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The bis(triphenylphosphoniumylidyl)halophosphines expected from the condensation of ylidyl dihalophosphines with trimethylsilyl ylides or of their addition to carbodiphosphoranes enter a spontaneous dissociation to yield bis(ylidyl)phosphenium halides. They are the first phosphenium salts which do not need anions of low basicity such as AlCl 4− . 31 P NMR spectra and, in one case,...
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