Mechanistic aspects of the isomerization of Z-vinylic tellurides double bonds in the synthesis of potassium Z-vinyltrifluoroborate salts

• Hélio A. Stefani,
• Rafael C. Guadagnin,
• Artur F. Keppler,
• Giancarlo V. Botteselle,
• João V. Comasseto and
• Carlos A. Suganuma

Beilstein J. Org. Chem. 2008, 4, No. 9, doi:10.1186/1860-5397-4-9

• -aryl [4], alkenyl-alkynyl [5], and alkenyl-aryl [6] cross-coupling reactions. Distinct from the most commonly explored hydrometallation reactions, the hydrotelluration of alkynes exclusively forms Z-vinylic tellurides [7]. Vinylic tellurides have the ability to undergo tellurium-metal exchange

• experiments using 3,5-dibromo-4-nitrosobenzenesulfonate (DBNBS), which is an appropriate spin trap for tellurium centered radicals [17]. Radical species were detected at the i and ii steps of the proposed route. In the first step (i, Scheme 1), the detected spectra contained a mixture of DBNBS radical adducts

Synthesis of phosphorothioates using thiophosphate salts

• Babak Kaboudin and
• Fatemeh Farjadian

Beilstein J. Org. Chem. 2006, 2, No. 4, doi:10.1186/1860-5397-2-4

• phosphorchloridate with thiols [22][23][24][25][26] and (iii) redox-type reactions of phosphorus triesters with thiols in the presence of tellurium (IV) chloride. [27][28] However, all of these methods have problems, including drastic reaction conditions and also some severe side reactions. Surface-mediated solid