C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
260/166, 260/311
C09B 45/14 (2006.01) C07D 263/58 (2006.01) C09B 62/507 (2006.01)
Patent
CA 1098901
Abstract of the disclosure: An improved and novel process has been found for the esterification of amino-benzoxazolone compounds containing a B-hydroxyethylsulfonyl group, by means of sulfuric acid or sulfur trioxide, with simultaneous or subsequent hydrolytic cleavage of the oxazolone ring, wherein the esterification and optional hydrolytic ring cleavage are performed in a machine which is operating with a kneading action and effect, using per mol of B-hydroxyethylsulfonyl compound 1 to 20 times the equivalent molar amount of concentrated sulfuric acid, oleum or sulfur trioxide. This novel process has the great advantage that great amounts of sulfuric acid are saved which would con- taminate the waste-water, also in form of sodium sulfate form- ed after the required neutralization. Furthermore, the B-sul- fatoethylsulfonyl compounds formed as end-products in the esterification process are obtained in higher yields, in a higher esterification rate and in a higher purity. They may be obtained in form of a powder or plastic mass, which is well transportable and storable, and can advantageously be used, if ring cleavage had taken place, without intermediate isolation of the pure sulfato compound itself, directly for the preparation of azo dyestuffs which are poor of inert salts, possess a high tinctorial strength and purity.
283929
Hoyer Ernst
Steuernagel Hans H.
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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