Cyclo-oligomerization of Quinones. VI. The Synthesis and Cyclization of a Furohelicene.

Heterocyclic Nanographenes and Other Polycyclic Heteroaromatic Compounds: Synthetic Routes, Properties, and Applications

“… a Reagents and conditions: (a) NaCl·AlCl 3 , 140 °C; (b) Pd­[P­( t -Bu) 3 ] 2 , K 3 PO 4 , toluene, 80 °C; (c) pyrolysis (DSC scan); (d) ( n -Bu) 3 SnH, AIBN, toluene, reflux; (e) TFA, CHCl 3 , 45 min, 0 °C. …”

“…In a 1973 report by Hogberg, tetraphenylenotrifuran 162.2 was obtained by fusing the helicene precursor 162.1 with sodium chloroaluminate at 140 °C (Scheme 162). 958 Rajca et al explored analogous ring closures in a number of [7]helicenes, which yielded the corresponding quasi [8]circulenes (162.4, 162.6, and 162.8, Scheme 162). 898 In addition to tinand palladium-mediated couplings, compounds 162.6 and 162.8 could be efficiently obtained by pyrolysis carried out in a differential scanning calorimeter.…”

Biphenylenes. Part 33. Synthesis of bisbenzo[3,4]cyclobuta[1,2-b; 1′,2′-h]- and bisbenzo[3,4]cyclobuta[1,2-c; 1′,2′-g]-phenanthrene, and attempts to prepare planar derivatives of cyclo-octatetraene

“…C1,H9Br requires C, 63.7; H, 3.7%); 6 2.20 (s, CH,), 6.52 (s, 4-H), 6.57-6.72 (m, 5-, 6-, 7-, and 8-H, and 6.76 (s, 1-H). (23).-Butyl-lithium ( 1 . h in hexane; 1 ml) was added to a solution of 2-bromo-3methylbiphenylene (245 mg) in dry ether (25 ml) at -10 "C under nitrogen.…”

DFT and QTAIM study of the tetra-tert-butyltetraoxa[8]circulene regioisomers structure

“…They found that the tetraoxa [8]circulenes are thermally stable oxygencontaining aromatic compounds with a planar central cyclooctatetraene ring. In subsequent papers [2][3][4][5][6][7] they continued the study of the tetraoxa [8]circulenes by different experimental methods. The first DFT studies of the structure, UV-visible and vibrational spectra of the symmetric tetraoxa [8]circulene series ( Fig.…”

“…The symmetric tetraoxa [8]circulenes [1][2][3][4][5][6][7] attract the research interest as a promising electroluminescent material for organic light-emitting diodes (OLEDs) [8][9][10][11]. The first reliable structure description of the simplest symmetric tetraoxa [8]circulene (Fig.…”