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In the reaction of magnesium with trimethylchlorosilane and t-butyldichlorophosphane the hitherto unknown tri-t-butyl-cyclotriphosphane, (t-BuP) 3  (1), is produced besides the partially silylated phosphanes t-BuP(SiMe 3 ) 2  and (t-BuPSiMe 3 ) 2  as well as the cyclotetraphosphane (t-BuP) 4 . Shortly after the beginning of the reaction the amount of 1 is about 50 mole-% and decreases during the reaction time. Thermally and in solution the P 3  ring compound (1) is surprisingly stable and can be isolated in a pure state by fractional distillation. (t-BuP) 3  clearly differs from the oligomeric (t-BuP) 4  by the lower melting point, the molar mass and by the  31 P NMR and IR spectra. The t-butyl groups in 1 are situated above and below the P 3  ring plane.

Beiträge zur Chemie des Phosphors, 68 Tri-t-butyl-cyclotriphosphan.: Contributions to the Chemistry of Phosphorus, 68 Tri-t-butyl-cyclotriphosphane