catalysis tops that of the hitherto most active molecular group 2 metal catalysts. Depending on the substrate, two different catalytic cycles are proposed. A: a classical metal hydride cycle and B: the Ba metal cycle. The latter is proposed for substrates that are easily reduced by Ba0, that is, conjugated alkenes, alkynes, annulated rings, imines and pyridines. In addition, a mechanism in which Ba0 and BaH2
series of bulky alkalineearth (Ae) metal amide complexes have been prepared: Ae[N(TRIP)2 ]2 (1-Ae) and Ae[N(TRIP)(DIPP)]2 (2-Ae) (Ae=Mg, Ca, Sr, Ba; TRIP=SiiPr3 , DIPP=2,6-diisopropylphenyl). While monomeric 1-Ca was already known, the new complexes have been structurally characterized. Monomers 1-Ae are highly linear while the monomers 2-Ae are slightly bent. The bulkier amide complexes 1-Ae are by far
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。
The Hydrocracking of Polynuclear Aromatic Hydrocarbons over Molten Salt Catalysts
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