Triphenylphosphine oxide

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What Wikipedia says

Triphenylphosphine oxide (often abbreviated TPPO) is the organophosphorus compound with the formula O=P(C6H5)3, also written as Ph3PO or PPh3O (Ph = C6H5). It is one of the more common phosphine oxides.

Excerpt from the Wikipedia article “Triphenylphosphine oxide”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: LHcheM, CC BY-SA 3.0, via Wikimedia Commons.