1,4;8,11-Bisimino-[14]annulen

Alkylpyrroles and Related Compounds

“…), compared with the corresponding signals for (D15) (δ = 6-32 p.p.m.) (178) Delocalization of the 14 π-electron system is evident from the complex of NMR signals between δ = 8-4 and 7-7 p.p.m. ), is compatible with a paramagnetic ring current expected of the antiaromatic hydrazino-bridged [12]annulene.…”

“…and (D9) (δ = 5-85 p.p.m. (178) A stepwise synthesis, analogous to that employed in the synthesis of [18]annulene oxide disulphide, (179) has been used in the preparation of l,4-imino [18]annulene-7,10;13,16-disulphide (D24b). (174) The aromatic 1,4;8,1 l-bisimino [14]annulene (D21) has been synthesized from the 1,1-bipyrrole (D18) by standard cyclization procedures and the ultimate cleavage of the N-N bond.…”