Preparation of 2,3-dichloro-5-trichloromethylpyridine
First Claim
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1. In a process for preparing 2,3-dichloro-5-trichloromethylpyridine by contacting 2-chloro-5-trichloromethylpyridine in the liquid state with chlorine in the presence of a catalyst at a temperature of 70°
- to 250°
C., and at a pressure of from atmospheric pressure to 200 psig, the improvement comprising employing an effective amount of a catalyst selected from the group consisting of tungsten hexachloride, molybdenum pentachloride, tungsten oxytetrachloride, molybdenum oxytetrachloride and ruthenium chloride, whereby 2,3-dichloro-5-trichloromethylpyridine is obtained in a yield of at least 70 percent of final product.
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Abstract
Preparation of 2,3-dichloro-5-trichloromethylpyridine in high yields and purity by chlorinating 2-chloro-5-trichloromethylpyridine at 70° to 250° C. with chlorine in the presence of a catalyst containing one or more molybdenum, tungsten or ruthenium compounds.
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Citations
6 Claims
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1. In a process for preparing 2,3-dichloro-5-trichloromethylpyridine by contacting 2-chloro-5-trichloromethylpyridine in the liquid state with chlorine in the presence of a catalyst at a temperature of 70°
- to 250°
C., and at a pressure of from atmospheric pressure to 200 psig, the improvement comprising employing an effective amount of a catalyst selected from the group consisting of tungsten hexachloride, molybdenum pentachloride, tungsten oxytetrachloride, molybdenum oxytetrachloride and ruthenium chloride, whereby 2,3-dichloro-5-trichloromethylpyridine is obtained in a yield of at least 70 percent of final product.
- to 250°
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2. Process of claim 1 wherein the temperature is from 150°
- to 200°
C.
- to 200°
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3. Process of claim 1 wherein the reaction is carried out under ambient pressure conditions.
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4. Process of claim 1 wherein the reaction is carried out under elevated pressure conditions.
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5. Process of claim 1 wherein the catalyst is tungsten hexachloride.
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6. Process of claim 1 wherein the catalyst is molybdenum pentachloride.
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Current AssigneeThe Dow Chemical Company (Dow, Inc.)
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Original AssigneeThe Dow Chemical Company (Dow, Inc.)
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InventorsWerner, John A., Mixan, Craig E., Wilson, Charles A.
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Primary Examiner(s)Rotman, Alan L.
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Application NumberUS06/711,543Time in Patent Office671 DaysField of Search546/345, 546/346US Class Current546/345CPC Class CodesB01J 27/13 Platinum group metalsB01J 27/132 with chromium, molybdenum, ...C07D 213/26 Radicals substituted by hal...
