Carcinogenic nitrogen compounds. Part LXXVIII. Some indeno-[1,7-bc]-, benz[a]indeno[7,1-hi]-, and benz[c]indeno[7,1-hi]-acridines
The synthesis is recorded of a number of indeno[1,7-bc]-, benz[a]indeno[7,1-hi]-, and benz[c]indeno[7,1-hi]-acridines by the Ullmann–Fetvadjian and Bernthsen reactions. In the course of this work, the iodine-catalysed condensation of 1-naphthol with 5-aminoacenaphthene was unexpectedly complex, leading to di-(5-acenaphthyl)-amine and 4,5,9,10-tetrahydroindeno[1,7-bc]indeno[7,1-hi]acridine, besides the normal product.