Potassium hexacyanodinickelate

A related reaction is the conversion of vinyl bromides into vinyl cyanides by reaction with potassium hexacyanodinickelate,6 as shown for the reaction of trans-1 -bromo-2-phenylethylene. 

Potassium 2,6-di-f-butylphenoxide, 234—237 Potassium dichromate, 337 Potassium 2,6-dimethylphenoxide, 235 Potassium ferricyanide, 192, 331 Potassium hexacyanodinickelate, 212 Potassium hydroxide, 238 Potassium 2-methylphenoxide, 235 Potassium nitrosodisulfonate, 7, 8, 238 Potassium periodate, 243 Potassium permanganate, 337 Potassium persulfate, 238-239 Potassium phenoxide, 235 Potassium phthalimide, 67 Prednisone-BMD, 261, 262 Al4,16.pregnadiene-20-ones, 324 5oPregnane-3,20-dione, 327, 328 50f-Pregnane-3,20-dione 3-dimethyl acetal, 327, 328... 

Nickel powder, synthesis 56 Potassium hexacyanodinickel-ate(I), synthesis 57 Sodium and potassium nickel(IV) paraperiodates, synthesis 58... 

Potassium hexacyanodinickelate-(I), synthesis 57 Ammonium hexabromoosmate-(IV), synthesis 59 Ammonium hexachloroosmate-(IV), synthesis 60... 

Potassium hexacyanodinickelate(I) is a bright red compound which reacts slowly in air to form a yellow solid. It is insoluble in ethanol and liquid ammonia but dissolves readily in water, giving a blood-red solution with strong reducing properties. In the presence of excess cyanide ion the unipositive nickel is rapidly oxidized by water to the dipositive condition. It has been reported1 that acidification of aqueous solutions of the complex results in the precipitation of nickel(I) cyanide and that the latter dissolves in aqueous potassium cyanide with the formation of the original complex. Solutions of the unipositive nickel complex rapidly absorb carbon monoxide... 

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