5,8,16,19-Tetra-tert-butyl-6,17,23-trisdehydro[22]bi[10.10.2]annulene. A condensed nonbenzenoid aromatic system consisting of two 14.pi.-electron systems
5,8,16,19-Tetra-tert-butyl-6,17,23-trisdehydro[22]bi[10.10.2]annulene. A condensed nonbenzenoid aromatic system consisting of two 14.pi.-electron systems
Tetra-t-butylhexakisdehydro[18]annuleno[26]annulenedione, a key substance for the synthesis of tetra-t-butyloctakisdehydro[18]annuleno[18]annuleno[18]annulene has been synthesized. Formation of di-t-butyldifurotrisdehydro[18]annulene was observed on heating a solution of diformylmethylene derivative of the tetrakisdehydro[18]annulene.