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6277784 
Book/Book Chapter 
5 - Telluroheterocycles 
Petragnani, N; Stefani, HA 
2007 
Academic Press 
London 
Tellurium in Organic Synthesis (Second Edition) 
Publisher Summary This chapter focuses on telluroheterocycles. Tellurophene, the most important member of chalcogenophenes, is a light yellow, bad smelling and toxic oil rather stable in air. Tellurophene forms a charge-transfer complex with tetracyanoethylene and a complex with chromium tricarbonyl and sodium tetrachloro-palladate(II). Tetraphenyltellurophene forms a complex of indefinite structure with triiron dodecarbonyl. Telluroxanthene is prepared from bis(2-lithiophenyl)methane and elemental tellurium (Te) or by the cyclization of 2-(phenylmethyl)phenyl Te trichloride promoted by AlCl3. Telluroxanthene and telluroxanthone react with halogens in inert solvent to give the corresponding dihalides, which are reduced back to the parent compound with sodium sulphite or sodium disulphite. The chapter also discusses ditellurane derivatives, reductive dimerization of telluro and selenoxanthone, and tellurosteroids. 
Stefani, Hélio A.