Results 31 to 40 of about 115,311 (290)

The crystal structures of 6′-(4-chlorophenyl)- and 6′-(4-methoxyphenyl)-6a′-nitro-6a′,6b′,7′,9′,10′,12a′-hexahydro-2H,6′H,8′H-spiro[acenaphthylene-1,12′-chromeno[3,4-a]indolizin]-2-one

Acta Crystallographica Section E: Crystallographic Communications, 2019
In the title compounds, C32H25ClN2O4 (I) and C33H28N2O5 (II), the six-membered pyran and piperidine rings adopt envelope and chair conformations, respectively. The five-membered pyrrolidine rings adopt twist conformations. Compound (II) crystallizes with
S. Syed Abuthahir, M. NizamMohideen, V. Viswanathan, D. Velmurugan, J. Nagasivarao   +4 more
doaj   +1 more source

K₂CO₃-Promoted Formal [3+3]-Cycloaddition of N-Unsubstituted Isatin N,N′-Cyclic Azomethine Imine 1,3-Dipoles with Knoevenagel Adducts

Molecules, 2023
The synthesis of dicyclic spiropyridazine oxoindole derivatives by using [3+3]-cycloaddition of N-unsubstituted isatin N,N′-cyclic azomethine imine 1,3-dipoles was reported.
Guosheng Yang, Sicheng Li, Qiumi Wang, Huabao Chen, Chunping Yang, Zhongqiong Yin, Xu Song, Li Zhang, Cuifen Lu, Guizhou Yue   +9 more
doaj   +1 more source

A Stepwise [4 + 3] Cycloaddition Reaction of the 1,3-Diphenyl-2-azaallyl Anion [PDF]

, 1993
The 1,3-diphenyl-2-azaallyl anion (1) undergoes [3 + 2] cycloaddition reactions with the s-cis-fixed 1,3-dienes 8-11. In contrast, 1,1,2,2,3,3-hexamethyl-4,5-bis(methylene)cyclopentane (7) reacts with 1 to give the [4 + 3] cycloadduct 13 and the linear 1,
Anh, Baran, Baran, Baran, Baran, Baran, Blomquist, Boche, Boche, Bower, Eidenschink, Fleming, Huisgen, Juday, Kauffmann, Kauffmann, Kaufmann, Mayr, Mayr, Mayr, Mayr, van Straten, Wilcox, Woodward   +23 more
core   +1 more source

Cycloaddition of Azosulfones and Sulfonylimines [PDF]

Angewandte Chemie International Edition in English, 1966
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Effenberger, Franz, Maier, Roland
openaire   +3 more sources

Crystal structure of the 4 + 2 cycloadduct of photooxidized anthracene and C60 fullerene

Acta Crystallographica Section E, 2014
The structure of the title compound, 5,6-[(1R,10S)-2,9-dioxatricyclo[8.6.03,8.011,16]hexadecane-1,10-diyl]-(C60–Ih)[5,6]fullerene methanedithione 0.1-solvate, C74H10O2·0.1CS2, has tetragonal (P42/n) symmetry at 100 K. It has a unique eight-membered ring,
Gábor Bortel, Éva Kováts, Gábor Oszlányi, Sándor Pekker   +3 more
doaj   +1 more source

Halogenation effects in Intramolecular Furan Diels-Alder reactions:broad scope synthetic and computational studies [PDF]

, 2013
For the first time a comprehensive synthetic and computational study of the effect of halogen substitution on both furan and dienophile for the intramolecular Furan Diels-Alder (IMDAF) reaction has been undertaken.
Bebbington, Magnus William Paul, Paterson, Martin, Rae, Robert, Zurek, Justyna Marlena   +3 more
core   +1 more source

A Novel Ultra-High Swelling Organogel: An Epoxy Resin Derived Gelator for Alcohols and Polar Organic Liquids [PDF]

علوم و تکنولوژی پلیمر, 2020
Hypothesis: Organogels are hydrophobic macromolecular networks with ability to absorb and retain organic solvents. They have been used in various applications, e.g., production of disinfectant hygienic gels used in medicine and public health. The present
Zeinab Karami, Mohammad Jalal Zohuriaan-Mehr   +1 more
doaj   +1 more source

Promotion mechanism of hydroxyl groups in catalyzing CO2 cycloaddition

Journal of CO2 Utilization
In this study, a series of hydroxy-functionalized quaternary ammonium salt catalysts, i.e., NEt3(HE)Br, NEt2(HE)2Br, NEt1(HE)3Br, and N(HE)4Br, were successfully prepared by quantitatively grafting hydrogen-bond donors (HBDs) as electrophilic sites on ...
Yiming Wang, Wensheng Wei, Yuxin Wang, Guangwen Xu, Jinggang Zhao, Lei Shi   +5 more
doaj   +1 more source

Catalytic [4+2]- and [4+4]-cycloaddition using furan-fused cyclobutanone as a privileged C4 synthon

Nature Communications
Cycloaddition reactions play a pivotal role in synthetic chemistry for the direct assembly of cyclic architectures. However, hurdles remain for extending the C4 synthon to construct diverse heterocycles via programmable [4+n]-cycloaddition.
Kemiao Hong, Mengting Liu, Lixin Qian, Ming Bao, Gang Chen, Xinyu Jiang, Jingjing Huang, Xinfang Xu   +7 more
doaj   +1 more source

Intramolecular Cycloadditions of Cyclobutadiene with Olefins. [PDF]

ChemInform, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
John, Limanto, John A, Tallarico, James R, Porter, Kelli S, Khuong, K N, Houk, Marc L, Snapper   +5 more
openaire   +2 more sources