Electrophilic substitution in a series of derivatives of 5,6,7,8-tetrahydro-2a,4a-diazacyclopenta[c,d]azulene

Protonation, acylation, nitrosation, and addition of iso(thio)cyanates occur readily at position two of 1,4-diaryl-5,6,7,8-tetrahydro-2a,4a-diazacyclopenta[c,d]azulenes.T. G. Shevchenko Chernigov Pedagogical Institute, Chernigov 250038. Taras Shevchenko Kiev University, Kiev 252017. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 904–908, July, 1997.