The carbanions of malononitrile, ethylmalononitrile, and dimethyl malonate react with pentacyanonitrosylferrate (nitroprusside) to form highly coloured adducts. A kinetic study has shown that, in the second and third cases, there is rate-determining reaction between carbanion and nitroprusside but, in the first, the product is that formed by a second ionisation to give [Fe(CN)5N(O)C(CN)2]4–.
A. R. Butler, C. Glidewell, V. Chaipanich and J. McGinnis, J. Chem. Soc., Perkin Trans. 2, 1986, 7 DOI: 10.1039/P29860000007
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