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Preparation of 2-R 5-oxo 5-H 6 -N,N-diethylcarboxamide 7-phenyl 1,3,4-thiadiazolo-(3,2- a) pyrimidine through reaction of 2-R 5-Oxo 5-H 6- ethyl carboxilate 7-phenyl -1, 3,4 - thiadiazolo- (3,2-a) pyrimidine with N,N-diethylamin have been discussed in the paper. These compounds have many medicinal properties and are used in allergy medication and in anti-microbial studies. The structures of the compounds were elucidated using NMR, 13 C, IR- spectroscopy.

Preparation of 2-R 5-oxo5-H6-N,N-diethylcarboxamide 7-phenyl-[1,3,4]thiadiazolo-[3,2-a]pyrimidine and Study of Biological Properties