No abstract

The first stable aromatic S-nitrosothiol, S-nitroso-4-t-butyl-2,6-bis[(2,2″, 6,6″-tetramethyl-m-terphenyl-2′-yl)methyl]benzenethiol, was synthesized by the nitrosation of the corresponding thiol and the structure was established by X-ray crystallography. Its oxidation and reactions with some nucleophiles were carried out.

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2,7-Disubstituted 5H-1,3,4-thiadiazolo[3,-2-a]pyrimidin-5-ones were synthesized from the reaction of 3-amino-6-methyl-2-thiouracil with carboxylic acid or from that of thiosemicarbazide with carboxylic acid and β-keto ester in the presence of phosphorus pentaoxide and methanesulfonic acid. The synthesis of related compounds is also described.

Formic acid‐phosphorus pentoxide was effective for the preparation of 5,7‐dimethyl[1,3,4]thiadiazolo‐ and ‐[1,3]thiazolo[3,2‐a]pyrimidin‐4‐ium salts. Further, the pyrimidine ring transformation and the isocyanation of 5imino‐6H‐[1,3,4]thiadiazolo‐ and ‐[1,3]thiazolo[3,2‐a]pyrimidin‐7‐ones were carried out in the presence of formic acid and triethyl orthoformate, respectively.