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A phosphonium salt is a salt containing the phosphonium (PH4+) ion such as phosphonium iodide (PH4+I−). More commonly, phosphonium refer to an organic derivative such as tetraphenylphosphonium chloride, (C6H5)4P+ Cl- and tetramethylphosphonium iodide, [P(CH3)4]+I−.
Additional recommended knowledge
The reaction works well if the alkyl group is methyl or an unhindered primary alkyl group (as shown), but it is usually poor with secondary alkyl halides. Tertiary alkyl groups cannot form the ylide. The phosphonium salt is a stable compound which can often be purified by recrystallisation from ethanol.
The phosphonium acetate group does not have an impact on the subsequent Wittig reaction.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Phosphonium_salt". A list of authors is available in Wikipedia.|