The invention relates to a
phosphonium salt compound containing precursor of biphosphorus
ylide cyclopentadienyl cyclocarbene as well as a preparation method and application thereof, which belong to the field of
organic synthesis. The adopted technical scheme is as follows: the general formula of the
phosphonium salt compound containing precursor of biphosphorus
ylide cyclopentadienyl cyclocarbene: FORMULA, wherein R is
alkyl or
aryl, X is selected from F-, Cl-, Br-, I-, PF6-, BF4-, SbF6-, ClO4- or N3-. The preparation method of the
phosphonium salt compound comprises the following steps of: adding 1, 1'-
ferrocene bimercury compound,
tertiary phosphine PR3 and
palladium chloride to an
organic solvent, refluxing under protection of N2, filtering, evaporating to
dryness and recrystallizing to obtain the
phosphonium salt compound. In addition, in the invention, the
phosphonium salt compound is used as a catalyst ligand so that the
phosphonium salt compound and the
metal salt act togetherto catalyze and synthesize alpha-
aryl derivatives of carbonyl compound by one step. The application test indicates that compared with traditional N-heterocyclocarbene ligand, the phosphonium salt compound has excellent catalytic activity.