Organometallic compounds, also from aryl halides

As described above, the initial [Pd]—R complex can be formed by the transfer of R from another organometallic RM. Compounds of mercury, boron or tin have often been used. Alternatively an aryl, heteroaromatic or vinyl halide is added to PdL, generated in situ from PdL or by reduction of L PdX. In the second method a base such as a tertiary amine is also required to react with the hydrogen halide which is produced. 

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