Results 1 to 10 of about 2,786,417 (386)
Chemischer Informationsdienst, 1977 AbstractSynthese und Reaktionen von 1‐Azirinen werden untersucht.
Vasu Nair, Ki Hyup Kim
semanticscholar +4 more sources
Imaging the Photochemical Ring-Opening of 1,3-Cyclohexadiene by Ultrafast Electron Diffraction [PDF]
Nature Chemistry, 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. +22 more
arxiv +6 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 +3 more
doaj +4 more sources
Classical Trajectories for two Ring-Shaped Potentials [PDF]
Int.J.Quant.Chem. 43 (1992) 625-645, 1998 This paper deals with the classical trajectories for two super-integrable systems: a system known in quantum chemistry as the Hartmann system and a system of potential use in quantum chemistry and nuclear physics. Both systems correspond to ring-shaped potentials.
Kibler, M. +2 more
arxiv +4 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
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
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