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The triorganyl-nonaphosphanes(3) P 9 (i-Pr)3 (1) and P 9 (t-Bu)3 (2) have been obtained by reacting (i-PrP) 4  with PCl 3  and by dehalogenating a mixture of t-BuPCl 2  and PCl 3  with magnesium, respectively. In the case of P 9 Et 3  (3) and P 9 Me 3  (4) the latter reaction may be modified by using the organyl-cyclophosphanes (PR) n  instead of RPCl 2 . P 7 R 3  as well as other polycyclic organylphosphanes are formed as by-products. 1 could be isolated in pure form and 2 has been concentrated in the product mixture. According to their  31 P{ 1 H}-NMR spectra 1-4 possess a P 9  skeleton analogous to that of the hydrocarbon deltacyclane. 1 and 2 are formed as mixtures of two configurational isomers, which differ in the spatial arrangements of the substituent on P 5 . The results clearly indicate, that the corresponding phosphorus hydride P 9 H 3  has the same structure and is a tetracyclo[4.3.0.0 2,4 .0 3,7 ]nonaphosphane.

Beiträge zur Chemie des Phosphors, 125/Synthese und Struktur der Triorganyl-nonaphosphane(3) P 9 (i-Pr) 3 und P 9 (t-Bu) 3