Medium-sized cyclophanes. XIII. Highly selective cycloisomerization reaction of [2.2]metacyclophanes to 1,2,3,3a,4,5-hexahydropyrenes induced by iodine
Quenched skeletal Ni as the effective catalyst for selective partial hydrogenation of polycyclic aromatic hydrocarbons
作者:Chengyun Liu、Zeming Rong、Zhuohua Sun、Yong Wang、Wenqiang Du、Yue Wang、Lianhai Lu
DOI:10.1039/c3ra44871a
日期:——
Quenched skeletal Ni is an active and selective catalyst for selective partial hydrogenation of polycyclicaromatichydrocarbons (PAHs). The molecular structure of PAHs significantly dominate the hydrogenation process and furthermore, the distribution of hydrogenated products.
The treatment of [2.2]metacyclophanes with aluminum chloride gave a variety of hydropyrenes as the results of dehydrogenation, cycloisomerization, and disproportionation reactions. With ethylaluminum dichloride, however, a highly selective reaction occurred to give trans-trans-1,2,3,3a,4,5,9,10,10a,10b-decahydropyrene. Revised structures were presented for cis-cis- and trans-trans-decahydropyrenes
作为脱氢、环异构化和歧化反应的结果,用氯化铝处理 [2.2] 间环芳烃会产生多种氢芘。然而,使用二氯化乙基铝时,发生了高度选择性的反应,生成反式-反式-1,2,3,3a,4,5,9,10,10a,10b-十氢芘。基于 13 C NMR 和 X 射线晶体学分析,提出了针对顺-顺-和反-反-十氢芘的修订结构。
Facile sonochemical synthesis of carbon nanotube-supported bimetallic Pt–Rh nanoparticles for room temperature hydrogenation of arenes
作者:Horng-Bin Pan、Chien M. Wai
DOI:10.1039/c1nj20028c
日期:——
Bimetallic Pt–Rh nanoparticles can be deposited uniformly on surfaces of carboxylate functionalized multi-walled carbonnanotubes (MWNTs) using a simple one-step sonochemical method. The bimetallicnanoparticle catalyst exhibits a strong synergistic effect relative to the individual Pt or Rh metal nanoparticles for catalytic hydrogenation of polycyclic aromatic hydrocarbons (PAHs), neat benzene and
The hydrocracking of phenanthrene, anthracene, pyrene, chrysene, and fluoranthene over moltensaltcatalysts at 400 °C in the batch autoclave systems was examined. The products were mainly identified by means of GC-MS, but the representative products were isolated by preparative GLC and characterized by using NMR, IR, UV, and mass spectrometry. Most of the isolated products are compounds not previously
Catalytic hydrogenation of 9H-fluorene (1), phenanthrene (2), 4H-cyclopenta[def ]phenanthrene (3), pyrene (4), and fluoranthene (5) was carried out over Raney nickel (W-7) at 323 K under 608 kPa of hydrogen. The order of the reaction rate was 5 > 4 > 3 > 2 > 1. The adsorption equilibrium constant of the substrates decreased in the order 4 ≥ 5 >> 2 > 3 >> 1.