Hydrogenation catalyst, Adams’ platinic

Forsyth et al. found that gelsemicine contains three active hydrogen atoms (Zerewitinov determination), yields a non-basic, monobenzoyl derivative, m.p. 232°, and behaves as a secondary base giving JV-methyl-gelsemicine hydriodide, m.p. 227°, on treatment with methyl iodide. It does not react with either hydroxylamine or 2 4-dinitrophenylhydrazine. On hydrogenation in dry acetic acid in presence of Adams s platinic oxide catalyst it absorbs three molecules of hydrogen. 

Also obtained by catalytic hydrogenation of 7-acetyl-4,6-dihydroxy-2-isoprope-nylcoumaran in the presence of platinic oxide (Adams catalyst) in methanol (72%) [2847]. 

Krupp and others [204] proposed that skeletal platinum, prepared by decomposition of an alloy between platinum and aluminum, should be used as catalyst. As shown by Petrii and Marvet [209], hydrogen adsorption isotheims for disperse platinum catalysts (platinized platinum, platinum Idack, Adams platinum, and various forms of skeletal platinum) in aqueous solutions of electrolytes exhibit relatively small differences. 

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