New Types of Stable Aldehydes: Formylphosphane and Formylphosphane Oxide

The reactivity of the formyl group in α-phosphorus-substituted aldehydes 1 can be tuned by adjusting the coordination number of the phosphorus atom. When X is a lone pair, the formylphosphanes obtained are stable compounds, whereas when X=O a relatively unstable formylphosphane oxide is produced. R=iPr₂N, cHex₂N.