Synthesis and conformational analysis of nitropolycyclic fluoranthenes
摘要:
Nitroarenes are ubiquitous environmental pollutants some of which exhibit mutagenic and tumorigenic activities. The first systematic investigation of the nitration reactions of the polycyclic fluoranthenes, a major class of nonalternant polyarenes, is described. The specific hydrocarbons studied were benz[e]acephenanthrylene (1), benz[a]aceanthrylene (2), indeno[1,2,3-cd]pyrene (3), indeno[1,2,3-hi]chrysene (4), dibenz[a,e]aceanthrylene (5), dibenz[a,j]aceanthrylene (6), and dibenz[e,k]acephenanthrylene (7). The nitration of all hydrocarbons, except 1, proceeded with remarkable regioselectivity to provide a single mononitro product. In the case of 1, 17 % of a second mononitro isomer was isolated. The structures of the resulting mononitrofluoranthenes (8-15) were fully characterized by analysis of their high-resolution COSY, long-range COSY, and NOESY NMR spectra and by comparison with the spectra of the parent hydrocarbons. The observed nitration sites of the polycyclic fluoranthenes were in excellent agreement with theoretical predictions made by the DEWAR-PI method based on the relative energies of the Wheland intermediates for substitutions at various ring positions. The availability of the complete H-1 chemical shift assignments of the nitropolycyclic fluoranthenes (8-15), together with those of the parent hydrocarbons (1-7) and their UV-visible spectral data, enabled the molecular conformations of the nitro groups to be probed.
Acephenanthrylenes from flash vacuum thermolysis of diarylmethylidenecycloproparenes
作者:Brian Halton
DOI:10.1016/j.tetlet.2005.12.047
日期:2006.2
Upon flashvacuumthermolysis at 750 °C fluorenylidenecyclopropa[b]naphthalene (1) undergoes opening of the three-membered ring and rearrangement to give a range of C24H14 polycyclic aromatic hydrocarbons. Dibenz[e.l]- and -[e.k]acephenanthrylene (7) and (12), respectively, have been identified while the plausible naphth[1,2-e]- and [2,3-e]acephenanthrylenes (9) and (14) were not detected. With di
在750℃下的闪蒸真空热解中,亚芴基亚环丙烷[ b ]萘(1)经历三元环的开环并重排,得到一系列C 24 H 14多环芳烃。Dibenz [ e。l ]-和-[ e。已分别鉴定出k ]对苯二甲苯(7)和(12),而未检测到可能的萘[1,2- e ]-和[2,3- e ]对苯二酚(9)和(14)。与二苯基亚甲基环丙烷[ b ]萘(2)环脱氢和重排也提供C 24 H 14多环;dibenz [ e。k ]对苯乙(12)被鉴定和dibenz [ a。e ]乙炔(15)是一种提议的产品。
Polycyclic fluoranthene hydrocarbons. 2. A new general synthesis
作者:Bongsup P. Cho、Ronald G. Harvey
DOI:10.1021/jo00235a005
日期:1987.12
680. The preparation of some naphthofluoranthenes and their quinones
作者:Neil Campbell、A. Marks、D. H. Reid
DOI:10.1039/jr9500003466
日期:——
CHO, BONGSUP P.;HARVEY, RONALD G., J. ORG. CHEM., 52,(1987) N 26, 5668-5678