CA2022133C - Monoclinic metazachlor and its preparation - Google Patents

Monoclinic metazachlor and its preparation Download PDF

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Publication number
CA2022133C
CA2022133C CA002022133A CA2022133A CA2022133C CA 2022133 C CA2022133 C CA 2022133C CA 002022133 A CA002022133 A CA 002022133A CA 2022133 A CA2022133 A CA 2022133A CA 2022133 C CA2022133 C CA 2022133C
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CA
Canada
Prior art keywords
modification
crystalline modification
dimethyl
acetanilide
monoclinic
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Expired - Lifetime
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CA002022133A
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French (fr)
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CA2022133A1 (en
Inventor
Michael Keil
Bjoern Girgensohn
Gotthard Synnatschke
August Wigger
Hans Ziegler
Walter Gueckel
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BASF SE
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BASF SE
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Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D231/00Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
    • C07D231/02Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
    • C07D231/10Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D231/12Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/48Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with two nitrogen atoms as the only ring hetero atoms
    • A01N43/561,2-Diazoles; Hydrogenated 1,2-diazoles
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D233/00Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
    • C07D233/54Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
    • C07D233/56Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D249/00Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms
    • C07D249/02Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms not condensed with other rings
    • C07D249/081,2,4-Triazoles; Hydrogenated 1,2,4-triazoles

Abstract

Monoclinic 2-chloro-(2',6'-dimethyl-N-pyrazol-1-ylmethyl)-acetanilide of the formula (see formula I) which melts at 76°C.
Processes far its preparation and herbicides.

Description

' __ O.Z. 0050/40985 Monoclinic metazachlor and its preparation The present invention relates to monoclinic 2-chloro-(2',6'-dimethyl-N-pyrazol-1-ylmethyl)-acetanilide of the formula I

i-v N~ I

which melts at 76°C, and processes for the preparation of this modification, its use as a herbicide, and herbicides which contain this active ingredient.
The important herbicidal active ingredient 2 chloro-(2',6'-dimethyl-N-pyrazol-1-ylmethyl)-acetanilide I (common names metazachlor) melts, as far as is known, in a range of 78-83°C and crystallizes in a triclinic crystalline forma 'This crystalline form IA is obtained by the methods described in DE-A 2 648 008, DE-A 2 830 764 and EP-A 12216, by crystallization of I from a non-polar or slightly polar solvent, such as cyclohexane or toluene.
I~owever, this known modification IA of metaza-chlor, which is commercially available in the form of concentrated aqueous suspensions, has the disadvantage that it frequently forms agglomerates.
The agents then cannot be sprayed uniformly, if at all:
In efforts aimed'at remedying this deficiency, a monoclinic modification of I, which modification melts at 76°C, was found.
This monoclinic modification IE is obtained if water is added to an aqueous metazachlor solution con-taining sulfur:.c acid, at from 0 to 50°C, in the presence of a water-miscible polar inert organic solv~nt, and the resulting solid is isolated in a conventional manner after crystallization is complete.
In this process, the order in which the active ingredient solution, the organic solvent and the water r.
- 2 - O.Z. 0050/40985 are mixed with one another is unimportant for the crystallization.
Seeding with crystals of modification IB is not essential but generally proves advantageous.
Particular suitable protic polar inert solvents are alcohols, such as methanol, ethanol, isopropanol, n-propanol, 1-butanol, 2-butanol, isobutanol, tent-butanol, ethylene glycol, propylene glycol, propane-1,3-diol and butanediols, ketones, such as acetone and butan-2-one, ethers, such as tetrahydrofuran and 1,4-dioxane, amides, such as dimethylformamide and N-methylpyrrolidone, and dimethyl sulfoxide and diethylene glycol.
The seed crystals required for the preparation of metazachlor in modification IB in amounts of from 0.01 to 50~ by weight can be obtained for the first time, for example, by recrystallization of metazachlor of modifica-tion IA from the abovementioned polar organic solvents.
In another possible method for the preparation of metazachlor of modification IB, from 0.01 to 50~ by weight of seed crystals of modification IB are added to an aqueous suspension of metazachlor of modification IA
at a pH of from O to 10, with or without the addition of one or more of the abovementianed water-soluble organic solvents, at from O to 45°C, and stirring is carried out at from 0.1 to 20 hours. Modification IA xs transformed into modification IB.
This transformation also takes place in a similar manner when an aqueous suspension of modification IA is milled in the presence of the stated organic solvents with the addition of geed crystals of modification IB.
Characteristic physical data for distinguishing between the two modifications are summarized in the Table below.
- 3 - O.Z. 0050/40985 TABLE
Method of measurement Unit IA IB
Differential thermal °C 79 76 analysis IR spectroscopy* cm-1 3160, 1300 1360, 780 X-ray diffraction pattern (diffraction angle 2 e) degrees 8.2; 8.4 9.9; 12.3 Solid-state 13C-NMR
spectroscopy*
(against adamantane) s in ppm 62.5; 137.1 51.4; 139.1 Modification from X-ray structural analysis - triclinic monoclinic Microscopy - amorphous coffin-lid-.
(crystal form) shaped * Selected signals The effect of the invention is as follows:
Formulated product containing metazachlor of the known modification IA changes during storage. The size of the suspended particles increases continuously; in the formulated product, this is evident in the formation of fragments right up to complete solidification of the previously liquid product, so that uniform application of the product is no longer ensured.
Formulated product containing metazachlor of modification IB does not have'this undesirable behavior and can be applied s.atisfactoriiy every after prolonged storage.
During these investigations, a further metastable metazachlor modification IC which melts at 84°C was found.
This modification is obtained by heating metazachlor of modification IA to 84°C and milling the melt formed.
On standing, the metazachlor modification IC, which has a half-life of about 5 days, is transformed into modification IB, which melts at 76°C.
The Examples which follow illustrate the novel s~ .r, ~l v3 ~~'~;.~.~.ar~
-- 4 -- O.Z. OOSO/40985 process:
1. Precipitation of an acidic aqueous metazachlor solu-tion with seeding with modification IB.
a) 1,250 ml of water and 22 ml of methanol are initially taken at 25°C. For seeding, 3.8 g of metazachlor of modification IB are added. 62.5 g of a 40~ strength metazac'~lor solution in 60~
strength sulfuric acid are then added slowly while stirring, stirring is continued for one hour and a further 562.5 g of the metazachlor solution are then added rapidly. After complete precipitation, the precipitate is isolated, washed with water and dried. 247 g of metazachlor of modification IB are obtained.
b) 7.6 g of methanol and 51 g of water are added to a solution of 63 g of metazachlor of modification IA in 90 g of 60~ strength sulfuric acid, while stirring, at 40°C. After the addition of 3 g of metazachlor of modification IB, 133 ml of water are added in the course of two hours and then a further 113 ml of water are added rapidly. Stir-rir_g is continued for two hours and the product is filtered off under suction, washed with 200 ml of water and then dried. 62.3 g of metazachlor of modification IB are obtained.
2. Preparation of metazachlor of modification IB by transformation of the crystalline modification IA in aqueous suspension.
1 g of modification IB is added to a suspension of 10 g of metazachlor of modification IA in 127 g of 15~ strength sulfuric acid and 2 g of methanol, the mixture is stirred for 20 hours at 20°C and the product is filtered off under suction and washed with 500 ml of water. Metazachlor of modification IB is obtained.
3. Preparation of metazachlor of modification IB by crystallization from methanolic aqueous solution - 5 - O.Z. 0050/40985 A mixture of 2,2 1 of methanol and 1,500 g of metazachlor of modification IA is converted into a solution at 50°C. The solution is slowly allowed to reach room temperature, and 5.2 1 of water are slow-s ly added to the partially crystallizing mixture.
Filtration under suction and washing with 1 1 of water give 1,485 g of metazachlor of modification Ig.

Claims (7)

1. A monoclinic crystalline modification of
2-chloro-(2',6'-dimethyl-N-pyrazol-1-ylmethyl)-acetanilide of the formula I
said modification melting at 76°C.

2. A process for the preparation of a monoclinic crystalline modification of the compound of the formula I as claimed in claim 1, wherein a triclinic crystalline modification 2-chloro-(2', 6'-dimethyl-N-pyrazol-1-ylmethyl)-acetanilide is recrystal-lined from a polar inert organic solvent and the solid is isolated after crystallization is complete.
3. A process for the preparation of a monoclinic crystalline modification of the compound of the formula I as claimed in claim 1, wherein a triclinic crystalline modification of 2-chloro-(2', 6'-dimethyl-N-pyrazol-1-ylmethyl)-acetanilide is crystallized from aqueous solution containing sulfuric acid, at from 0 to 50°C, in the presence of a polar water-miscible inert organic solvent.
4. A process for the preparation of a monoclinic crystalline modification of the compound of the formula I as claimed in claim 1, wherein an aqueous suspension of a triclinic crystalline modification 2-chloro-(2', 6'-dimethyl-N-pyrazol-1-ylmethyl)-acetanilide, which modification melts at 79°C, is milled, at from 0 to 45°C, with a polar water-miscible inert organic solvent in the presence of crystals of a monoclinic crystalline modification of 2-chloro-(2', 6'-dimethyl-N-pyrazol-1-ymelting)-acetanilide, which melts at 76°C.
5. A herbicide containing conventional inert additives and a herbicidally effective amount of the monoclinic crystalline modification claimed in claim 1.
6. A herbicide as claimed in claim 5, which contains from 0.1 to 95o by weight of said monoclinic crystalline modification which melts at 76°C.
7. A method for controlling undesirable plant growth, wherein the seeds, the plants and/or their habitat are or is treated with a herbicidally effective amount of the monoclinic crystalline modification claimed in claim 1.
CA002022133A 1989-07-29 1990-07-27 Monoclinic metazachlor and its preparation Expired - Lifetime CA2022133C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3925253.1 1989-07-29
DE3925253A DE3925253A1 (en) 1989-07-29 1989-07-29 MONOCLINES METAZACHLOR AND METHOD FOR THE PRODUCTION THEREOF

Publications (2)

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CA2022133A1 CA2022133A1 (en) 1991-01-30
CA2022133C true CA2022133C (en) 2000-09-19

Family

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Family Applications (1)

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Country Status (11)

Country Link
EP (1) EP0411408B1 (en)
JP (1) JP2935547B2 (en)
KR (1) KR0177808B1 (en)
AT (1) ATE96785T1 (en)
BR (1) BR9003682A (en)
CA (1) CA2022133C (en)
DE (2) DE3925253A1 (en)
DK (1) DK0411408T3 (en)
ES (1) ES2059918T3 (en)
HU (1) HU205910B (en)
ZA (1) ZA905911B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4436293A1 (en) 1994-10-11 1996-04-18 Basf Ag Stable mixture containing water and metazachlor
DE10210409A1 (en) * 2002-03-09 2003-09-18 Feinchemie Schwebda Gmbh Purely triclinic metazachlor and process for its manufacture
DE10337162A1 (en) 2003-08-11 2005-03-17 Basf Ag Storage-stable herbicidal mixtures with metazachlor
PL1734823T5 (en) 2004-04-01 2018-05-30 Basf Agrochemical Products, B.V. Synergistically acting herbicidal mixtures
HUE028048T2 (en) 2008-04-29 2016-11-28 Basf Se Herbicide mixture
PL2346326T3 (en) * 2008-10-14 2014-08-29 Basf Se Crystalline complexes of pendimethalin and metazachlor
JP5697655B2 (en) 2010-02-23 2015-04-08 日本化薬株式会社 Stable crystals of 2-ethyl-3,7-dimethyl-6- (4- (trifluoromethoxy) phenoxy) quinolin-4-ylmethyl carbonate, method for producing the same, and agrochemical composition containing the crystals
AU2012298515B2 (en) 2011-08-25 2015-09-17 Basf Se Herbicidal compositions comprising chloroacetamides
PL3319426T3 (en) 2015-07-10 2019-12-31 BASF Agro B.V. Herbicidal composition comprising cinmethylin and metazachlor
WO2017009089A1 (en) 2015-07-10 2017-01-19 BASF Agro B.V. Herbicidal composition comprising cinmethylin, metazachlor and quinolinecarboxylic acids

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2648008C3 (en) * 1976-10-23 1980-09-04 Basf Ag, 6700 Ludwigshafen Acetanilide
DE2830764A1 (en) * 1978-07-13 1980-01-31 Basf Ag ACETANILIDE
DE2849442A1 (en) * 1978-11-15 1980-05-29 Basf Ag METHOD FOR PRODUCING MOST PURE PYRAZOLIC COMPOUNDS
DE2930448A1 (en) * 1979-07-26 1981-02-26 Bayer Ag COUNTERPROTECTOR FOR THE PROTECTION OF CULTURAL PLANTS FROM HERBICIDE DAMAGE

Also Published As

Publication number Publication date
HUT54661A (en) 1991-03-28
JPH0366671A (en) 1991-03-22
DE59003309D1 (en) 1993-12-09
KR910002804A (en) 1991-02-26
KR0177808B1 (en) 1999-03-20
ES2059918T3 (en) 1994-11-16
BR9003682A (en) 1991-09-03
ATE96785T1 (en) 1993-11-15
JP2935547B2 (en) 1999-08-16
HU904660D0 (en) 1991-01-28
ZA905911B (en) 1992-03-25
HU205910B (en) 1992-07-28
EP0411408B1 (en) 1993-11-03
EP0411408A1 (en) 1991-02-06
CA2022133A1 (en) 1991-01-30
DE3925253A1 (en) 1991-01-31
DK0411408T3 (en) 1993-12-20

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