Tricyclohexyl-cyclotriphosphane, (c-C6H11P)3 (1), is another relatively stable compound with a three membered phosphorus ring. It is produced in the reactions of (a) K2(c-C6H11P)4 with CH2Cl2, (b) K2(c-C6H11P)4 with CS2, (c) c-C6H11PCl2 with sodium in dioxane. The following by-products are formed: (c-C6H11P)4CH2 (3), (c-C6H11P)5 (2) and (c-C6H11P)4 in the reaction (a); mainly (c-C6H11P)4 in the reaction (b); (c-C6H11P)5 (2) and (c-C6H11P)4 in the reaction (c). The P3 ring compound 1 and the P5 ring compound 2 can be isolated in a pure state. The oligomers (c-C6H11P)n, n = 3, 4, 5, clearly are distinguished by the melting points, the molecular masses and by the 31P NMR and vibrational spectra. The 31P NMR parameters of 3 are reported. The cyclohexyl groups in 1, 2 and 3 are situated on both sides of the corresponding ring systems, giving rise to a maximum number of “trans” orientated neighboring substituents.
Das bei Raumtemp‐ unter Inertgas beständige Cyclotriphosphin (IIa) ist das Hauptprodukt der Umsetzung des Dik.a1ium‐cyclophosphids (II) mit Methylenchlorid oder Schwefelkohlenstoff in THF oder von Cyclohexyldichlorphosphin mit Na in Dioxan.
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