- Diels-Alder reactions of arylethenes. Synthesis of some [5]phenacenes and fluorenoanthracenes
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A one-pot high yielding route to 3,4-dihydro-1-(2H)-anthracenone (9) based on high pressure Diels-Alder reaction is described. The synthesis of 3,4-dihydro-1-vinylphenanthrene (1) and 3,4-dihydro-1-vinylanthracene (2) is reported. A new synthetic two-step approach to [5]phenacenes and fluorenoanthracenes has been developed. It is based on the Diels-Alder reaction of arylethenes 1 and 2 with benzyne (13), 1,4-benzoquinone (14), 1,4-naphthoquinone (15) and inden-1-one (17) and on the aromatization of the cycloadducts. Structure analysis of the reaction products by 1H and 13C- NMR spectroscopy is presented.
- Minuti, Lucio,Taticchi, Aldo,Gacs-Baitz, Eszter,Marrocchi, Assunta
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- 3,3′,5,5′-Tetra- tert -butyl-4,4′-diphenoquinone (DPQ)-Air as a New Organic Photocatalytic System: Use in the Oxidative Photocyclization of Stilbenes to Phenacenes
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We report an organic photocatalytic system, namely 3,3′,5,5′-tetra-tert-butyl-4,4′-diphenoquinone (DPQ) and air, capable of coupling efficiently with the photocyclization of stilbenes to afford phenacenes. The potential of this new and mild process is shown with the synthesis of [5]- and [7]phenacene, two semiconductors recently implemented into organic electronic devices, with high yields and remarkable purity.
- Carrera, Manuel,De La Viuda, Mónica,Guijarro, Albert
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- Preparation of (substituted) picenes via solar light-induced Mallory photocyclization
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Picenes 2a-c were readily obtained via photocyclization of dinaphthylethenes 1a-c by a straightforward solar light-induced Mallory reaction. The product was easily recovered by simple filtration after exposure of the reaction mixture to sunlight. The polyene obtained was then characterized by means of Raman spectroscopy and X-ray diffraction.
- Protti, Stefano,Artioli, Gianluca A.,Capitani, Francesco,Marini, Carlo,Dore, Paolo,Postorino, Paolo,Malavasi, Lorenzo,Fagnoni, Maurizio
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- Oxidative, Iodoarene-Catalyzed Intramolecular Alkene Arylation for the Synthesis of Polycyclic Aromatic Hydrocarbons
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A catalytic, metal-free and chemoselective oxidative intramolecular coupling of arene and alkene C?H bonds is reported. The active hypervalent iodine (HVI) reagent, generated catalytically in situ from iodotoluene and meta-chloroperoxybenzoic acid (m-CPBA), reacts with o-vinylbiphenyls to generate polyaromatic hydrocarbons in up to 95 % yield. Experimental evidence suggests the reactions proceed though vinyliodonium and, possibly, vinylenephenonium intermediates.
- Zhao, Zhensheng,Britt, Liam H.,Murphy, Graham K.
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p. 17002 - 17005
(2018/11/01)
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- Sandwich complexes of iron and ruthenium with the semiconducting aromatic hydrocarbon picene
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Pentacyclic aromatic hydrocarbon picene C22H14 was synthesized by the improved two-step procedure from 1-naphthaldehyde in ca. 50% total yield. Reaction of picene with ferrocene in the presence of AlCl3 produced the binucl
- Shved, Andrei M.,Nelyubina, Yulia V.,Perekalin, Dmitry S.
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- Convenient Phenacene Synthesis by Sequentially Performed Wittig Reaction and Mallory Photocyclization Using Continuous-Flow Techniques
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Various phenacenes possessing chrysene, picene, and fulminene frameworks were prepared by using a continuous-flow synthetic protocol in which Wittig reaction affording diarylethenes and their Mallory photocyclization producing phenacene skeletons were sequentially performed. The Wittig reaction solution, containing the diaryl ethene obtained from an arylaldehyde and an arylmethyltriphenylphosphonium salt, was mixed with an iodine solution in the flow system and, subsequently, the solution was subjected to the photoreaction. Desired phenacenes were obtained with high to moderate chemical yield. For the present protocol, isolation of the intermediary diarylethene, which is the key precursor of the phenacene, is unnecessary. The approach provides a convenient method to supply a variety of phenacene samples, which are needed for initial systematic surveys in material science.
- Okamoto, Hideki,Takahashi, Haruhiko,Takane, Takamitsu,Nishiyama, Yasuhiro,Kakiuchi, Kiyomi,Gohda, Shin,Yamaji, Minoru
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p. 2949 - 2957
(2017/06/27)
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- Polycyclic Aromatic Hydrocarbons via Iron(III)-Catalyzed Carbonyl-Olefin Metathesis
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Polycyclic aromatic hydrocarbons are important structural motifs in organic chemistry, pharmaceutical chemistry, and materials science. The development of a new synthetic strategy toward these compounds is described based on the design principle of iron(III)-catalyzed carbonyl-olefin metathesis reactions. This approach is characterized by its operational simplicity, high functional group compatibility, and regioselectivity while relying on FeCl3 as an environmentally benign, earth-abundant metal catalyst. Experimental evidence for oxetanes as reactive intermediates in the catalytic carbonyl-olefin ring-closing metathesis has been obtained.
- McAtee, Christopher C.,Riehl, Paul S.,Schindler, Corinna S.
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supporting information
p. 2960 - 2963
(2017/03/11)
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- Production of [pisen[pisen] and derivatives thereof
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PROBLEM TO BE SOLVED: To provide a method of producing a picene and a derivative thereof suitable for uses of organic semiconductors, thin film transistors, field effect transistors or solar batteries or the like, in a short reaction process with high yield.SOLUTION: A method of producing a picene of formula 8 and a derivative thereof includes, as represented compounds and steps, a step 1 to subject a compound of formula 5 and a compound of formula 6 to a coupling reaction for producing a compound of formula 7, and a step 2 to subject the compound of formula 7 to dehydrohalogenation.
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Paragraph 0040
(2017/07/07)
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- Base-Promoted/Gold-Catalyzed Intramolecular Highly Selective and Controllable Detosylative Cyclization
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A highly selective, controllable and synthetically useful base-promoted intramolecular detosylative cyclization of bis-N-tosylhydrazones has been achieved, affording N-containing heterocycles and cyclic olefins under transition-metal-free or gold-catalyzed procedures, respectively. Moreover, an effective and practical metal-free or gold-catalyzed approach to synthesize polycyclic aromatic compounds is also reported. Basic cyclizations: A highly selective, controllable, and synthetically useful base-promoted intramolecular detosylative cyclization of bis-N-tosylhydrazones affords N-containing heterocycles and cyclic olefins under transition-metal-free or gold-catalyzed procedures, respectively. Moreover, an effective and practical metal-free or gold-catalyzed approach to synthesize polycyclic aromatic compounds is also reported.
- Zhu, Chenghao,Qiu, Lin,Xu, Guangyang,Li, Jian,Sun, Jiangtao
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supporting information
p. 12871 - 12875
(2015/09/07)
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- Efficient synthetic photocyclization for phenacenes using a continuous flow reactor
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The continuous flow reaction technique has been applied to the photocyclization of 1,2-diarylethenes, the so-called Mallory reaction, to afford phenacenes in high chemical yields and efficiencies (114-288mg h-1). The present technique will allow us to produce several grams of phenacenes at a time.
- Okamoto, Hideki,Takane, Takamitsu,Gohda, Shin,Kubozono, Yoshihiro,Sato, Kaori,Yamaji, Minoru,Satake, Kyosuke
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p. 994 - 996
(2014/07/22)
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- Synthesis of substituted picenes through Pd-catalyzed cross-coupling reaction/annulation sequences and their physicochemical properties
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A novel and versatile synthetic method for picene derivatives is developed using the Pd-catalyzed intramolecular double cyclization of the corresponding 2,3-bis[(1Z)-2-phenylethenyl]-1,4-dichlorobenzenes, which are readily prepared by Suzuki-Miyaura cross-coupling reactions of polyhalobenzenes with (Z)-arylethenylboronates. The physical properties of the obtained picenes can be modified via introducing a variety of functional groups to the picene framework. All compounds are investigated by UV-vis and fluorescence spectroscopic measurements, CV, and DFT calculations as well as X-ray diffraction analysis.
- Chang, Ning-Hui,Chen, Xi-Chao,Nonobe, Hikaru,Okuda, Yasuhiro,Mori, Hiroki,Nakajima, Kiyohiko,Nishihara, Yasushi
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supporting information
p. 3558 - 3561
(2013/08/23)
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- Rhodium(II)-catalyzed cyclization of bis(N-tosylhydrazone)s: An efficient approach towards polycyclic aromatic compounds
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Ahead of the PAC: Polycyclic aromatic compounds (PACs) can be easily accessed by the combination of Suzuki-Miyaura cross-coupling and a [Rh 2(OAc)4]-catalyzed carbene reaction using easily available bis(N-tosylhydrazone)s as intermediates (see scheme; Ts=4-toluenesulfonyl). Copyright
- Xia, Ying,Liu, Zhenxing,Xiao, Qing,Qu, Peiyuan,Ge, Rui,Zhang, Yan,Wang, Jianbo
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supporting information; experimental part
p. 5714 - 5717
(2012/07/28)
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- Facile synthesis of picene from 1,2-Di(1-naphthyl)ethane by 9-fluorenone-sensitized photolysis
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A facile formation of picene was achieved by photosensitization of 1,2-di(1-naphthyl)ethane using 9-fluorenone as a sensitizer. This sensitized photoreaction is the first photochemical cyclization of ethylene-bridged naphthalene moieties to afford the picene skeleton. 5,8-Dibromopicene, prepared by this procedure using 1,2-di[1-(4-bromonaphthyl)]ethane as the substrate, was readily converted to novel functionalized picenes by conventional substitution and cross-coupling reactions.
- Okamoto, Hideki,Yamaji, Minoru,Gohda, Shin,Kubozono, Yoshihiro,Komura, Noriko,Sato, Kaori,Sugino, Hisako,Satake, Kyosuke
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supporting information; experimental part
p. 2758 - 2761
(2011/06/26)
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- Synthesis of substituted benzene derivatives by homo- and hetero-coupling of 2-bromobenzaldehyde and bromovinylaldehydes followed by McMurry coupling
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A convenient synthetic approach to substituted benzene derivatives by modified Ullmann cross-coupling of 2-bromobenzaldehyde and bromovinylaldehydes followed by intramolecular McMurry coupling has been developed.
- Some, Surajit,Dutta, Bishnupada,Ray, Jayanta K.
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p. 1221 - 1224
(2007/10/03)
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- Evolution of products in the combustion of scrap tires in a horizontal, laboratory scale reactor
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A horizontal laboratory reactor was used to study the evolution of byproducts from the combustion of scrap tires at five nominal temperatures (ranging from 650 to 1050 °C) and different oxygen:sample ratios A model was used to calculate the bulk air ratio (λ), and the oxygen consumption was discussed considering this ratio λ. More than 100 volatile and semivolatile compounds were identified and quantified by gas chromatography mass spectrometry, plotting their yields vs the bulk air ratio and temperature. Five different behaviors considering the bulk air ratio and the temperature were identified.
- Fullana,Font,Conesa,Blasco
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p. 2092 - 2099
(2007/10/03)
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- Characterization of the combustion products of polyethylene
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Polyethylene (PE) was burned in a tube-type furnace with an air flow at a temperature of 600~900°C. Combustion products were collected with glass wool, glass fiber filter, and XAD-2 adsorbent. The analysis of the products was performed with GC-FID and GC-MSD. At low temperature, hydrocarbons were the major components, while at higher temperature the products were composed of polycyclic aromatic hydrocarbons. With the high performance of the Hewlett-Packard 6890GC-5973MSD, more compounds were identified in comparison with previous studies.
- Piao, Mingjun,Chu, Shaogang,Zheng, Minghui,Xu, Xiaobai
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p. 1497 - 1512
(2007/10/03)
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- A New General Synthesis of Polycyclic Aromatic Compounds Based on Enamine Chemistry
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Alkylation of enamines and enamine salts by benzylic and (β-haloethyl)aryl halides, respectively, followed by acidic cyclodehydration and dehydrogenation provides an efficient synthetic approach to a wide range of polycyclic aromatic compounds of diverse structural types.Specific polycyclic hydrocarbons synthesized by this route include benzo- and benzofluorene, 7H-dibenzo-, 13H-dibenzo-, and 13H-dibenzofluorene, 15H-tribenzofluorene, dibenzochrysene, benzopentaphene, indenofluorene, fluorenofluorene, octahydrodibenzanthracene, dibenzanthracene, octahydrodibenzanthracene, dibenzanthracene, picene, benzopicene, 1H-benzaceanthrylene, and 4H-cyclopentachrysene.This method with appropriate modifications appears to be potentially broader in scope than established traditional methods of polycyclic hydrocarbon synthesis.
- Harvey, Ronald G.,Pataki, John,Cortez, Cecilia,Raddo, Pasquale Di,Yang, ChengXi
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p. 1210 - 1217
(2007/10/02)
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- SPECTROSCOPIC INVESTIGATION OF MOLECULAR ASSOCIATION AND PHOTOCHEMICAL REACTION PROCESSES IN ARYL ETHYLENES AND SOME OTHER COMPOUNDS.
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An attempt to clarify the conditions under which association of aryl ethylene molecules occurs is described.
- Nizamov,Astanov,Alfimov,Atakhodzhaev
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p. 209 - 213
(2007/10/02)
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