Results 11 to 20 of about 851,331 (355)

New five membered ring chemistry [PDF]

, 1959
Edward Felix Zaweski
core   +6 more sources

1-Azirine Ring Chemistry

Chemischer Informationsdienst, 1977
AbstractSynthese und Reaktionen von 1‐Azirinen werden untersucht.
Vasu Nair, Ki Hyup Kim
openalex   +3 more sources

Imaging the Photochemical Ring-Opening of 1,3-Cyclohexadiene by Ultrafast Electron Diffraction [PDF]

, 2018
The ultrafast photoinduced ring-opening of 1,3-cyclohexadiene constitutes a textbook example of electrocyclic reactions in organic chemistry and a model for photobiological reactions in vitamin D synthesis. Here, we present direct and unambiguous observation of the ring-opening reaction path on the femtosecond timescale and sub-{\AA}ngstr\"om length ...
Centurion, M., Coffee, R., Cryan, J. P., Gühr, M., Hegazy, K., Kirrander, A., Li, R. K., Martínez, T. J., Minitti, M. P., Nunes, J.P.F., Parrish, R. M., Ruddock, J., Sanchez, D. M., Shen, X., Vecchione, T., Wang, X. J., Weathersby, S. P., Weber, P. M., Wilkin, K., Wolf, T. J. A., Yang, J., Yong, H., Zheng, Q.   +22 more
arxiv   +5 more sources

Supersymmetry and the Hartmann Potential of Theoretical Chemistry [PDF]

Theoretica Chimica Acta, volume 94, July, 1996, page 53, 1996
The ring-shaped Hartmann potential $ V = \eta \sigma^{2} \epsilon_{0} \left( \frac{2 a_{0}}{r} - \frac{\eta a_{0}^{2}}{r^{2} sin^{2} \theta} \right) $ was introduced in quantum chemistry to describe ring-shaped molecules like benzene. In this article, the supersymmetric features of the Hartmann potential are discussed.
Blado, Gardo Garnet
arxiv   +4 more sources

An unexpected ring formation in morphine chemistry

ARKIVOC, 2001
Reaction of (7R)-N-benzyl-N-nor-7-bromoneopinone dimethyl acetal (2) with primary or secondary amines (RNH2, R1R2NH) resulted in 9-amino-substituted hasubanan derivatives; in particular, modification of the 9-(2-hydroxyethyl)amino derivative in subsequent steps gave products 8 with a 9-(oxazolidin-2'-one-3'-yl) substituent.
Wilhelm Fleischhacker, Bernd Richter, Gerald Giester, Thomas H. Brehmer   +3 more
doaj   +3 more sources

Sol-Gel Chemistry by Ring-Opening Polymerization [PDF]

MRS Proceedings, 1999
ABSTRACTSol-gel processing of materials is plagued by shrinkage during polymerization of the alkoxide monomers and processing (aging and drying) of the resulting gels. We have developed a new class of hybrid organic-inorganic materials based on the solventless ring-opening polymerization (ROP) of monomers bearing the 2,2,5,5-tetramethyl-2,5 ...
Kamyar Rahimian, Douglas A. Loy
openalex   +2 more sources

Chemistry of Small Ring Compounds. Part. I

Journal of Synthetic Organic Chemistry, Japan, 1964
Shinya Nishida, Takashi Tsuji
openalex   +4 more sources

Christmas Symposium Basel, December 4, 2020

CHIMIA, 2021

Daniel Joss, Ksenia Reznikova, Björn Pfund, Nadja Niggli, Gosia M. Murawska, Dzmitry A. Miarzlou, Claire E. Meyer, Vittoria Chimisso, Alain Baiyoumy, Pascal Rieder   +9 more
doaj   +1 more source

Silabenzene Incorporated Covalent Organic Frameworks [PDF]

Nature Chemistry 15 (2023) 136, 2021
Covalent organic frameworks (COFs) are a promising material for various applications such as gas storage/separation, catalysis, and energy storage, besides offering a confined space for chemical reaction. The introduction of unconventional elements into their frame structures and expanding their structural scope remains a major challenge in COF ...
arxiv   +1 more source

Operando CO Infrared Spectroscopy and On-Line Mass Spectrometry for Studying the Active Phase of IrO₂ in the Catalytic CO Oxidation Reaction

Inorganics, 2023
We combine operando diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) with on-line mass spectrometry (MS) to study the correlation between the oxidation state of titania-supported IrO2 catalysts (IrO2@TiO2) and their catalytic activity
Phillip Timmer, Tim Weber, Lorena Glatthaar, Herbert Over   +3 more
doaj   +1 more source