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Phosphaketene ylides (general formula R₃P=C=C=O) and carbon suboxide (O=C=C=C=O) have also exhibited carbone-like character where a carbon (0) species participates in a donor-acceptor interaction with carbon monoxide.  The crystal structure of triphenylphosphoranylideneketen (Ph₃PC₂O) revealed a P-C-C bond angle of 145.5° consistent with the bent structure of other carbon (0) compounds. While both computational and experimental data indicated a linear structure for carbon

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