There is evidence from the reaction of 1,3,5 trinitrobenzene with excess cyanide in methanol that methanolysis of the cyanide ion produces a significant concentration of methoxide ions, which may also attack the substrate. A methanolysis constant of approximately 4xl0(^ 4)moldm(^ 3) has been calculated, which leads to a value of 13.52 for the pK(_a) of hydrogen cyanide in methanol. The reaction of a slight excess of potassium cyanide with meta dinitrobenzene in methanol has been previously reported to yield 2 methoxy 6 nitrobenzonitrile.
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