Claims
- 1. The compound in the .beta.-modification and having the formula ##STR5## wherein R represents hydrogen or C.sub.1 -C.sub.4 -alkyl and
- Ar represents phenyl, pyrazolyl, 4-chloropyrazolyl, 1,2,4-triazolyl or imidazolyl.
- 2. The compound of the formula ##STR6## in the .beta.-modification, characterised by d-values of 14.98 A, 7.56 A, 4.58 A and 3.45 A in the X-ray diffraction diagram.
- 3. Process for the preparation of the compound of claim 2 in the .beta.-modification, characterised in that the .alpha.-modification of the compound is dissolved in hot sulphuric acid and the solution is cooled.
- 4. The compound of the formula ##STR7## in the .beta.-modification, characterised by d-values of 21.55 A, 5.98 A, 3.60 A and 3.22 A in the X-ray diffraction diagram.
- 5. Process for the preparation of the compound of claim 4 in the .beta.-modification, characterised in that the .alpha.-modification of the compound is dissolved in hot sulphuric acid and the solution is cooled.
- 6. In a process for the purification of compounds of the formula ##STR8## wherein R is hydrogen or C.sub.1 -C.sub.4 -alkyl, and
- Ar is phenyl, pyrazolyl, 4-chloropyrazolyl, 1,2,4-triazolyl, or imidazolyl,
- the improvement which comprises dissolving said compounds in sulphuric acid and thereafter cooling the solution and recovering crystals of said compounds.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2313030 |
Mar 1973 |
DT |
|
Parent Case Info
This is a continuation, of application, Ser. No. 451,559 abandoned, filed Mar. 15, 1974.
Foreign Referenced Citations (1)
Number |
Date |
Country |
478,835 |
Nov 1969 |
CH |
Continuations (1)
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Number |
Date |
Country |
Parent |
451559 |
Mar 1974 |
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