Abstract
The direct chlorine-free incorporation of P1 units into organic molecules has very
important synthetical value owing to environmental considerations and the prospect of accessing
unique compounds with fascinating structures and useful properties. This selective
survey presents a panorama of phosphorus species that are synthetic equivalents of free
singlet phosphinidenes [R-P] and highlights the state-of-art of the [RP]-transfer reactions
with emphasis on the synthesis of molecular architectures difficult to reach using traditional
methods. Among stabilized phosphinidene precursors capable of RP-transfer are terminal
transition-metal phosphinidene and phosphinidenoid complexes, dibenzo-7λ3-
phosphinobornadienes, phosphinidene-phosphoranes, inversely polarized phosphaalkenes,
phosphaketenes, intramolecularly base-stabilized phosphinidenes, (cyclo)polyphosphines
and diphosphenes.
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