Results 51 to 60 of about 3,594 (226)

Dibenzosuberene‐Winged Polycyclic Aromatic Hydrocarbons

European Journal of Organic Chemistry, EarlyView.
The twisted acene 8, which features two dibenzosuberene “wings”, was prepared by the addition of a crowded aryne to a similarly “winged” cyclopentadienone. Compound 8 is chiral, and it has a high barrier to thermal racemization (ΔG‡rac = 36 kcal/mol), but it undergoes fast photochemical racemization even in ambient light.
Mingshu Xie, Xiaodong Zhang, Michael W. Johnson, Robert A. Pascal Jr   +3 more
wiley   +1 more source

Multivariate relationship of methyl- and dimethyl-phenanthrenes to the maturity of organic matter in sedimentary sequences

Energy Exploration & Exploitation
At least thirteen parameters relating phenanthrene and methylated phenanthrenes to the maturity of organic matter have been defined in the literature and a mass of the data have been accumulated. However, these parameters are not always effective in many
Xiaotian Huang, Liuping Zhang, Bangjun Liu, Kun Zhang, Zhaoyang Li   +4 more
doaj   +1 more source

Thermal maturity assessment of some Egyptian crude oils as implication from naphthalene, phenanthrene and alkyl substituents

Egyptian Journal of Petroleum, 2021
The study is paying attention to the variation of the comparative abundance of naphthalenes, phenanthrenes of aromatic fractions separated from seven different Egyptian crude oils, and were studied by GC–MS to assess the thermal maturity and recognize ...
Eman S. Abdullah, Mohamed A. Ebiad, Ahmed M. Rashad, Mohamed M. El Nady, Seham M. El-Sabbagh   +4 more
doaj   +1 more source

The development of flow photochemical methods for the synthesis of Phenanthrenes, Helicenes and Benzochromenes

, 2022
This thesis focuses on the development of flow photochemical methods, for the synthesis of phenanthrenes, helicenes and benzochromenes. Chapter 1 reviews the literature of triplet aryl cations, which are rarely discussed intermediates in synthetic ...
Wilding-Steele, Luke
core  

Pt/C‐Catalyzed Deuteration of Polycyclic Aromatic Hydrocarbons with Suppressed Arene Hydrogenation

European Journal of Organic Chemistry, EarlyView.
An additive‐enabled Pt/C protocol promotes hydrogen–deuterium exchange in fused polycyclic aromatic hydrocarbons (PAHs) in D2O/2‐PrOH at 80 °C. Decalin suppresses undesired ring hydrogenation while accelerating on‐ring H–D exchange, furnishing highly deuterated PAHs (PAHs‐dn).
Naoya Sakurada, Sae Tomoto, Naoki Oka, Tomohiro Ichikawa, Takashi Shigeta, Hironao Sajiki, Takashi Ikawa   +6 more
wiley   +1 more source

Phenanthrenes from as Novel Phosphodiesterase-5 Inhibitors

Natural Product Communications, 2017
Phosphodiesterase 5 (PDE5) inhibitors can be used for the treatment of erectile dysfunction and pulmonary hypertension. In order to search for new leads of PDE5 inhibitors, we investigated the chemical constituents of the tubers of Eulophia macrobulbon ...
Prapapan Temkitthawon, Kanokwan Changwichit, Nantaka Khorana, Jarupa Viyoch, Khanit Suwanborirux, Kornkanok Ingkaninan   +5 more
doaj   +1 more source

Extensive Phytochemical Assessment of Hook (Orchidaceae)

Natural Product Communications, 2022
Dendrobium fimbriatum Hook is an important medicinal and ornamental orchid that may lead to important drugs and cosmetics. In this study, 2 analytical strategies were combined to describe the detailed composition of a hydroethanolic extract of the whole ...
Quentin Favre-Godal, Jane Hubert, Alexis Kotland, Delphine Garnier, Camille Beaugendre, Lorène Gourguillon, Aurelie Urbain, Sonia Lordel-Madeleine, Patrick Choisy   +8 more
doaj   +1 more source

Traditional Uses, Phytochemistry, Pharmacology, and Quality Control of Dendrobium officinale Kimura et. Migo

Frontiers in Pharmacology, 2021
Dendrobium officinale, a well-known plant used as a medicinal and food homologous product, has been reported to contain various bioactive components, such as polysaccharides, bibenzyls, phenanthrenes, and flavonoids.
Wenhua Chen, Jiemiao Lu, Jiahao Zhang, Jianjun Wu, Lilong Yu, Luping Qin, Bo Zhu   +6 more
doaj   +1 more source

Palladium-Catalyzed Cocyclotrimerization of Allenes with Arynes: Selective Synthesis of Phenanthrenes

, 2016
Palladium-catalyzed cocyclotrimerization of allenes with arynes has been developed for selectively synthesizing phenanthrenes. In the presence of [(allyl)PdCl]2 and P(o-tol)3, a variety of allenes, including internal and terminal allenes, underwent the ...
Shao-Feng Pi (2297335), Xiao-Cheng Huang (1848718), Jin-Heng Li (1457626), Yun Liang (383275), Yi-Lin Liu (2358193)   +4 more
core   +1 more source

Ueber Phenanthren [PDF]

Justus Liebigs Annalen der Chemie, 1873
n ...
openaire   +1 more source