Tellurium, carbene complexes

The complete series, thio-, seleno-, and telluroformaldehyde complexes of osmium [OsCl(NO)(r72-E=CH2)(PPh3)2] (E = S, Se, Te), was obtained by reaction of the carbene complex [OsCl(NO)(=CH2)(PPh3)2] with elemental sulfur, selenium, and tellurium, respectively.53... 

Diethyl(ethylene)tellurourea formed complexes with chromium, molybdenum, tungsten, and manganese carbonyls, in which the tellurium is coordinated to the transition metal The solid complexes are moderately stable in air. They do not decompose when stored in the dark at 20° under an inert atmosphere. A toluene solution of the chromium complex at 20° deposited tellurium forming the chromium-carbene complex. ... 

Backed by the same advantages of ILs as a reaction medium, i.e. strong surface binding and the high-temperature operating window, microwave-assisted synthesis of single-crystalline tellurium nanorods and nanowires has been reported recently [38]. Monodisperse chromium nanoparticles could be made by thermolysis of a Fischer carbene complex [39]. 

Current IUPAC and Chemical Abstracts nomenclature has been employed in this index with the former given preference. Substitutive nomenclature has been given preference over radicofunc-tional, additive, subtractive, conjunctive or replacement nomenclature, except where this becomes unwieldy. With many bicyclic and polycyclic compounds bearing heteroatoms, standard bicyclic or polycyclic oxa, aza, and thia replacement nomenclature has often been used. With certain functional groups, where the names are rather complex and probably not familiar to most organic chemists, such as ylides, those compounds have simply been named as sulfur, tellurium and arsonic ylides. Metal carbenes have been treated similarly. With more complex functionality and many heterocycles, the Beilstein Commander Crossfire nomenclature system has been used with certain modifications. 

The reaction of ImMe27 Pr2 with tellurium tetraiodide yielded the carbene adduct of tellurium diiodide, implying reductive elimination of the halogen (Scheme 15.22) as had been observed for the selenium complexes of Dutton et al. When... 

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