Tellurium in Organic Synthesis by Nicola Petragnani

By Nicola Petragnani

The expanding variety of courses that use tellurium sincerely demonstrates the $64000 position of tellurium compounds as precise and robust instruments in a large diversity of natural chemical manipulations, usually characterised by means of their selective behavior.Tellurium in natural Synthesis offers an summary of the vital features of natural tellurium chemistry. Many chapters were enriched and up-to-date during this moment version. New chapters contain overviews of toxicology and pharmacology and a evaluate at the guidance and reactivity of a number of tellurium heterocycles.

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Chem. 1972, 38, 97. qxd 24 12/11/2006 3:58 PM Page 24 3. PREPARATION OF THE PRINCIPAL CLASSES OF ORGANIC TELLURIUM 23. Sadekov, I. ; Bushkov, A. ; Minkin, V. I. J. Gen. Chem. USSR 1977, 47, 576. 24. ; Lakshmikantham, M. ; Jen, K. ; Cava, M. C. J. Org. Chem. 1984, 49, 4819. 25. ; Sonoda, N. Angew. Chem. Int. Ed. Engl. 1987, 26, 1187. 26. ; Petragnani, N. Tetrahedron 1962, 18, 527. And later by Dabdoub, M. ; Comasseto, J. ; Braga, A. L. Synth. Commun. 1988, 18, 1979. 2. 27. ; Stern, D. Organometallics 1993, 12, 1445.

1 mol) is added dropwise (vigorous evolution of N2). When further addition of hydrazine no longer causes evolution of N2, the mixture is poured into H2O (700 mL), and extracted with ether (2ϫ300 mL). The extracts are washed with H2O, dried and evaporated, giving the telluride. p. 57°C). 5 Additional methods Sodium ascorbate6 and samarium diiodide7 have also been used as reducing agents. 0 mmol) in water/methanol (2ϩ8 mL). After 24 h, water (50 mL) and CH2Cl2 (50 mL) were added and the two phases separated.

Chem. Soc. 1983, 105, 2748. 22. Rheinboldt, H. in Houben-Weyl-Methoden der Organischen Chemie (ed. E. Muller). 4th edn, Vol. IX, p. 1102. Georg Thieme, Stuttgart, 1955. 23. Comasseto, J. ; Ferreira, J. T. ; Fontanellas, J. A. J. Organomet. Chem. 1984, 277, 261. 24. Comasseto, J. ; Lang, E. ; Ferreira, J. T. ; Correia, V. R. J. Organomet. Chem. 1987, 334, 329. 25. Fukuzawa, S. ; Sakai, S. Heteroatom. Chem. 1990, 1, 491. 26. ; Lin, R. Synth. Commun. 1993, 23, 189. 27. ; Zhang, Y. Synth. Commun. 1995, 25, 1913.

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