Results 31 to 40 of about 1,947 (193)
Acta Crystallographica Section E: Crystallographic Communications, 2018 In the title dispiro compound, C32H26ClN3O2, the cyclohexanone ring of the isoquinoline unit has a distorted envelope conformation, with the methylene C atom adjacent to the spiro C atom as the flap.
R. Vishnupriya +5 more
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Synthesis and Biological Evaluation of S-, O- and Se-Containing Dispirooxindoles
Molecules, 2021 A series of novel S-, O- and Se-containing dispirooxindole derivatives has been synthesized using 1,3-dipolar cycloaddition reaction of azomethine ylide generated from isatines and sarcosine at the double C=C bond of 5-indolidene-2-chalcogen-imidazolones
Maksim Kukushkin +10 more
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Syntheses of dispiro[2.1.4.1]decane and dispiro[2.0.3.3]decane
Tetrahedron Letters, 2000 Abstract Efficient syntheses of the hitherto unknown hydrocarbons dispiro[2.1.4.1]decane and dispiro[2.0.3.3]decane have been realized through reaction sequences involving spiro[3.4]octan-2-one and spiro[3.4]octan-5-one as key intermediates.
John E Baldwin +2 more
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ChemPhotoChem, Volume 6, Issue 1, January 2022., 2022 Feel the heat: We report the synthesis of a set of acridine‐containing 1,2‐dioxetanes characterized by both electron‐withdrawing and electron‐donating groups on the fluorophore unit. Thermochemiluminescence measurements clearly evidenced the ability of these compounds to be detected in biological samples making them particularly attractive as ...
Giada Moroni +6 more
wiley +1 more source
Acta Crystallographica Section E, 2014 In the title compounds, C22H20N2O4S, (I), and C22H19ClN2O4S, (II), the pyrrolidine rings have twist conformations on the spiro–spiro C—C bonds. In (I), the five-membered ring of the oxindole moiety has an envelope conformation with the spiro C atom as ...
M. P. Savithri +5 more
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Synthesis and X-ray crystal structure of a bridging trispiran ligand [PDF]
, 2004 The document attached has been archived with permission from the publisher.Spiro[3,3]heptane-2,6-dispiro-4,5-diazafluorene (4) has been synthesized in three steps from 1,10-phenanthroline.
Steel, P., Sumby, C.
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Acta Crystallographica Section E: Crystallographic Communications, 2015 The title compound, C23H22N2O4S, crystallized with two independent molecules (A and B) in the asymmetric unit. They have very similar conformations with the pyrrolidine ring having a twisted conformation, on the Cspiro—Cspiro bond, in both molecules.
R. Raja +4 more
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Luminescence modulation in liquid crystalline phases containing a dispiro[fluorene-9,11′-indeno[1,2-b]fluorene-12′,9′′-fluorene] core [PDF]
, 2014 International audienceA luminescent liquid crystalline compound containing a bulky dispiro[fluorene-9,11′-indeno[1,2-b]fluorene-12′,9′′-fluorene] has been designed and synthesized by di-substitution of a bromo derivative with N-(4-ethynylphenyl)-3,4,5 ...
Camerel, Franck +4 more
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Langgestreckte Moleküle von Dispiro[5.1.5.2]‐Typ
Chemische Berichte, 1992 Rod‐Like Dispiro[5.1.5.2] CompoundsA number of symmetrically and unsymmetrically substituted spiro compounds were synthesized starting from the dispiro[5.1.5.2]trione 1. The trans‐trans isomers of 2, 3, 6–10, and 11 were separated from the cis‐cis and cis‐trans isomers.
Vögtle, F., Hartmann, R., Boettcher, J.
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Activation of carbon suboxide (C3O2) by U(III) to form a cyclobutane-1,3-dione Ring. [PDF]
, 2018 The activation of C3O2 by the U(III) complex [U(η5-Cp’)3] (Cp’ = C5H4SiMe3) is described. The reaction results in the reductive coupling of three C3O2 units to form a tetranuclear complex with a central cyclobutane-1,3-dione ring, with concomitant loss ...
Cloke, Frederick Geoffrey +1 more
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