| Abstrakt: |
The corresponding 2,3-diphenyl[3,2-a]pyrimidinium salts were obtained by the condensation of 4,5-diphenyl-2-aminothiazole perchlorate with ß-diketones, ß-chlorovinyl ketones, ß-chlorovinyl aldehydes, and 1,1,3,3-tetraethoxypropane. The PMR spectra were used to prove the structures of the compounds obtained, particularly to select the structures of the isomeric salts obtained in the condensation with unsymmetrical ß-diketones, ß-chlorovinyl ketones, and ß-chlorovinyl aldehydes. As a rule, the latter give one isomer — the ?-unsubstituted (relative to the bridge nitrogen atom) derivative. |
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