Vier-und fünfgliedrige Phosphorheterocyclen, XXXIV Cycloaddukte aus Phosphazenen der Koordinationszahl 2, 3 und 4 /Four-and Five-Membered Phosphorus Heterocycles, XXXIV Cycloadducts from Phosphazenes of Coordination Number 2, 3, and 4

Abstract

Abstract Dimethyl azaphosphole (la) and aminoiminophosphine (2) give the first example of a [2 + 2]-Cycloaddition of a2- and c^-phosphazenes. The resulting diazadiphosphetidine (4) dissociates reversibly. For the corresponding cycloadduct from l a and the aminodiiminophosphine (3) a rapid exchange of the exocyclic imino group and the ring nitrogen via a zwitterionic form is observed.