Search Results - "ring system"

Effect of hexagonal on the in-plane crushing behaviour of plain weave composite hexagonal quadruple ring system by Mahdi, E., Faraj, Munir, Hamouda, Abdel Magid Salem, Salit, Mohd Sapuan, Attia Hussein, Mohamed Ali, E. O., Eltai

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Synthesis of [5:5] pyrazolidinone and [5:7] oxazepanone γ-Lactam ring systems / Fatin Nur Ain Abdul Rashid by Abdul Rashid, Fatin Nur Ain

“…The second part focused on the formation of 3,4-fused [5:5] pyrazolidinone γ-lactam bicyclic ring system. The key intermediate; 2,3-dioxopyrrolidine underwent nucleophilic addition reaction at C-3 position via insertion of hydrazine hydrate by refluxing in ethanol solvent. …”
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Catalytic reforming of tar during gasification. Part III. Effects of feedstock on tar reforming using ilmenite as a catalyst by Min, Zhenhua, Yimsiri, P., Zhang, Shu, Wang, Yi, Asadullah, Mohammad, Li, Chun-Zhu

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Ethyl 1-sec-butyl-2-phenyl-1H-benzimidazole-5-carboxylate by Arumugam, Natarajan, Abdul Rahim, Aisyah Saad, Abd Hamid, Shafida, Hemamalini, Madhukar, Fun, Hoong-Kun

“…In the title molecule, C20H22N2O2, the benzimidazole ring system is essentially planar, with a maximum deviation of 0.024 (1) A ˚ . …”
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Adventures in natural product chemistry by Ward, Thomas E

“…Halichlorine, pinnaic acid and pinnarine are a novel family of marine alkaloids, characterised by their common 6-aza-spiro[4.5]decane ring system. First isolated in 1996 by Uemura et al, they have been shown to be biologically active with potential applications in the fields of inflammatory response and tumor metastasis. …”
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Ethyl 1-(2-hydroxyethyl)-2-phenyl-1H-benzimidazole-5-carboxylate by Hamzah, Nurasyikin, Abd Hamid, Shafida, Abdul Rahim, Aisyah Saad, Rosli, Mohd Mustaqim, Fun, Hoong-Kun

“…In each one, the benzimidazole ring system is essentially planar, with maximum deviations of There are two mol­ecules in the asymmetric unit of the title compound, C18H18N2O3. …”
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The atomization current and droplet size of ethanol in two different small-scale electro-spraying systems by Gan, Yunhua, Zhang, Xia, Li, Haige, Tong, Yang, Shi, Yanling, Yan, Yuying

“…Both of the nozzle and the nozzle-ring systems show a good agreement with Rayleigh instability.…”
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Studies towards the synthesis of 4-hydroxybenzyl 3-acyltetramic acid / Norhanim Mohalid by Mohalid, Norhanim

“…The tetramic acid (pyrrolidine-2,4-dione) ring system is present as a key structural unit in many natural products. …”
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Synthesis, Characterisation And Cytotoxicity Study Of Some New 1,2,4-Triazole Derivatives by Mohsin Slaihim, Mukhlif

“…Dalam kajian ini, 36 sebatian baru 1,2,4-triazol dengan sistem gelang mono dan terlakur telah disintesis dan dicirikan In this study, 36 new 1,2,4-triazole compounds with mono and fused ring system have been synthesised and characterised …”
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Isolation, structure elucidation and cytotoxic activity of cucurbitacins from Elaeocarpus petiolatus by Cho, Eun Seon

“…Compound 1 represents a rare cucurbitacin incorporating an unusual furan-bearing side chain with ketal and epoxide functions, while compound 2 possesses a rare six-fused ring system incorporating a pyranofuranyl ring system. …”
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On the influence of small chemical changes upon the supramolecular association in substituted 2-(phenoxy)-1,4-naphthoquinones by Tonin, Marlon D. L., Garden, Simon J., Jotani, Mukesh M., Wardell, James L., Tiekink, Edward R. T. *

“…X-ray crystallography reveals the common feature of the title compounds is a 1,4-naphthoquinone ring system with a substituted phenoxy residue adjacent to an oxo-group to give 1 (H), 2 (3-Br), 3 (3-CF3), 4 (4-CN) and 5 (4-NO2). …”
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Synthesis of spirocyclic enones by rhodium-catalyzed dearomatizing oxidative annulation of 2-alkenylphenols with alkynes and enynes by Kujawa, Szymon, Best, Daniel, Burns, David J., Lam, Hon Wai

“…These reactions are successful using Cu(OAc)2 or air as the stoichiometric oxidant, and provide spirocyclic enones, the basic ring system of which appears in several natural products. …”
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Catalytic performance of chars as catalyst for reforming pyrolytic tars from Shengli lignite pyrolysis by Wang, F., Chen, Z., Li, S., Zhang, Shu, Wang, Y.

“…In the presence of catalysts (especially the activated char), the tar production dropped while the propor tion of large aromatic ring system in tar also significantly changed. The tar yields were generally decreasing with increasing reaction temperatures from 700 to 900 °C, but the increase in temperature changed the tar chemical compositions differently between slow and fast heating rates.…”
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2-Quinolylmethyl N0-[1-(m-tolyl) ethylidene] hydrazinecarbodithioate by How, Fiona Ni Foong, Watkin, David J., Crouse, Karen Anne, Mohamed Tahir, Mohamed Ibrahim

“…The title compound, C20H19N3S2, crystallized as a cis–trans conformer in which the quinoline ring system is cis across the C—S bond but adopts a trans geometry with respect to the C—N bond. …”
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2-sec-Butyl-1-(2-hydroxyethyl)-1H-benzimidazole-5-carboxylic acid by Hamzah, Nurasyikin, Ngah, Nurziana, Abd Hamid, Shafida, Abdul Rahim, Aisyah Saad

“…In the title compound, C14H18N2O3, the carboxylic group is tilted by 12.00 (4)° with respect to the mean plane throught the benzimidazole ring system. The alcohol and carboxyl hydroxy groups are involved in intermolecular O-HO and O-HN hydrogen bonds, forming a two-dimensional network extending parallel the ab plane. …”
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Ethyl 1-(butan-2-yl)-2-(2-methoxyphenyl)- 1H-benzimidazole-5-carboxylate by Natarajan, Arumugam, Ngah, Nurziana, Osman, Hasnah, Abdul Rahim, Aisyah Saad

“…In the title compound, C21H24N2O3, the mean planes of the benzene ring and the benzimidazole ring system form a dihedral angle of 69.94 (7)�. The ethyl group atoms of the ethanoate fragment are disordered over two sets of sites, with refined occupancies of 0.742 (6) and 0.258 (6). …”
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S-Quinolin-2-ylmethyldithiocarbazate by How, Fiona Ni Foong, Watkin, David J., Crouse, Karen Anne, Mohamed Tahir, Mohamed Ibrahim

“…The planar quinoline ring system forms an angle of 67.7 (1) with the dithiocarbazate group. …”
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6-Cyanonaphthalen-2-yl 4-hexylbenzoate by Rahman, Md. Lutfor, Srinivasa, H. T., Mohd. Yusoff, Mashitah, Huey, Chong Kwong, Ching, Kheng Quah

“…In the major disorder component, the naphthalene ring system forms a dihedral angle of 68.6 (5)° with the benzene ring. …”
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9-Benzyl-6-benzylsulfanyl-9H-purin-2-amine by Hariono, Maywan, Wahab, Habibah A., Mei, Lan Tan, Rosli, Mohd Mustaqim, Razak, Ibrahim Abdul

“…In the title compound, C19H17N5S, the dihedral angles between the purine ring system (r.m.s. deviation = 0.009 A°) and the S-bound and methylene-bound phenyl rings are 74.67 (8) and 71.28 (7)°, respectively. …”
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A free radical approach to ring-D aromatic steroids by Stoker, Davey A.

“…We proposed that the precursors 117a-d would lead to the 6,6,6,6 ring-D aromatic steroid ring system (such as that found in the natural product nicandrenone 67), via a cascade of radical ring-forming reactions. …”
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