3878-44-2Relevant articles and documents
Fedin, V. P.,Mironov, Yu. V.,Sokolov, M. N.,Kolesov, B. A.,Fedorov, V. Ye.,et al.
, p. 275 - 282 (1990)
2,2,4,4-Tetrakis(trifluoromethyl)- and 2,4-Bis(hexafluoroisopropylidene)-1,3-diselenetane
Raasch, Maynard S.
, p. 3517 - 3518 (1980)
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Reaction of 1,2,3-selenadiazoles with phosphines
Arsenyan,Oberte,Rubina,Belyakov,Lukevics
, p. 503 - 506 (2004)
Nucleophilic attack of tributyl- and triphenylphosphines on 4-phenyl- and 5-ethoxycarbonyl-4-methyl-1,2,3-selenadiazoles leads to the quantitative formation of selenophosphoranes and substituted acetylenes. The molecular structure of 4-phenyl-1,2,3-selenadiazole was confirmed by X-ray crystallography.
Novel formation of 1,2,4-triselenolanes by the reaction of tert-butylarylmethylenetriphenylphosphoranes with elemental selenium
Okuma, Kentaro,Kubota, Tomoaki
, p. 3881 - 3883 (2001)
Reaction of tert-butylarylmethylenetriphenylphosphoranes with elemental selenium afforded the corresponding 1,2,4-triselenolanes (1), 1,3-diselenetanes (4), and triphenylphosphine selenide. Triselenolanes 1 were formed from selenation of 4, which may suggest a stepwise selenation of selenoketones.
Heteroleptic Samarium(III) Chalcogenide Complexes: Opportunities for Giant Exchange Coupling in Bridging σ- And π-Radical Lanthanide Dichalcogenides
Dimucci, Ida M.,Giansiracusa, Marcus J.,Goodwin, Conrad A. P.,Kragskow, Jon G. C.,Lancaster, Kyle M.,Mills, David P.,Réant, Benjamin L. L.,Sproules, Stephen,Vettese, Gianni F.
supporting information, (2020/06/08)
The introduction of (N2)3-? radicals into multinuclear lanthanide molecular magnets raised hysteresis temperatures by stimulating strong exchange coupling between spin centers. Radical ligands with larger donor atoms could promote more efficient magnetic coupling between lanthanides to provide superior magnetic properties. Here, we show that heavy chalcogens (S, Se, Te) are primed to fulfill these criteria. The moderately reducing Sm(II) complex, [Sm(N??)2], where N?? is the bulky bis(triisopropylsilyl)amide ligand, can be oxidized (i) by diphenyldichalcogenides E2Ph2 (E = S, Se, Te) to form the mononuclear series [Sm(N??)2(EPh)] (E = S, 1-S; Se, 1-Se, Te, 1-Te); (ii) S8 or Se8 to give dinuclear [{Sm(N??)2}2(μ-η2:η2-E2)] (E = S, 2-S2; Se, 2-Se2); or (iii) with Te=PEt3 to yield [{Sm(N??)2}(μ-Te)] (3). These complexes have been characterized by single crystal X-ray diffraction, multinuclear NMR, FTIR, and electronic spectroscopy; the steric bulk of N?? dictates the formation of mononuclear complexes with chalcogenate ligands and dinuclear species with the chalcogenides. The Lα1 fluorescence-detected X-ray absorption spectra at the Sm L3-edge yielded resolved pre-edge and white-line peaks for 1-S and 2-E2, which served to calibrate our computational protocol in the successful reproduction of the spectral features. This method was employed to elucidate the ground state electronic structures for proposed oxidized and reduced variants of 2-E2. Reactivity is ligand-based, forming species with bridging superchalcogenide (E2)-? and subchalcogenide (E2)3-? radical ligands. The extraordinarily large exchange couplings provided by these dichalcogenide radicals reveal their suitability as potential successors to the benchmark (N2)3-? complexes in molecular magnets.
Assessing the Activity of Lewis Bases Organocatalysts in Halonium-Induced Carbocyclization Reactions
Grandclaudon, Charlotte,Ruamps, Mirko,Duboc, Rapha?l,Michelet, Véronique,Toullec, Patrick Y.
supporting information, p. 1181 - 1186 (2018/04/16)
Lewis bases were evaluated as catalysts for halocarbocyclization reactions of alkynylstyrenes and a cinnamylaniline derivative. Phosphines and phosphorus chalcogenides exhibited high activity for the conversion of alkynylstyrenes in the presence of N -halosuccinimides with up to a 30-fold increase of the initial reaction rate with respect to the background reaction. Phosphorus sulfides and selenides showed the best catalytic activity for the iodocarbocyclization of a cinnamylaniline derivative in the presence of diiodohydantoin. An asymmetric variant of the iodocarbocyclization reaction of an alkynylstyrene using a chiral phosphorus selenide resulted in a modest enantioselectivity.
