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- W2068449904 abstract "Stable Tellurium Ylides: Synthesis and Reactivity of Diorganyltelluronium 4,5‐Dicyanoimidazol‐2‐ylides Diorganyl tellurides R 2 Te (RMe, Me 3 SiCH 2 , Ph) react with 2‐diazo‐4,5‐dicyano‐2 H ‐imidazole ( 1 ) at – 30°C to form the title compounds 2 – 4. The ylides 3 and 4 are thermally stable up to their melting points of 159 and 243°C, resp., whereas 2 undergoes a modified Stevens rearrangement at 190°C with formation of a 2‐(methyltelluro)imidazole ( 10 ). The reactivity of 2 – 4 is determined by an extreme charge separation between the onium centre and the ylide entity. No Wittig reactivity is observed, alkylation occurs at the imidazole nitrogen and carbanions lead to tetraorganyl tellurium compounds with limited stability." @default.
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- W2068449904 date "1991-04-01" @default.
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- W2068449904 title "Stabile Tellur‐Ylide: Darstellung und Reaktivität von Diorganyltelluronium‐4,5‐dicyanimidazol‐2‐yliden" @default.
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- W2068449904 doi "https://doi.org/10.1002/cber.19911240405" @default.
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