Synthesis of New Examples of Corands with 16-Membered P,N-Containing Core Ring

Abstract

An effective strategy of the synthesis of P,N-containing corands with 16-membered core ring is described. It is based on covalent self-assembly processes in the course of Mannich-type condensations in three component systems: bis(mesitylphosphino)propane-formaldehyde-primary amines. This approach allowed the authors to obtain a series of novel functionalized 1, 9-di(aralkyl)-3,7,11,15-tetramesityl-1,9-diaza-3,7,11,15-tetraphosphacyclohexadecanes in very good yields. The study of structure of the synthesized corands showed that all of them were obtained as pure RSSRstereoisomers with similar conformations in the solid state.