Ylides and phosphanes are resonance forms of each other.

Name: Ylides and phosphanes are resonance forms of each other.
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Ylides (R2C=CR2+) and phosphanes (R3P) have similar electronic structure and can be considered as resonance forms of each other. The ylide form has a negatively charged carbon atom and a positively charged phosphorus atom, while the phosphane form has a neutral carbon atom and a negatively charged phosphorus atom.

Ylides and Phosphanes Are Resonance Forms of Each Other