Beiträge zur Chemie des Phosphors, 761 Tricyclohexyl-cyclotriphosphan, Pentacyclohexyl-cyclopentaphosphan und 1.2.3.4-Tetracyclohexyl-cyclo-5-carba-1.2.3.4-tetraphosphan / Contributions to the Chemistry of Phosphorus, 761Tricyclohexyl-cyclotriphosphane, Pentacyclohexyl-cyclopentaphosphane, and 1,2,3,4-Tetracyclohexyl-cyclo-5-carba-1,2,3,4-tetraphosphane

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Abstract
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.