A Direct Method to Access Substituted Pyreno[4,5‐c:9,10‐c′] difuran and its Analogues

Abstract

In this research, pyreno[4,5‐c:9,10‐c′]difuran and its analogues have been successfully synthesized through a one‐step reaction using the same precursor and their physicochemical properties were studied. UV/Vis, fluorescence and CV measurements illustrated that the inserted chalcogen atoms (O, S and Se) brought almost no change on the photochemical and electrochemical properties whereas TM‐2N‐CH3 exhibited more blue‐shifted fluorescence emission and simultaneously elevated HOMO energy level.

Recent Advances in Heterocyclic Nanographenes and Other Polycyclic Heteroaromatic Compounds

“…Schemes 173 and 177 below). 330 Fluorescence emission 164.6 was blue-shifted relative to the starting dibenzoylpyrene 164.5 as well as the chalcogen-containing analogues ( 173.3 , Scheme 173 , and 177.3 – 4 , Scheme 177 ).…”

“… Reagents and conditions: (a) 329 N 2 H 5 OH, pyridine, water, reflux, 3 h; (b) Zn, DCM, AcOH, rt, 3 h; (c) 330 HCOONH 3 CH 3 , 145 °C, 24 h. …”

“… Reagents and conditions: (a) 329 LiAlH 4 , Et 2 O, rt, 30 min; (b) 330 NaBH 4 , MeOH, rt, overnight; (c) 347 CsF, MeCN/THF, 40 °C, overnight. …”

“… Reagents and conditions: (a) 329 P 4 S 10 , NaHCO 3 , MeCN, reflux, 20 h; (b) 330 Lawesson’s reagent, reflux, overnight, in the dark; (c) Woollins’ reagent, reflux, 2 h, in the dark. …”

Pyridazine‐Containing Diazatwistanthracene and Tetraazatwisttetracene: Synthesis, Crystal Structures and Third Order Non‐linear Optical Properties

“…Compound 2 and 4 were prepared with an optimized method. [46,47] Actually, compounds 1 and 3 are unstable, which are easy to be decomposed and oxidized to be compounds 2 and 4 under heating with the yields of 59% and 39%, respectively. The target compounds DPPA and TPPA were formed on the condensation of hydrazine with 2 and 4 with the yields of 49% and 58%, respectively.…”