Syntheses of the group 15 1-benzoheteroepines, dibenzo[b,d]heteroepines and dibenzo[b,f]heteroepines involving the first isolated examples of arsepines and bismepines

Abstract

The C-unsubstituted fully unsaturated Group 15 (P, As, Sb and Bi) 1-benzoheteroepines 6, dibenzo[b,d]heteroepines 8 and dibenzo[b,f] heteroepines 10 have been prepared from the dibromo compounds 3, 7 and 9 having a 1,6-dibromohexatriene system, and their thermal stabilities have been examined.