Thiophen derivatives. Part XXI. New nitrogen-containing heterocyclic systems from 5-aminobenzo[b]thiophen
Abstract
Benzo-derivatives of the new heterocyclic systems thieno[3,2-a]acridine, dithieno[3,2-b][3,2-f]quinoline, and thieno[3,2-a]phenarsazine have been prepared from 5-aminobenzo[b]thiophen.