The triphenylphosphine–benzotrifuroxan reaction. Part II. Crystal and molecular structure of a ‘yellow compound’, 1,3,5-trinitro-2,4,6-tris-(triphenylphosphoranylideneamino)benzene
Abstract
The ‘yellow compound’ isolated from the reaction of benzotrifuroxan with triphenylphosphine has been shown to be 1,3,5-trinitro-2,4,6-tris(triphenylphosphoranylideneamino)benzene, together with toluene of crystalisation, by three-dimensional X-ray structure analysis. The central C6 ring is benzenoid and the planes of the nitro-groups are approximately at right angles to it. In the triphenylphosphoranylideneamino-groups the P–N bonds, mean 1.56 A, are short and the N–C bonds, mean 1.34 Å, are shorter than the O2N–C bonds, mean 1.49 Å, suggesting considerable electron delocalisation over the 2,4,6-tris(triphenylphosphoranylideneamino)benzene grouping.