Applications in Organic Synthesis
NiCl2 and its hydrate are occasionally useful in organic synthesis.
- As a mild Lewis acid, e.g. for the regioselective isomerization of dienols:
- In combination with CrCl2 for the coupling of an aldehyde and a vinylic iodide to give allylic alcohols.
- For selective reductions in the presence of LiAlH4, e.g. for the conversion of alkenes to alkanes.
- As a precursor to nickel boride, prepared in situ from NiCl2 and NaBH4. This reagent behaves like Raney Nickel, comprising an efficient system for hydrogenation of unsaturated carbonyl compounds.
- As a precursor to finely divided Ni by reduction with Zn, for the reduction of aldehydes, alkenes, and nitro aromatic compounds. This reagent also promotes homo-coupling reactions, that is 2RX → R-R where R = aryl, vinyl.
- As a catalyst for making dialkyl arylphosphonates from phosphites and aryl iodide, ArI:
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- ArI + P(OEt)3 → ArP(O)(OEt)2 + EtI
Read more about this topic: Nickel(II) Chloride
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