24727-22-8

Basic information

• Product Name: dibromo-bis-(4-methoxy-phenyl)-λ⁴-tellane
• Synonyms: dibromo-bis-(4-methoxy-phenyl)-λ⁴-tellane
• CAS NO: 24727-22-8
• Molecular Weight: 501.672
• Mol File: 24727-22-8.mol

Chemical Properties

• CAS DataBase Reference: dibromo-bis-(4-methoxy-phenyl)-λ⁴-tellane(CAS DataBase Reference)
• NIST Chemistry Reference: dibromo-bis-(4-methoxy-phenyl)-λ⁴-tellane(24727-22-8)
• EPA Substance Registry System: dibromo-bis-(4-methoxy-phenyl)-λ⁴-tellane(24727-22-8)

Safety Data

• Hazardous Substances Data: 24727-22-8(Hazardous Substances Data)

Upstream product

• 4456-36-4 di(p-methoxyphenyl)tellurium dichloride 
• 7558-02-3 potassium bromide 
• 100-66-3 methoxybenzene 
• 13139-86-1 4-methoxyphenyl magnesium bromide 
• 67-66-3 chloroform 
• 4456-34-2 bis(4-methoxyphenyl)telluride 
• 7726-95-6 bromine 
• 76065-47-9 C₁₇H₁₉BrO₂Te 

Relevant articles and documents

Studies on the pyrazine complexes of some diaryltellurium dihalides

Nine new Pyrazine Complexes of diaryltelluriumdihalides, R 2TeX2.Pyz (R =p-methoxyphenyl, p-hydroxyphenyl and 3-methyl- 4-hydroxy phenyl; X=Cl, Br, I; Pyz = pyrazine) have been prepared by reactions of diaryltelluriumdihalides with pyrazine in 1:1 molar ratio. These complexes have been characterized by elemental analysis, conductance and cryoscopic measurements, infrared and proton magnetic resonance spectral studies. Conductance studies in nitrobenzene, acetone and acetonitrile predict their non-electrolyte type behaviour in these solvents, which is well supported by cryoscopic data in nitrobenzene. IR and 1H NMR studies suggest the unidentate nature of pyrazine in these complexes, involving only one nitrogen atom in coordination. Thus, tellurium in R2TeX2.Pyz complexes attains a coordination number of five probably in a square pyramidal.

Debrominations of vic-Dibromides with Diorganotellurides. 1. Stereoselectivity, Relative Rates, and Mechanistic Implications

Debrominations of vic-dibromides with diaryl tellurides 1-4 and di-n-hexyl telluride (9) are described. A mechanistic explanation of the debromination is offered which accounts for several key experimental observations: (1) the reaction is highly stereoselective with erythro-dibromides giving trans-olefins and threo-dibromides giving cis-olefins, (2) the reaction is accelerated by more electron-rich diorganotellurides, (3) the reaction is accelerated in a more polar solvent, (4) the reaction is accelerated by the addition of carbocation-stabilizing substituents to the carbons bearing the bromo substituents, and (5) erythro-dibromides are much more reactive than threo-dibromides. It is proposed that bromonium ion formation from the vic-dibromide is slow and rate-determining. Bromonium ion formation is followed by rapid scavenging of "Br-" by the diorganotelluride. The bromonium ion formation provides stereoselectivity and eclipsing interactions lower the reactivity of threo-dibromides. No intermediate species were observed by 1H NMR.

Reactions of Diaryltellurides with Some Organic Halides and Sn(IV) Tetraiodide: Electrophilic Cleavage of Te-Allyl Bond

Diaryltellurides, RTeR' (R = R' = C6H5 or p-CH3OC6H4; and R = C6H5, R' = p-CH3OC6H4) react with allyl bromide, cyclohexyl iodide, CH3I, C6H5X (X = Br, I) or SnI4 to give corresponding triorganotelluronium halides.The Te-allyl bond is readily cleved by electrophiles as Br2, I2, ICl, BrCN, ICN.