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... |
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Process for the preparation of 1,3,5-trichlorobenzene
| Details |
Inventors: Petruck, Gerd-Michael; Wambach, deceased, Paul R.;
Assignee: Bayer Aktiengesellschaft (Leverkusen, DE)
Primary Examiner: Warren; Charles F.
Assistant Examiner: Boska; Joseph A.
Attorney, Agent or Firm: Sprung, Horn, Kramer & Woods
1,3,5-Trichlorobenzene is prepared by the isomerization of other trichlorobenzenes at an elevated temperature after the addition of aluminum trichloride and formic acid. |
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DETAILED DESCRIPTION What is claimed is: 1.
In a process for the preparation of 1,3,5-trichlorobenzene by isomerization of at least one other trichlorobenzene at an elevated temperature in the presence of aluminum trichloride, the improvement wherein the isomerization is carried out in the presence of formic acid.
2.
A process according to claim 1, wherein the process is carried out at a temperature of from 150.
degree.
to 300.
degree.
C.
after addition of from 0.
05 to 0.
5 mol of aluminum trichloride per mol of trichlorobenzene to be isomerized and in the presence of 0.
9 to 1.
5 mols of formic acid per mol of aluminum trichloride.
3.
A process according to claim 2, wherein the process is carried out in the presence of from 0.
1 to 0.
2 mol of aluminum trichloride per mol of trichlorobenzene.
4.
A process according to claim 2, wherein the isomerization is carried out in the presence of from 1.
0 to 1.
2 mols of formic acid per mol of aluminum trichloride.
5.
A process according to claim 1, wherein the process is carried out in the presence of pure formic acid.
6.
A process according to claim 4, wherein the process is carried out in the presence of pure formic acid.
7.
A process according to claim 1, wherein the process is carried out at a temperature of 150.
degree.
to 300.
degree.
C.
8.
A process according to claim 2, wherein the process is carried out at a temperature of 200.
degree.
to 250.
degree.
C.
Description:
The invention relates to a process for the preparation of 1,3,5-trichlorobenzene by the isomerization of other trichlorobenzenes.
The preparation of 1,3,5-trichlorobenzene by the isomerization of other trichlorobenzenes in the presence of, for example, aluminum chloride and water (U.
S.
Pat.
No.
2,866,829), in the presence of halides of aluminum and water or alcohols (German Patent Specification No.
947,304), in the presence of aluminum chloride and magnesium sulphate (Zh.
Org.
Khim.
1968, 1247) and in the presence of aluminum chloride and magnesium chloride (CA 63, 9770a) is known
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Molecular Biology 
