Summary
Although the thermal cyclooligomerization of the phosphaalkyne 10 (≡ 4; R = tBu) proceeds non-selectively to furnish a mixture of 11, 12, and 13, the tetraphosphacubane 11 can be obtained in high yield from the reaction of the zirconium complex 15 with hexachloroethane. This reaction provides the starting point for numerous functionalization reactions at the phosphorus atoms of the pentacyclic system (→ 27–38, 40, and 42–46). In the presence of aluminium trihalides the phosphaalkynes 4 (R = tBu, 1-Ad) undergo spirocyclization with incorporation of the Lewis acid to furnish the 1,3-diphosphete betaines 50. Removal of the Lewis acid moiety by treatment with DMSO induces a rearrangement to the Dewar phosphabenzenes 52 and 53 which, in turn, can be trapped by homo-Diels-Alder reactions with the phosphaalkyne 10 (→ 54, 55). Isomerization reactions among the phosphaalkyne cyclotetramers 54, 55, 13, and 57 are discussed; they are in accord with the calculated heats of formation for the respective, unsubstituted molecules.
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References
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© 1993 Friedr. Vieweg & Sohn Verlagsgesellschaft mbH, Braunschweig/Wiesbaden
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Regitz, M. (1993). Synthetic Aspects of the Metal-Mediated Cyclooligomerization of Phosphaalkynes. In: Enders, D., Gais, HJ., Keim, W. (eds) Organic Synthesis via Organometallics (OSM 4). Vieweg+Teubner Verlag. https://doi.org/10.1007/978-3-322-84062-2_8
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