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Issue 5, 2016
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Synthesis of the first metal-free phosphanylphosphonate and its use in the “phospha–Wittig–Horner” reaction

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Abstract

The synthesis of the first phophanylphosphonate, Mes*PH–PO(OEt)2 (2-H), in which the P(III) centre is not coordinated by a M(CO)5 (M = W, Mo, Cr) fragment is reported. The title compound reacts with LDA under the formation of 2-Li which is best described as the enolate form with a high double bond character between the two phosphorus centres. 2-Li is shown to engage in the phospha–Wittig–Horner reaction and converts aldehydes into phosphaalkenes that are metal-free and thus available for future manipulations at the phophorus lone pair. Using a selection of aldehydes with aliphatic, aromatic or vinylic substituents as substrates, phosphaalkene formation proceeds in high yields and high E-selectivity. The selectivity is however compromised during purification on standard silica which was found to promote E/Z isomerization.

Graphical abstract: Synthesis of the first metal-free phosphanylphosphonate and its use in the “phospha–Wittig–Horner” reaction

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The article was received on 21 Sep 2015, accepted on 26 Oct 2015 and first published on 09 Nov 2015


Article type: Paper
DOI: 10.1039/C5DT03686K
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Dalton Trans., 2016,45, 2201-2207

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    Synthesis of the first metal-free phosphanylphosphonate and its use in the “phospha–Wittig–Horner” reaction

    K. Esfandiarfard, A. I. Arkhypchuk, A. Orthaber and S. Ott, Dalton Trans., 2016, 45, 2201
    DOI: 10.1039/C5DT03686K

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