16 April 2013 (online)
The ability to endure tellurium–metal exchange with retention of the double bond configuration, allowing the formation of new carbon–carbon bonds in a very selective way, makes vinylic tellurides a promising class of compounds in organic synthesis.
For the preparation of Z-vinylic tellurides, the most convenient and widely used method is the hydrotelluration of alkynes. It differs from other hydrometallations in that it occurs through anti-addition of the tellurolate anion to the triple bond of the terminal alkyne, the regioselectivity being dependent on the nature of the alkyne source.
Due to the simple preparation and purification procedures of vinylic tellurides compared to other organometallic reagents, the application of this class of compounds to the synthesis of biologic active compounds, as well as the study of their toxicological and pharmacological aspects, has experienced an exponential growth in the last years.
In addition, vinylic tellurides are air-stable and can be easily handled or stored for long periods; unlike Grignard or organolithium reagents.
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