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- W2891486169 abstract "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, EX 2 (E = Se, Te; X = Cl, Br) and E 2 X 2 (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 REX 3 , R 2 EX 2 and REX (R = alkyl, aryl; E = Se, Te; X = F, Cl, Br, I); mixed-valent (IV/II) compounds of the type RTeX 2 TeR 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." @default.
- W2891486169 created "2018-09-27" @default.
- W2891486169 creator A5025700723 @default.
- W2891486169 creator A5028685824 @default.
- W2891486169 date "2018-09-14" @default.
- W2891486169 modified "2023-10-16" @default.
- W2891486169 title "Selenium– and tellurium–halogen reagents" @default.
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