Abstract
Three different synthetic routes have been explored for the synthesis of the mono-N-substituted phosphinoamine N-ethyl, N′bis[2(diphenylphosphino)phenyl]propane-1,3-diamine: (a) selective alkylation of N,N′bis[2(diphenylphosphino)phenyl]propane-1,3-diamine; (b) linkage of the different fragments of N-ethyl, N′bis[2(diphenylphosphino)phenyl]propane-1,3-diamine; (c) selective acylation of N,N′bis[2(diphenylphosphino)phenyl]propane-1,3-diamine followed by acetyl reduction. While approaches (a) and (b) were unsuccessful, N-ethyl, N′bis[2(diphenylphosphino)phenyl]propane-1,3-diamine was obtained by route (c) via separation of the mono- and di-alkylated P 2N 2-species obtained from reduction, through complexation of Ni(NO 3) 26H 2O followed by demetallation reaction with KCN. Additional related phosphinoamine chelates and phosphonium adducts were synthesized and characterized by conventional physico–chemical techniques.
Published Version
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