Abstract
The determination method for benzyl thiocyanate using alkali polysulfide, described in the previous paper, was extended to other thiocyanate compounds and found that the method can be applied generally. A microdetection method for thiocyanate group was also proposed (in which a drop of Na2S3 or Na2S4 is added to one drop of the alcoholic solution of the sample, warmed for 1 minute in a water bath, and 1 drop of 10% H2SO4 is added. After warming the mixture for some time, 1 drop of 1% HCl solution of FeCl3 is added after the mixture has cooled and a red coloration appears in the presence of a thiocyanate compound. Limit of detection is 1 γ, and the limit of concentration is 1:10, 000 to 1:15, 000). The corresponding disulfides were isolated in 80-90% yield from the reaction of phenyl-, 2-carboxyphenyl-, 2, 4-dinitrophenyl-, and 4-methoxynaphthyl thiocyanate and thiocyanoacetanilide with sodium trisulfide. All the disulfides were isolated and identified. For the reaction of a thiocyanate compound and alkali polysulfide, a general formula (1) was forwarded and radical reactions (2-4) were assumed for it.
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