95-93-2Relevant articles and documents
Damude,Dean
, p. 1083 (1978)
Picosecond Transient Absorption Measurements of Geminate Electron-Cation Recombination
Braun, Charles L.,Smirnov, Sergei N.,Brown, Steven S.,Scott, T. W.
, p. 5529 - 5532 (1991)
Durene (1,2,4,5-tetramethylbenzene) dissolved in n-hexane was photoionized by 35-ps light pulses at 266 nm.Transient absorption at 1064 nm arising chiefly from geminate electrons was detected and used to monitor the recombination of the electron-cation pairs produced by two-photon ionization.An excellent fit to the recombination kinetics at 208 K was obtained by assuming that the distribution of initial electron-cation separations was of the form r2EXP=r2/(2L3)exp(-r/L) with a mean radius 3L = 5.7 nm.
Selective Production of Renewable para-Xylene by Tungsten Carbide Catalyzed Atom-Economic Cascade Reactions
Dai, Tao,Li, Changzhi,Li, Lin,Zhao, Zongbao Kent,Zhang, Bo,Cong, Yu,Wang, Aiqin
supporting information, p. 1808 - 1812 (2018/02/10)
Tungsten carbide was employed as the catalyst in an atom-economic and renewable synthesis of para-xylene with excellent selectivity and yield from 4-methyl-3-cyclohexene-1-carbonylaldehyde (4-MCHCA). This intermediate is the product of the Diels–Alder reaction between the two readily available bio-based building blocks acrolein and isoprene. Our results suggest that 4-MCHCA undergoes a novel dehydroaromatization–hydrodeoxygenation cascade process by intramolecular hydrogen transfer that does not involve an external hydrogen source, and that the hydrodeoxygenation occurs through the direct dissociation of the C=O bond on the W2C surface. Notably, this process is readily applicable to the synthesis of various (multi)methylated arenes from bio-based building blocks, thus potentially providing a petroleum-independent solution to valuable aromatic compounds.
Coupling of Methanol and Carbon Monoxide over H-ZSM-5 to Form Aromatics
Chen, Zhiyang,Ni, Youming,Zhi, Yuchun,Wen, Fuli,Zhou, Ziqiao,Wei, Yingxu,Zhu, Wenliang,Liu, Zhongmin
supporting information, p. 12549 - 12553 (2018/09/11)
The conversion of methanol into aromatics over unmodified H-ZSM-5 zeolite is generally not high because the hydrogen transfer reaction results in alkane formation. Now circa 80 % aromatics selectivity for the coupling reaction of methanol and carbon monoxide over H-ZSM-5 is reported. Carbonyl compounds and methyl-2-cyclopenten-1-ones (MCPOs), which were detected in the products and catalysts, respectively, are considered as intermediates. The latter species can be synthesized from the former species and olefins. 13C isotope tracing and 13C liquid-state NMR results confirmed that the carbon atoms of CO molecules were incorporated into MCPOs and aromatic rings. A new aromatization mechanism that involves the formation of the above intermediates and co-occurs with a dramatically decreased hydrogen transfer reaction is proposed. A portion of the carbons in CO molecules are incorporated into aromatic, which is of great significance for industrial applications.