efficient one-pot synthesis of a variety of functionalized diaryltellurium dicarboxylates. The method is based on a mild photosensitized oxygenation of cheap and readily available carboxylic acids. The molecular structures of the diaryltellurium dicarboxylates were determined unambiguously using single-crystal X-ray diffraction analysis. The thus obtained diaryltellurium dicarboxylates were used to study
本文介绍了一种简洁高效的一锅法合成多种官能化二芳基碲二羧酸盐的方法。该方法基于廉价且容易获得的羧酸的温和光敏氧化。使用单晶 X 射线衍射分析明确地确定了二芳基碲二羧酸盐的分子结构。如此获得的二芳基碲二羧酸盐用于研究安息香衍生物的氧化。
Secondary bonding. Part 13. Aryl-tellurium(<scp>IV</scp>) and -iodine(<scp>III</scp>) acetates and trifluoroacetates. The crystal and molecular structures of bis-(p-methoxyphenyl)tellurium diacetate, µ-oxo-bis[diphenyltrifluoroacetoxytellurium] hydrate, and [bis(trifluoroacetoxy)iodo]benzene
作者:Nathaniel W. Alcock、W. David Harrison、Colin Howes
DOI:10.1039/dt9840001709
日期:——
The crystal and molecularstructures of the title compounds have been determined from diffractometer data by the heavy-atom method, and their preparations are described. Crystals of (p-MeOC6H4)2Te(O2CMe)2(1) are monoclinic, space group P21/c, with unit-cell dimensions a= 9.529(2), b= 11.984(2), c= 17.035(2)Å, β= 101.70(2)°, Z = 4, and for 3 033 observed reflections [I/σ(I) > 3.0], R= 0.022. Crystals
Diaryltellurium diacetates have been prepared in excellent yields by the oxidation of diaryltellurides with leadtetraacetate and also by the reaction of diaryltellurium dichlorides with silver acetate. Hydrolysis, reduction and exchange reactions of these derivatives and their spectral data are described.
PHOTOLYTIC α-ELIMINATION OF ORGANIC HALIDES FROM ORGANOTELLURIUM(IV) HALIDES
作者:Sakae Uemura、Shin-ichi Fukuzawa
DOI:10.1246/cl.1980.943
日期:1980.8.5
Irradiation of organotellurium(IV) halides in benzene affords the corresponding organichalide by α-elimination, the carbon–halogen bond being formed at ipso-position and in some case retentively. The reaction is not affected by the presence or absence of oxygen and t-butoxy radical.
This paper reports an efficient method for the epoxidation of a variety of functionalized olefins using diaryltellurium dicarboxylates as hypervalent tellurium compounds. This method is able to efficiently convert olefins into epoxides using catalytic amounts of tellurium and urea hydrogen peroxide. Furthermore, we propose that this reaction proceeds via the formation of peroxides of phenol, carboxylic