Synthesis and polymerization of N-vinylindole

The reaction of indole with acetylene under pressure is investigated. It is shown that under the action of KOH in aqueous dioxane at 220° C, N-vinylindole C₁₀H₉N is formed in 66% yield, and that this compound undergoes free radical and cationic polymerization.     

Hydrolysis study of organic acid anhydrides by differential thermal analysis-I Pyromellitic dianhydride

A technique for following the hydrolysis of pyromellitic acid dianhydride (PMDA) by differential thermal analysis (DTA) is described. On exposure of PMDA to moisture, an endothennic peak is initiated between 190 and 200 degrees . As the degree of hydrolysis increases, this peak becomes more intense and shifts to higher temperatures. The formation of pyromellitic acid (PMA) during the hydrolysis of PMDA can be determined qualitatively by DTA.     

Effect of bases on 1,3,4-thiadazolo[3,2-a] pyrimidinium salts

1,3,4-Thiadiazolo[3,2-a]pyrimidinium salts are converted by the action of bases to 2-thiocyanopyrimidines, which were also obtained from 2-amino-1,3,4-thiadiazole and -diketones, thus bypassing the step involving the isolation of the pyrimidinum salts.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1660–1661, December, 1974.