Gas‐Phase Synthesis of Triphenylene (C
<sub>18</sub>
H
<sub>12</sub>
)
作者:Long Zhao、Bo Xu、Utuq Ablikim、Wenchao Lu、Musahid Ahmed、Mikhail M. Evseev、Eugene K. Bashkirov、Valeriy N. Azyazov、A. Hasan Howlader、Stanislaw F. Wnuk、Alexander M. Mebel、Ralf I. Kaiser
DOI:10.1002/cphc.201801154
日期:2019.3.18
triphenylene (C18H12) – via an unconventional hydrogen abstraction–vinylacetylene addition (HAVA) mechanism operational at temperatures as low as 10 K. The barrier‐less, exoergic nature of the reaction reveals HAVA as a versatile reactionmechanism that may drive molecular mass growth processes to PAHs and even two‐dimensional, graphene‐type nanostructures in cold environments in deep space thus leading
在过去的几十年中,广泛采用了吸氢乙炔加氢(HACA)机制,以合理化碳质陨石(CM)中检测到的PAHs的高温合成,并提出存在于星际介质(ISM)中。通过揭示9菲基([C 14 H 9 ] 。)与乙烯基乙炔(C 4 H 4)的化学性质,我们提供了第一个令人信服的证据,表明无障碍途径导致了原型四环PAH –三亚苯基(C 18小时12)–通过非常规的氢提取-乙烯基乙炔加成(HAVA)机制可在低至10 K的温度下运行。反应的无障碍,能热性质表明HAVA是一种通用的反应机制,可推动分子质量增长过程向PAHs和甚至在深空寒冷环境中的二维石墨烯型纳米结构,也可以通过在最基本的层面上解开基本反应来更好地理解我们宇宙中的碳化学。
Synthesis and spectroscopy of nine isomeric methylacephenanthrylenes
作者:Patrick P. J. Mulder、Ben B. Boere、Arthur Baart、Jan Cornelisse、Johan Lugtenburg
DOI:10.1002/recl.19931120105
日期:——
dehydration and, in the case of 1g and 1j, dehydrogenation. 8- And 9-methylacephenanthrylene (1h and 1i) were prepared by a Haworth synthesis starting with the reaction of methylsuccinic anhydride with acenaphthene. The spectroscopic properties of acephenanthrylene and its methyl derivatives were investigated with mass spectrometry, 1H NMR and UV-VIS spectroscopy. According to the 1H NMR spectra, steric
描述了九种异构的甲基取代的对苯二甲苯的合成。使用了三种不同的方法。通过对苯二酚(2)和4,5,7,8,9,10-六氢对苯二甲酸(17)的甲酰化反应制得1-,2-和6-甲基对苯二甲苯(1a,1c和1f)),然后进行Wolff-Kishner还原和脱氢反应。通过用甲基锂处理相应的苯乙酮,然后进行脱水,然后脱水,在1g和1j的情况下进行脱氢,从而合成4-,5-,7-和10-甲基对苯二甲苯(1d,1e,1g和1j)。通过Haworth合成,从甲基琥珀酸酐与的反应开始,制备8-和9-甲基苯并菲(1h和1i)。通过质谱,1 H NMR和UV-VIS光谱研究了对苯乙撑及其甲基衍生物的光谱性质。根据1 H NMR光谱,甲基和附近质子之间的空间位阻按以下顺序减小:1、10> 6> 7> 3> 4、5、8、9。
Aryl−Aryl Bond Formation by Flash Vacuum Pyrolysis of Benzannulated Thiopyrans
作者:Aaron W. Amick、Atsushi Wakamiya、Lawrence T. Scott
DOI:10.1021/jo800379x
日期:2008.7.1
heterocycles (thiepines), some of which extrude sulfur and give the ring-contracted hydrocarbon even at room temperature in solution, benzannulated thiopyrans (6-membered sulfur heterocycles) require flashvacuumpyrolysis (FVP) conditions in the gas phase at temperatures in the range of 1000−1200 °C to promote the corresponding reaction. Thus, FVP of benzo[kl]thioxanthene (1) gives fluoranthene, and naphtho[2
Unexpected High Temperature Behaviour of 2,2′-Diethynylbiphenyl in the Gas Phase – a Precursor for Acephenanthrylene Instead of Pyrene
作者:Martin Sarobe、Rieko van Heerbeek、Leonardus W. Jenneskens、Jan W. Zwikker
DOI:10.1002/jlac.199719971212
日期:1997.12
Flash Vacuum Thermolysis (FVT) of 2,2′-diethynylbiphenyl (6) gave, instead of pyrene (5), acephenanthrylene (10) and fluoranthene (11) as major products. The unequivocal identification of 9-ethynylphenanthrene (12) at T ⩽ 800 °C suggests that 12 is the initial stable product derived from 6. It is documented that under high-temperature conditions in the gas phase compound 12 is efficiently converted
The ethyne-ethylidene rearrangement: Formation of Indeno[2,1-a]indene and fluoranthene on flash vacuum pyrolysis of 1,4-diphenylbutadiyne
作者:Roger F.C. Brown、Frank W. Eastwood、Neil R. Wong
DOI:10.1016/s0040-4039(00)73648-3
日期:1993.5
Diphenylbutadiyne on flash vacuum pyrolysis at 1120°/0.03 Torr gave a pyrolysate (22% mass recovery) consisting of the diyne (7%), indeno[2,1-a]indene (19%), fluoranthene (59%), acephenanthrylene (13%) and aceanthrylene (2%). It is proposed that indeno[1,2-a]indene is formed via 3-phenyl-1,2-didehydronaphthalene and fluoranthene via-phenyl-2,3-didehydronaphthalene.
于1120°/ 0.03 Torr进行快速真空热解的二苯基丁二炔产生了热裂解物(质量回收率为22%),由二炔(7%),茚并[2,1- a ]茚(19%),荧蒽(59%)和对苯二酚组成(13%)和乙炔(2%)。所以建议茚并[1,2一]茚形成经由3-苯基-1,2- didehydronaphthalene和荧蒽通过-苯基-2,3- didehydronaphthalene。