ChemInform Abstract: TeAr6: Synthesis and Structure of the First Neutral Compounds Comprising Hexaarylated Elements.

Minoura, Mao; Sagami, Takao; Akiba, Kazuto; Modrakowski, Claudia; Sudau, Allexander; Seppelt, Konrad; Wallenhauer, Stephan

doi:10.1002/chin.199709152

Cited by 2 publications

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“…The reactions of aryl-lithium reagents with TeCl4 have also been used to generate hypervalent tellurium compounds Thus, the one-pot reaction of TeCl4 with LiAr (Ar = 4-CF3C6H4) in a 1:4 molar ratio in diethyl ether at room temperature produces the hexaaryl compound TeAr6 in 17 % yield, accompanied by Te(IV) and Te(II) derivatives (eq. 18) [76,77]. Changing the molar ratio to 1:6 did not improve the yield of TeAr6, however the reaction of 5 equivalents of PhLi with TeX4 (X = Cl, Br)…”

Section: Tellurium Tetrahalidesmentioning

confidence: 98%

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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Section: Tellurium Tetrahalidesmentioning

confidence: 98%

Selenium– and tellurium–halogen reagents

Chivers

Laitinen

2018

Physical Sciences Reviews

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“…Tetraalkyl-tellurium(IV) derivatives R4Te (R = Me, n Bu, Me3SiCH2, CH2=CH) are available from the reactions of the appropriate lithium or Grignard reagent in ether solvents at low temperature, however they exhibit a strong tendency to decompose to the corresponding dialkyl-tellurium(II)species[74,75].The reactions of aryl-lithium reagents with TeCl4 have also been used to generate hypervalent tellurium compounds Thus, the one-pot reaction of TeCl4 with LiAr (Ar = 4-CF3C6H4) in a 1:4 molar ratio in diethyl ether at room temperature produces the hexaaryl compound TeAr6 in 17 % yield, accompanied by Te(IV) and Te(II) derivatives (eq. 18)[76,77]. Changing the molar ratio to 1:6 did not improve the yield of TeAr6, however the reaction of 5 equivalents of PhLi with TeX4 (X = Cl, Br)…”

mentioning

confidence: 98%

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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ChemInform Abstract: TeAr6: Synthesis and Structure of the First Neutral Compounds Comprising Hexaarylated Elements.

Cited by 2 publications

References 1 publication

Selenium– and tellurium–halogen reagents

Selenium– and tellurium–halogen reagents

2. Selenium– and tellurium–halogen reagents

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