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The reaction of perfluoro-2-phosphapropene F 3 CP=CF 2  (1) with tert-butylamine or isopropylamine in a 1:3 molar ratio leads to the novel iminomethylene phosphanes F 3 CP=C=N(tBu) [(2), 30% yield] and F 3 CP=C=N(iPr) [(3), 5%], respectively. 2 slowly decomposes at room temperature giving tert-butylisonitrile and the cyclophosphanes (F 3 CP) n  (n = 3, 4, 5). 3 is found to be less stable than 2 and for example is attacked by primary amines. The reaction of 2 with 2,3-dimethyl-1,3-butadiene or trimethylphosphane yields, on the one hand, the cycloaddition product of bis(trifluormethyl)diphosphene (4), and on the other hand, the phosphorus ylid Me 3 P=PCF 3  (5) together with (tBu)NC.

zeitschrift für naturforschung b

Reaktive E=C(p-p)π-Systeme, XXVIII / Reactive E=C(p-p)π-Systems, XXVIII: Synthese und Reaktivität des Iminomethylenphosphans F 3 C-P=C=N-tBu / Synthesis and Reactivity of the Iminomethylenephosphane F 3 C-P=C=N-tBu