9-R-10-Telluroniaanthracene perchlorates

10-Telluroniaanthracene perchlorates with various substituents in the 9 position were obtained by the action of 70% HClO₄, on 9-R-10-tellura-9-anthracenols and of trityl perchlorate on 9-R-10-tellura-9-anthracenols and 9-R-9H-10-telluraanthracenes. The IR, UV, and PMR spectral characteristics of the products' were investigated.Deceased.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 343–346, March, 1981.     

Benzo-1,3-ditelluroles

Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1144–1145, August, 1988.     

Synthesis of phenoxatellurine derivatives

The reaction of dimedon enol acetate with tellurium tetrachloride gives derivatives of octahydrophenoxatellurine. The reaction of cyclohexanone enol acetate and methyl ethyl ketone with tellurium tetrachloride or aryltellurium trichloride gives the respective organotellurium trichloride and diorganotellurium dichloride.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 769–773, June, 1985.     

Benzo-1,3-ditellurolium tetrafluoroborate

Interaction of disodiumo-benzeneditellurolate with butyl dichloromethyl ether gave 2-butoxybenzo-l,3-ditellurole. Treatment of the latter with HBF₄ in acetic anhydride afforded benzo-1,3-ditellurolium tetrafluoroborate.Translated fromIzyestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 387–388, February, 1993.     

Molecular and crystal structure of 1-bromo-1-butyl-3H-2,1-benzoxatellurole

The molecular and crystal structure of 1-bromo-1-butyl-3H-2,1-benzoxatellurole was determined by x-ray diffraction structural analysis. Without taking account of secondary interactions, the molecule contains a tetracoordinated tellurium atom with bisphenoidal bond configuration. The angle between the axial bromine and oxygen atoms is 172.1°. The intermolecular Te...Br contacts (3.592 Å) connect the individual dimers into planar dieters, which expands the coordination about the tellurium atom to octahedral.Translated from Khimiya Geterotsiklicheskikh Soedinenii, Vol. 30, No. 3, pp. 417–419, March, 1994.     

Reactions of 2H-tellurochromene

2-H-Tellurochromene is characterized by reactions (halogenation, alkylation, and complex-formation) which result in an increase in the coordination number of the tellurium atom to 4 or 3, to give -telluranes, telluronium salts, and complexes with metal salts. Oxidation of 2-H-tellurochromene with trityl perchlorate affords tellurochromyllium perchlorate, and with dichromate 2-formylbenzo [b] tellurophene.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1050–1054, August, 1988.     

Intramolecular O→Te and N→Te coordination bonds in molecules of β-tellurocyclohexenals and their nitrogen analogs

The structures of -tellurocyclohexenals and their nitrogen analogs, viz., -methyltellurocyclohexenal (6), -(4-ethoxyphenyltelluro)cyclohexenal (7), di(2-formylcyclohexen-1-yl) telluride (8), -(4-ethoxyphenyltelluro)cyclohexenylidene(4"-methylaniline) (9), -bromotellurenylcyclohexenylidene(4"-methylaniline) (10), and -bromotellurenylcyclohexenal (4-methylbenzoyl)hydrazone (11), were studied by X-ray diffraction analysis. Compounds 6—11 have a Z configuration at the double bond, which provides the formation of intramolecular OTe or NTe coordination bonds. The bonds about the Te atom have a T-shaped configuration. There is only one of two possible OTe coordination bonds in dialdehyde 8 and, consequently, this compound belongs to the 10-Te-3-tellurane structural type. Hydrazone 11 possesses both NTe and OTe intramolecular coordination bonds. Taking into account these interactions, the coordination polyhedron of the tellurium atom can be considered as a trigonal bipyramid. The intramolecular OTe or NTe coordination bond lengths in compounds 6 (2.692 ), 7 (2.657 ), 8 (2.657 ), and 9 (2.690 ) are 0.9—1.0 smaller than the sums of the van der Waals radii of the corresponding atoms. These bond lengths in compounds 10 (2.170 ) and 11 (2.203 ) are almost equal to the standard covalent bond length.