzylpidylphenyl-methyldylylphenyl-methylphenyl-methyl-phenyl methyl-piperdinium hydroxide, triethyl-phenyl-ammonium chloride, dodecyl-trimethyl-ammonium hydroxide, cyclohexyldodecyl-dimethyl-ammonium chloride, methyl-ethyl-piperidinium bromide, triphenyl-benzyl-phosphonium bromide, tetrabutyl-phosphonium chloride,
  • Quaternary ammonium compounds in which one of the radicals R 4 to R 7 is a polymeric radical can be, for example, ion exchangers based on styrene and generally 2 mol% of divinylbenzene as crosslinking agents which carry quaternary ammonium groups.
  • the amounts of the quaternary onium salt used can vary from 1 to 20% by weight and are generally about 5 to 10% by weight, based on the starting compound.
  • phase transition catalysts in multiphase systems and can be prepared by known processes (Houben-Weyl, 4th ed. Stuttgart 1958, volume XI, 2, p. 587 and volume XIV, 2nd p. 750).
  • the process according to the invention can be carried out in the temperature range from about 0 to about 80 ° C., preferably from about 50 to 75 ° C.
  • the alkyl radicals R 12 of these alkoxy compounds are determined by the alcohol used as solvent; when using methanol, a methoxy compound is obtained.
  • alkoxy compounds are known (J. Org. Chem. 26, 2707 (1961)) and can be prepared, for example, by reacting an organically bonded halogen atom with sodium methylate or with methanolic potassium hydroxide.
  • the process according to the invention has the advantage of being simple to carry out and of leading to the desired phenols in one step.
  • the quaternary onium salts of the formula (IV) are known as phase transition catalysts in systems with two immiscible liquid phases (DT-OS 2 634 419).
  • the method according to the invention is carried out with quaternary onium compounds in a system with only one liquid phase.
  • the trifluoromethylphenols are intermediate products for the production of crop protection agents, in particular herbicides (DT-OS 2311 638, DT-OS 1 944 335).
  • a trifluoromethylphenol of the formula VI can be reacted with p-nitrochlorobenzene in the presence of potassium m-methylate to give trifluoromethyl-nitrodiphenyl ether.
  • Herbicides from new trifluoromethylphenols of the formula VII show improved activity compared to the known herbicides.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
EP78100436A 1977-07-26 1978-07-19 Verfahren zur Herstellung von Trifluormethylphenolen Expired EP0000542B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2733682 1977-07-26
DE19772733682 DE2733682A1 (de) 1977-07-26 1977-07-26 Verfahren zur herstellung von trifluormethylphenolen

Publications (2)

Publication Number Publication Date
EP0000542A1 EP0000542A1 (de) 1979-02-07
EP0000542B1 true EP0000542B1 (de) 1981-07-15

Family

ID=6014871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100436A Expired EP0000542B1 (de) 1977-07-26 1978-07-19 Verfahren zur Herstellung von Trifluormethylphenolen

Country Status (7)

Country Link
US (1) US4225731A (enrdf_load_stackoverflow)
EP (1) EP0000542B1 (enrdf_load_stackoverflow)
JP (1) JPS5424839A (enrdf_load_stackoverflow)
DE (2) DE2733682A1 (enrdf_load_stackoverflow)
DK (1) DK154949C (enrdf_load_stackoverflow)
IL (1) IL55209A (enrdf_load_stackoverflow)
IT (1) IT1105942B (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400552A (en) * 1980-04-21 1983-08-23 The Franklin Institute Method for decomposition of halogenated organic compounds
US4460797A (en) * 1981-03-05 1984-07-17 The Franklin Institute Method for decomposition of halogenated organic compounds
DE3120912A1 (de) * 1981-05-26 1982-12-16 Hoechst Ag, 6000 Frankfurt Verfahren zur herstellung von p-nitrophenetol
FR2529197A1 (fr) * 1982-06-29 1983-12-30 Rhone Poulenc Agrochimie Procede de preparation de phenates substitues par des groupes halogenes ou des phenols correspondants
US4602994A (en) * 1982-09-30 1986-07-29 The Franklin Institute Removal of PCBs and other halogenated organic compounds from organic fluids
US4417977A (en) * 1982-09-30 1983-11-29 The Franklin Institute Removal of PCBS and other halogenated organic compounds from organic fluids
HU190439B (en) * 1983-02-03 1986-09-29 Budapesti Vegyimuevek,Hu Herbicidal, akaricidal and plant growth regulating compsitions comprising 2-/trifluoromethyl/-4,6-dinitrophenol or its salts as active substance and process for preparing the active substances
GB8708517D0 (en) * 1987-04-09 1987-05-13 Shell Int Research Preparation of fluorophenols
DE3712817A1 (de) * 1987-04-15 1988-10-27 Bayer Ag Verwendung von fluormethylphenolen als loesungsmittel fuer lc-polymere, und neue fluormethylphenole
EP0537592B1 (de) * 1991-10-09 1996-01-17 Hoechst Aktiengesellschaft Verfahren zur Herstellung von 2-Nitro-5-fluor- bzw. -5-chlor-phenol

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB718779A (en) * 1952-01-05 1954-11-17 Pechney Cie De Prod Chim Et El Process for manufacturing pentachlorophenol and alkali pentachlorophenates
US2872461A (en) * 1954-10-21 1959-02-03 Schering Ag Process of producing chloranil
US2950325A (en) * 1958-06-06 1960-08-23 Dow Chemical Co Process for making fluorophenols
BE635553A (enrdf_load_stackoverflow) * 1962-07-30
FR1469596A (fr) * 1966-01-06 1967-02-17 Saint Gobain Procédé de préparation du para-trifluorméthylphénol
US3813446A (en) * 1968-06-24 1974-05-28 Sherwin Williams Co Production of trifluoromethylnitrophenols and related compounds
US3943180A (en) * 1972-02-29 1976-03-09 Bayer Aktiengesellschaft 2,4-Bis-(trifluoromethyl)-6-nitrophenol compounds and herbicidal compositions

Also Published As

Publication number Publication date
IL55209A0 (en) 1978-09-29
JPS6256850B2 (enrdf_load_stackoverflow) 1987-11-27
DE2733682A1 (de) 1979-02-08
IT1105942B (it) 1985-11-11
IT7850434A0 (it) 1978-07-24
DE2860838D1 (en) 1981-10-22
DK330178A (da) 1979-01-27
US4225731A (en) 1980-09-30
IL55209A (en) 1983-02-23
JPS5424839A (en) 1979-02-24
DK154949C (da) 1989-05-29
EP0000542A1 (de) 1979-02-07
DK154949B (da) 1989-01-09

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