ChemInform Abstract: Cycloadditions of 2,8,11-Triphenyl-7,9,10,11b-tetraazanaphth(1,2,3-cd) azulene and 2,8,10-Triphenyl-9-oxa-7,10b-diazaindeno(4,5,6-cd)azulene with Dimethyl Acetylenedicarboxylate

Cycloadditions of the title compounds with dimethyl acetylenedicarboxylate gave 1:2-cycloadducts. The structural assignments of the products were deduced by spectral inspections; the structure for one compound was established by X-ray crystallography.