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Isothiocyanates. XVI. Preparation of isothiocyanates with labeled 35S

J. Augustín, Ľ. Drobnica, and F. Kouřil

Slovak Technical University, Bratislava


Abstract:  The prepn. of isothiocyanates (I), labeled with 35S on the functional group NCS, was accomplished by applying isotopic exchange between the elementary 35S and I. It was detd. that at 180° the isotopic exchange occurs with a sufficient velocity without the application of a high-boiling solvent with mono- and polynuclear aromatic and alicyclic derivs. of I with a negligible thermal decompn. (below 5.0%). The reaction time is 4 hrs. and 35S is cryst. The general equation is: RNCS + 35S .dblharw. RNC35S + S. For the detns., a radiochromatographic method on thin layer Al2O3 was applied. These RNC35S were prepd.: (R and μc/millimole given): Ph,324-bromophenyl, 36; 4-biphenylyl, 50; benzyl, 53; 4-bromobenzyl, 40; 1-naphthyl, 46; 2-naphthyl, 38.

Full paper in Portable Document Format: 209a687.pdf (in Slovak)


Chemical Papers 20 (9) 687–691 (1966)

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