262-30-6Relevant articles and documents
STUDIES ON LONG-RANGE COUPLINGS BETWEEN 77Se AND 13C IN SOME ARYL SELENIDES, DICHLORIDES, AND SELENOXIDES. THE INVERSE EFFECT ON COUPLINGS IN THE SELENOXIDE FORMATION.
Nakanishi,Ikeda
, p. 1661 - 1664 (1983)
Long-range coupling constants between **7**7Se and **1**3C in selenoanisole, diphenyl selenide, diphenyl diselenide, and their 2-mono- and 2,2 prime -disubstituted derivatives, selenoxanthone, selenanthrene, dichlorides, and selenoxides were measured to disclose predominant factors governing the magnitude of the coupling. Extraordinary large values for two- and three-bond couplings are found in selenoxanthone. Three factors are operative: the orientational effect, the coordination number, and the effect of ring formation. The last factor accompanies a stronger inverse effect on the coupling of selenoxides than on that of selenides.
Selenium/tellurium-containing heterocyclic compound, preparation method and conversion method thereof
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Paragraph 0080-0086, (2021/07/28)
The invention discloses a selenium/tellurium-containing heterocyclic compound, a preparation method and a conversion method thereof, wherein the selenium/tellurium-containing heterocyclic compound comprises a 1, 4-diselenide/tellurene compound and a selenium/tellurophene compound. The invention discloses a method for selectively generating 1, 4-diselenide/tellurene and selenium/tellurophene compounds from elemental selenium/tellurium and activated internal alkyne under the regulation and control of temperature. The invention discloses a method for converting 1, 4-diselenide/tellurene into selenium/tellurophene under high temperature or oxidation conditions. According to the invention, the synthesis method is free of metal catalysis, mild in reaction condition, safe and simple to operate, green, economical and good in selectivity, and the selenium/tellurium-containing compound has excellent photoelectric properties and biological activity and has good application prospects in the aspects of application of photoelectric materials, synthesis of natural products and drugs, construction of protein molecules and the like.
Transition-metal-free synthesis of unsymmetrical diaryl chalcogenides from arenes and diaryl dichalcogenides
Prasad, Ch Durga,Balkrishna, Shah Jaimin,Kumar, Amit,Bhakuni, Bhagat Singh,Shrimali, Kaustubh,Biswas, Soumava,Kumar, Sangit
, p. 1434 - 1443 (2013/03/29)
A transition-metal-free synthetic method has been developed for the synthesis of unsymmetrical diaryl chalcogenides (S, Se, and Te) from diaryl dichalcogenides and arenes under oxidative conditions by using potassium persulfate at room temperature. Variously substituted arenes such as anisole, thioanisole, diphenyl ether, phenol, naphthol, di- and trimethoxy benzenes, xylene, mesitylene, N,N-dimethylaniline, bromine-substituted arenes, naphthalene, and diaryl dichalcogenides underwent carbon-chalcogen bond-forming reaction to give unsymmetrical diaryl chalcogenides in trifluoroacetic acid. To understand the mechanistic part of the reaction, a detailed in situ characterization of the intermediates has been carried out by 77Se NMR spectroscopy by using diphenyl diselenide as the substrate. 77Se NMR study suggests that electrophilic species ArE+ is generated by the reaction of diaryl dichalcogenide with persulfate in trifluoroacetic acid. The electrophilic attack of arylchalcogenium ion on the arene may be responsible for the formation of the aryl-chalcogen bond.
Potassium selenocyanate as an efficient selenium source in C-Se cross-coupling catalyzed by copper iodide in water
Kumar, A. Vijay,Reddy, V. Prakash,Reddy, C. Suresh,Rao, K. Rama
supporting information; experimental part, p. 3978 - 3981 (2011/08/09)
An efficient and conceptually new protocol for C-Se cross coupling of potassium selenocyanate with aryl halides via copper-catalyzed cascade reaction has been developed in water. Utilizing this protocol, a variety of aryl and heteroaryl halides were reacted with potassium selenocyanate to afford the corresponding diaryl selenides in moderate to good yields.
TRANSMETALLATION REACTIONS INVOLVING PHENYLENEMERCURIALS
Humphries, R. E.,Al-Jabar, N. A. A.,Bowen, D.,Massey, A. G.,Deacon, G. B.
, p. 59 - 68 (2007/10/02)
When heated with Group V and Group VI elements, the phenylenemercurials (C6H4Hg)3, (C6F4Hg)3 and (C6Cl4Hg)3 form heterocycles of formulae M2(C6X4)3 and M'2(C6X4)2 where M = As, Sb, Bi and M' = S, Se, Te.The compounds Te2(C6Cl4)2 and M2(C6Cl4)3 (M = As, Sb, Bi) were also obtained by heating the elements with 1,2-I2C6Cl4, which was prepared by mercuration of 1,2-H2C6Cl4 followed by iododemercuration.Octachlorothianthrene has been obtained by heating sulphur with Te2(C6Cl4)2, C6Cl6 or C6H5I, and from the reaction between 1,2-H2C6Cl4, AlCl3, and S2Cl2.
"Selenium Polonovski Reaction" Using Benzeneselenyl Triflate
Okazaki, Renji,Itoh, Yukinori
, p. 1575 - 1578 (2007/10/02)
Selenoxyammonium salts prepared from tertiary amine N-oxides and benzeneselenyl triflate undergo rearrangement in the presence of triethylamine or DBU to give α-selenoxyamines, which react in situ with an electrophile or nucleophile to afford new secondary or tertiary amine derivatives.
NOVEL REDUCTION OF CHLORINE ADDUCTS OF ARYL AND ALKYL SELENIDES WITH DIMETHYL SULFOXIDE
Nakanishi, Waro,Sakaue, Akira,Ikeda, Yoshitsugu,Iwamura, Hiizu
, p. 33 - 34 (2007/10/02)
The adducts of chlorine with diaryl selenides such as selenanthrene, diphenyl selenide, and selenoxanthone have been found to be reduced to the corresponding selenides in dimethyl sulfoxide forming chloromethyl methyl sulfoxide and hydrogen chloride.Similarly, dimethyl selenide dichloride was reduced to dimethyl selenide in the presence of a base.
