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Phosphacumulene ylides of the general formula Ph3P=C=C=X [X=O, S, NR, (OR)2] are versatile C2-building blocks. They can act either as C-nucleophiles-only in a manner typical of phosphorus ylides, or as cumulenes undergoing [2 + n]-cycloadditions with other cumulenes such as CO2, COS, RNCO etc. Most prominent is their tandem addition–Wittig alkenation of hydroxy- or amino-substituted carbonyl compounds...
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