Organic derivatives of monocoordinated tellurium

Abstract

Data on the methods of synthesis, structures, and reactivity of organic derivatives of monocoordinated tellurium, namely, compounds with C=Te bonds and phosphine tellurides R 3 P=Te, are described systematically and generalised. The use of the latter compounds as synthetic equivalents of elemental tellu rium for the preparation of metal tellurides is considered. The bibliography includes 139 references.

Synthesis, reactions and structures of complexes of metal carbonyls and cyclopentadienyl carbonyls with organotellurium ligands

“…Methods for the synthesis and some reactions of complexes of phosphine tellurides with metal carbonyls and cyclopentadienyl carbonyls have been considered fairly comprehensively in a review. 19 Therefore, here we present only recent data concerning the structure, synthesis and transformations of some of these compounds (Table 1). Spectral characteristics of complexes 1a ± c are listed in Table 2 a As opposed to thiophosphorane complexes of a similar structure, phosphine telluride in the complexes 1a ± c cannot be replaced by Ph3P or CO even at 80 8C.…”

“…Synthesis and reactions of complexes of metal carbonyls with tellurocarbonyl compounds have been described in detail in a review. 19 Here we present only some examples of these complexes for which X-ray diffraction data have been obtained or chemical reactions have been studied (Tables 3, 4).…”

1,3-Bis(3-phenylpropyl)-1H-benzimidazole-2(3H)-tellurone

“…For related literature, see: Akkurt et al (2004aAkkurt et al ( ,b, 2005; Aydın et al (1999); Chakravorty et al (1985); Karaca et al (2005); Lappert (1988); Lappert et al (1980); Roeterdink et al (1983); Tü rktekin et al (2004); İngeç et al (1999); Nä rhi et al (2004); Sadekov et al (1998); Singh et al (2006).…”

“…The molecule has a twofold screw axis through the midpoints of the C2-C2a and C4-C4a bonds and containing the atoms Te1 and C1 of the benzimidazole ring. The Te-C single bond length generally varies between 2.120 and 2.170 Å depending on the electron releasing effect of the ligand bonding to Te atom (Lappert et al, 1980;Sadekov et al, 1998;Närhi et al, 2004;Singh et al, 2006). In the title compound (I), the Te-C bond length [2.058 (4) Å] is short, which agrees with the results reported by Lappert et al (1980).…”

Organophosphorus–Tellurium Chemistry: From Fundamentals to Applications

“…72 The versatility of phosphine tellurides as Te-transfer reagents is further manifested in their multifarious applications, e.g. (a) the synthesis of a bridging uranium telluride (eq 7), 116 (b) the preparation of terminal transition-metal tellurides (eq 8), 117 (c) insertion into metal-metal bonds (eq 9), 118 (d) the formation of an η 2 -Te 2 2-complex (eq 10), 119 and (e) chalcogen-exchange reactions to produce tellurometallates from selenometallates.…”