Reactions of chlorophosphenium salts with 1,1,3,3-tetraalkyl-2-trimethylsilylguanidines. Molecular structures of new heterocyclic systems: [R2NPN{C(NR2)2}]22+ and [R2NP{N[C(NR2)2]}]2AlCl3

Abstract

The reactions of phosphenium salts (Cl–P⁺–NR₂)A^–(A = AlCl₄, CF₃SQ₃)1 with guanidines (R₂N)₂CNSiMe₃2 afford dicationic 1,3-bis[bis(dialkylamino)methylene]-1,3-diazonia-2λ³, 4λ³-diphosphacyclobutanes 3 or 1,3-bis[bis(dialkylamino)methylene]-1,3-diazonia-2λ³-phospha-4,4,4-trichloroaluminacyclobutanes 5, depending on the experimental conditions.