Unsaturated Five‐Membered Selenium—Silicon Containing Heterocycles Based on the Reactions of Selenium Di‐ and Tetrahalides with Diorganyl Diethynyl Silanes.

Амосова, С. В.; Мартынов, А. В.; Mahaeva, Natalia A.; Belozerova, O. V.; Пензик, М. В.; Albanov, A. I.; Yarosh, O. G.; Воронков, М. Г.

doi:10.1002/chin.200725171

Cited by 3 publications

(3 citation statements)

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“…An early report revealed the formation of selenasilafulvenes from the reactions of SeX2 (X = Cl, Br) with diorganyl diethynylsilanes [32] and this methodology has been extended to germanium-containing systems [22]. These reactions proceed with chemo-, regio-and stereoselectivity in chloroform at room temperature [22,33]. The transannular addition of SeX2 to cis,cis-1,5-cyclooctadiene takes place chemo-and regio-selectively to give 2,6-dihalo-9-selenobicyclo[3.3.1]nonanes in high yields [23].…”

Section: Selenium Dihalidesmentioning

confidence: 99%

2. Selenium– and tellurium–halogen reagents

Chivers¹,

Laitinen²

2019

Selenium and Tellurium Reagents

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Selenium and tellurium form binary halides in which the chalcogen can be in formal oxidation states (IV), (II) or (I). They are versatile reagents for the preparation of a wide range of inorganic and organic selenium and tellurium compounds taking advantage of the reactivity of the chalcogenhalogen bond. With the exception of the tetrafluorides, the tetrahalides are either commercially available or readily prepared. On the other hand, the low-valent species, EX2 (E = Se, Te; X = Cl, Br) and E2X2 (E = Se, Te; X = Cl, Br) are unstable with respect to disproportionation and must be used as in situ reagents. Organoselenium and tellurium halides are well-known in oxidation states (IV) and (II), as exemplified by REX3, R2EX2, and REX (R = alkyl, aryl; E = Se, Te; X = F, Cl, Br, I), as well as mixed-valent (IV/II) compounds of the type RTeX2TeR are also known. This chapter surveys the availability and/or preparative methods for these widely used reagents followed by examples of their applications in synthetic inorganic and organic selenium and tellurium chemistry. For both the binary halides and their organic derivatives the discussion is subdivided according to the formal oxidation state of the chalcogen.

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Section: Selenium Dihalidesmentioning

confidence: 99%

2. Selenium– and tellurium–halogen reagents

Chivers¹,

Laitinen²

2019

Selenium and Tellurium Reagents

View full text Add to dashboard Cite

show abstract

Section: Selenium Dihalidesmentioning

confidence: 99%

Selenium– and tellurium–halogen reagents

Chivers

Laitinen

2018

Physical Sciences Reviews

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Abstract Selenium and tellurium form binary halides in which the chalcogen can be in formal oxidation states (IV), (II) or (I). They are versatile reagents for the preparation of a wide range of inorganic and organic selenium and tellurium compounds taking advantage of the reactivity of the chalcogen–halogen bond. With the exception of the tetrafluorides, the tetrahalides are either commercially available or readily prepared. On the other hand, the low-valent species, EX2 (E = Se, Te; X = Cl, Br) and E2X2 (E = Se, Te; X = Cl, Br) are unstable with respect to disproportionation and must be used as in situ reagents. Organoselenium and tellurium halides are well-known in oxidation states (IV) and (II), as exemplified by REX3, R2EX2 and REX (R = alkyl, aryl; E = Se, Te; X = F, Cl, Br, I); mixed-valent (IV/II) compounds of the type RTeX2TeR are also known. This chapter surveys the availability and/or preparative methods for these widely used reagents followed by examples of their applications in synthetic inorganic and organic selenium and tellurium chemistry. For both the binary halides and their organic derivatives, the discussion is subdivided according to the formal oxidation state of the chalcogen.

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“…We performed the reactions of SeCl 2 and SeBr 2 with dimethyldiethynylsilane which led to the formation of 3,6-dihalo-4,4-dimethyl-1,4-selenasilafulvenes [2,3]. This reaction extended further to dialkyldiethynylsilanes and -germanes showed the way to new classes of heterocycles containing in the ring atoms of selenium and the elements of 16 group [4][5][6][7][8].…”

Section: Sementioning

confidence: 99%