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The reaction of the oxocumulene ylide ketenylidenetriphenylphosphorane, Ph 3 PC C O (1), with an excess of water in THF yields a white microcrystalline solid, methyltriphenylphosphonium hydrogencarbonate, which contains one molecule of crystallization water, [Ph 3 MeP]CO 3 H.H 2 O (2). Compound 2 was characterized by IR, multinuclear NMR and ESI mass spectra. The...
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