Triphenylphosphine oxide
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Triphenylphosphine oxide is an organophosphorus compound with the formula (C_H_)_PO, often abbreviated as Ph_PO or TPPO. It is a white crystalline solid that is soluble in organic solvents but insoluble in water. This compound is a common byproduct in reactions involving triphenylphosphine.
Structure and properties
Triphenylphosphine oxide is characterized by a tetrahedral phosphorus center bonded to three phenyl groups and one oxygen atom. The P=O bond is highly polar, contributing to the compound's significant dipole moment. The presence of the oxygen atom makes the compound a good hydrogen bond acceptor, which influences its solubility and reactivity.
Synthesis
Triphenylphosphine oxide is typically produced as a byproduct in reactions where triphenylphosphine is used as a reagent. For example, it is formed in the Wittig reaction, where triphenylphosphine reacts with an alkyl halide to form a phosphonium salt, which then reacts with a carbonyl compound to yield an alkene and triphenylphosphine oxide.
Applications
Although often considered a waste product, triphenylphosphine oxide has some applications. It is used as a ligand in coordination chemistry, where it can stabilize metal complexes. It also serves as a reagent in organic synthesis, particularly in the purification of reaction products by crystallization.
Safety and handling
Triphenylphosphine oxide is generally considered to be of low toxicity, but it should be handled with care to avoid inhalation or contact with skin and eyes. Standard laboratory safety procedures should be followed when working with this compound.
Related pages
Triphenylphosphine_oxide
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