Beiträge zur Chemie des Phosphors, 113 [1, 2] Synthese und Eigenschaften des Azadiphosphirans (t-BuP)2N(i-Pr) / Contributions to the Chemistry of Phosphorus, 113 [1, 2] Synthesis and Properties of the Azadiphosphirane (t-BuP)2N(i-Pr)

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Abstract
1-Isopropyl-2,3-di-tert-butyl-1,2,3-azadiphosphirane (1) was synthesized by [2+1] cyclocondensation of Cl(t-Bu)P-P(t-Bu)Cl with (Me3Sn)2N(i-Pr) at 75 °C. 1 could be isolated in pure state by fractional distillation and is stable at room temperature under inert conditions. The temperature independent 31P NMR spectrum indicates that the arrangement at the nitrogen atom is planar, probably due to dative π-bonds from nitrogen to the phosphorus atoms