Löwe P, Feldt M, Röthel MB, Wilm LFB, Dielmann F. Thiophosphonium-Alkyne Cycloaddition Reactions: A Heavy Congener of the Carbonyl-Alkyne Metathesis.
Inorg Chem 2021;
60:14509-14514. [PMID:
34524817 PMCID:
PMC8493552 DOI:
10.1021/acs.inorgchem.1c02076]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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While the metathesis
reaction between alkynes and thiocarbonyl
compounds has been thoroughly studied, the reactivity of alkynes with
isoelectronic main group R2E=S compounds is rarely reported
and unknown for [R2P=S]+ analogues. We show
that thiophosphonium ions, which are the isoelectronic phosphorus
congeners to thiocarbonyl compounds, undergo [2 + 2]-cycloaddition
reactions with different alkynes to generate 1,2-thiaphosphete ions.
The four-membered ring species are in an equilibrium state with the
corresponding P=C–C=S heterodiene structure and thus undergo
hetero-Diels–Alder reactions with acetonitrile. Heteroatom
and substituent effects on the energy profile of the 1,2-thiaphosphete
formation were elucidated by means of quantum chemical methods.
We show that thiophosphonium ions, which
are the isoelectronic
phosphorus congeners to thiocarbonyl compounds, undergo [2 + 2]-cycloaddition
reactions with different alkynes to generate 1,2-thiaphosphete ions.
The four-membered ring species are in an equilibrium state with the
corresponding P=C−C=S heterodiene structure and thus undergo
hetero-Diels−Alder reactions with acetonitrile. Heteroatom
and substituent effects on the energy profile of the 1,2-thiaphosphete
formation were elucidated by means of quantum chemical methods.
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