Synthesis and Identification of Aryl and Alkyl Gem-Dilithium Phosphido-Boranes: A Boost to the Chemistry of Phosphandiides.

摘要: The synthesis and identification of unprecedented gem-dianionic phosphorus compounds, that is, gem-dilithium phosphido-boranes Li2 [RP⋅BH3 ], with R=Ph or Cy, are reported in THF solution. These were obtained by double deprotonation the corresponding primary phosphine-borane precursors RPH2 ⋅BH3 . Their in-depth structural study, based on multinuclear (1 H, 6 Li, 7 11 B, 13 C, 31 P) mono- bi-dimensional NMR analyses, indicates a strong influence substituent structure structure; monomeric arrangement was when R=phenyl, whereas cyclic oligomer observed for R=cyclohexyl. compounds represent new type useful reagent, their access paves way concept "RP synthons" (i.e., RP2- phosphandiides), likely to be most flexible variety targets.