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Relevant bibliographies by topics / 4-biradical

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Academic literature on the topic '4-biradical'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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Journal articles on the topic "4-biradical"

1

Hastings, David J., and Alan C. Weedon. "Stereochemical studies of the photochemical cycloaddition reaction of alkenes with N-benzoylindole and N-carboethoxyindole; evidence for biradical intermediacy." Canadian Journal of Chemistry 69, no. 7 (1991): 1171–81. http://dx.doi.org/10.1139/v91-175.

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The stereochemistries of the 2 + 2 cycloaddition products obtained from the photochemical addition reaction between N-benzoylindole or N-carboethoxyindole and the alkenes cyclopentene, cyclohexene, cycloheptene, cis- and trans-2-butene, and cis- and trans-4-octene are examined. The structures of the products are shown to be consistent with a photo-cycloaddition mechanism involving the intermediacy of triplet 1,4-biradical species. The quantum yields of adduct formation between N-benzoylindole and both cis- and trans-octene were measured as a function of alkene concentration. The results sugges

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2

Meyer, Lars, and Paul Margaretha. "Biradical to biradical rearrangement via 1,3-H atom transfer in photocycloisomerizations of 4-pent-4-enylcyclohex-2-enones." Photochemical & Photobiological Sciences 3, no. 7 (2004): 684. http://dx.doi.org/10.1039/b403724c.

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Zhou, Yan, Junfang Xie, Chaoyi Jin, Yue Ma, and Licun Li. "Magnetic Relaxation in a Heterolanthanide Binuclear Complex Involving a Nitronyl Nitroxide Biradical." Magnetochemistry 11, no. 4 (2025): 26. https://doi.org/10.3390/magnetochemistry11040026.

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The reaction of nitronyl nitroxide biradical NITPhMeImbis(5-(2-methylimidazole)-1,3-bis(1′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-hydro-1H-imidazol-2-yl)-benzene) with Dy(hfac)3 and La(hfac)3 (hfac = hexafluoroacetylacetonate) afforded a heterolanthanide complex [Dy0.56La1.44(hfac)7(NITPhMeImbisH)] (1). In this complex, the biradical NITPhMeImbis ligand chelates one Ln(III) ion via its two neighboring NO units and simultaneously binds the La(III) ion through another NO group to form a dinuclear structure. Direct current (dc) magnetic measurement shows the dominant ferromagnetic couplings in

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4

Xi, Lu, Jing Han, Xiaohui Huang, and Licun Li. "Nitronyl Nitroxide Biradical-Based Binuclear Lanthanide Complexes: Structure and Magnetic Properties." Magnetochemistry 6, no. 4 (2020): 48. http://dx.doi.org/10.3390/magnetochemistry6040048.

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Employing a new nitronyl nitroxide biradical NITPhPzbis(NITPhPzbis = 5-(1-pyrazolyl)-1,3-bis(1’-oxyl-3’-oxido-4’,4’,5’,5’-tetramethyl-4,5-hydro-1H-imidazol-2-yl)benzene), a series of 2p-4f complexes [Ln2(hfac)6(H2O)(NITPhPzbis)] (LnIII = Gd1, Tb2, Dy3; hfac = hexafluoroacetylacetonate) were successfully synthesized. In complexes 1–3, the designed biradical NITPhPzbis coordinates with two LnIII ions in chelating and bridging modes to form a four-spin binuclear structure. Direct-current magnetic study of Gd analogue indicates that ferromagnetic exchange exists between the Gd ion and the radical

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5

Ito, Saki, Toru Yoshitake, and Takayuki Ishida. "Ferromagnetic 2p-2p and 4f-2p Couplings in a Macrocycle from Two Biradicals and Two Gadolinium(III) Ions." Molecules 27, no. 15 (2022): 4930. http://dx.doi.org/10.3390/molecules27154930.

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A new ground triplet biradical 2′,4′,6′-triisopropylbiphenyl-3,5-diyl bis(tert-butyl nitroxide) (iPr3BPBN) was prepared and characterized by means of room-temperature ESR spectroscopy displaying a zero-field splitting pattern together with a half-field signal. Complex formation with gadolinium(III) 1,1,1,5,5,5-hexafluoropentane-2,4-dionate (hfac) afforded a macrocycle [{Gd(hfac)3(μ-iPr3BPBN)}2]. As the X-ray crystallographic analysis clarified, the biradical serves as a bridging ligand, giving a 16-membered ring, where each nitroxide radical oxygen atom is directly bonded to a Gd3+ ion. The ma

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6

Wang, Xiao-Tong, Xiao-Hui Huang, Hong-Wei Song, Yue Ma, Li-Cun Li, and Jean-Pascal Sutter. "Cyclic [Cu-biRadical]2 Secondary Building Unit in 2p-3d and 2p-3d-4f Complexes: Crystal Structure and Magnetic Properties." Molecules 28, no. 6 (2023): 2514. http://dx.doi.org/10.3390/molecules28062514.

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Employing the new nitronyl nitroxide biradical ligand biNIT-3Py-5-Ph (2-(5-phenyl-3-pyridyl)-bis(4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide)), a 16-spin Cu-radical complex, [Cu8(biNIT-3Py-5-Ph)4(hfac)16] 1, and three 2p-3d-4f chain complexes, {[Ln(hfac)3][Cu(hfac)2]2(biNIT-3Py-5-Ph)2}n (LnⅢ= Gd 2, Tb 3, Dy 4; hfac = hexafluoroacetylacetonate), have been prepared and characterized. X-ray crystallographic analysis revealed in all derivatives a common cyclic [Cu-biNIT]2 secondary building unit in which two bi-NIT-3Py-5-Ph biradical ligands and two CuII ions are associated via the pyridine N at

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7

Kostryukov, S. G., E. V. Kraynov, A. Sh Kozlov, and O. Yu Chernyaeva. "SYNTHESIS OF REDOX-ACTIVE POLYMER BASED VERDASIL BIRADICAL." Вестник Пермского университета. Серия «Химия» = Bulletin of Perm University. CHEMISTRY 9, no. 3 (2019): 266–78. http://dx.doi.org/10.17072/2223-1838-2019-3-266-278.

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A redox-active polymer based on a verdazyl biradical - 4,4'-bis(3-(4’-hydroxyphenyl)-5-phenylverdazyl-1)-1,1'-biphenyl and 2,4-toluene diisocyanate was obtained. Verdazyl radical, being a diatomic phenol, easily reacts with toluene diisocyanate to form polyurethane. The presence of ure-thane bonds in the polymer molecule was confirmed by IR, and the presence of radical centers by EPR spectroscopy. The cyclic voltammetry method showed the ability of a polymer to undergo reversible redox transitions.

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8

Surinder, Berar, Berar UrmiJa, Thakur Mandeep, C. Gupta Satish, and C. Kamboj Ramesh. "Photochemistry of 3-alkoxy chromones : Photocyclisation of 3-benzyloxy-6-chloro-2-(1' -methyl-2' -phenylvinyl)-4-oxo-4H-1-benzopyran." Journal of Indian Chemical Society Vol. 85, July 2008 (2008): 759–62. https://doi.org/10.5281/zenodo.5817225.

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Department of Chemistry, Kurukshetra University, Kurukshetra-136 119, Haryana, India E-mail : rckamboj@rediffmail.com            Fax: 91-1744-238277 Manuscript received 31 December 2007. accepted 6 May 2008 Photocyclisation of 3-benzyloxy-6-chloro-2-(11 -methyl-21 -phenylvinyl)-4-oxo-4<em>H</em>-1-benzopyran with pyrex filtered <strong>UV</strong> light to yield linear tricyclic pyranopyrone and angular fused tetracyclic compound is described. The product formation occurred via cyclisation of 1,4-biradical produced through H-abstraction by <strong>C=O</strong> gro

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9

Cindro, Nikola, Margareta Horvat, Kata Mlinarić-Majerski, Axel G. Griesbeck, and Nikola Basarić. "Photoinduced homolytic C–H activation in N-(4-homoadamantyl)phthalimide." Beilstein Journal of Organic Chemistry 7 (March 2, 2011): 270–77. http://dx.doi.org/10.3762/bjoc.7.36.

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N-(4-homoadamantyl)phthalimide (5) on excitation and population of the triplet excited state underwent intramolecular H-abstractions and gave products 6 and 7. The major product, exo-alcohol 6 was a result of the regioselective δ H-abstraction and the stereoselective cyclization of the 1,5-biradical. Minor products 7 were formed by photoinduced γ H-abstractions, followed by ring closure to azetidinols and ring enlargement to azepinediones. The observed selectivity to exo-alcohol 6 was explained by the conformation of 5 and the best orientation and the availability of the δ-H for the abstractio

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10

Sugiyama, Hiroshi, Tsuyoshi Fujiwara, and Isao Saito. "Activation of neocarzinostatin-chromophore by 4-hydroxythiophenol: Intramolecular radical trapping of biradical intermediate." Tetrahedron Letters 35, no. 47 (1994): 8825–28. http://dx.doi.org/10.1016/s0040-4039(00)78508-x.

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Book chapters on the topic "4-biradical"

1

Pardasani, R. T., and P. Pardasani. "Magnetic properties of β-4,4’-(butadiyne-1,4-diyl)bis(2,2,6,6-tetramethyl-4-hydroxypiperidin-1-oxyl) biradical." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-23675-4_4718.

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2

Torii, Sigeru, Tomoyuki Hase, Manabu Kuroboshi, et al. "Synthesis of Terminal-Biradical Compounds Consisting of Two N-Oxyl Groups Connected with Conjugated π-Systems." In Novel Trends in Electroorganic Synthesis. Springer Japan, 1998. http://dx.doi.org/10.1007/978-4-431-65924-2_26.

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3

Wang, Q., J. ‐S Wang, Y. Li, and G. ‐S Wu. "ESR studies on a new phenyl t‐butyl nitroxide biradical based on calix[4]arene." In EPR in the 21st Century. Elsevier, 2002. http://dx.doi.org/10.1016/b978-044450973-4/50060-3.

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4

"Pericyclic Reactions." In Reactivity and Mechanism in Organic Chemistry. The Royal Society of Chemistry, 2022. http://dx.doi.org/10.1039/9781837670970-00101.

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Chapter 3 is dedicated to pericyclic reactions and selected rearrangement reactions, and to reactions involving transient intermediates, such as radicals, diradicals or carbocations. The class of electrocyclic ring-opening reactions is first used to illustrate the application of FMO theory arguments and the classification of reactions as orbital symmetry allowed or forbidden. After a short section on biradical intermediates in cyclization reactions of enediynes and eneyne-allenes, we next analyze cycloaddition reactions with the goal of classifying reactions as concerted or stepwise, as synchr

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