Taylor, Edward C. published the artcileA new synthesis of aminomalononitrile tosylate, Synthetic Route of 5098-14-6, the publication is Synthesis (1980), 801-2, database is CAplus.
The title salt (I) was prepared from NaCH(CN)2. Thus, 2,4,6-Me3C6H2SO2ONH2 was added to NaCH(CN)2 in THF, the mixture stirred under N2 2.5 h at 0°, the 2,4,6-Me3C6H2SO3Na formed was separated, 4-MeC6H4SO3H added, and the mixture refrigerated overnight to give I.
Synthesis published new progress about 5098-14-6. 5098-14-6 belongs to nitriles-buliding-blocks, auxiliary class Nitrile,Salt,Sulfonic acid,Amine,Benzene, name is 2-Aminomalononitrile 4-methylbenzenesulfonate, and the molecular formula is C4H4OS, Synthetic Route of 5098-14-6.
Referemce:
https://en.wikipedia.org/wiki/Nitrile,
Nitriles – Chemistry LibreTexts