Platinic oxide

Seheuing and Winterhalder treated 2 6-distr3rrylpyridine tetra-bromide with potassium hydroxide in alcohol, so producing 2 6-di-)3-phenylacetylenylpyridine (XI) which by the action of 50 per cent, sulphuric acid was converted into 2 6-diphenacylpyridine (XII), and this, on hydrogenation in presence of platinic oxide, barium sulphate and methyl alcohol, was reduced to 2 6-di-(6-hydroxy-(6-phenylethylpyridine, and the hydrochloride of this, on similar catalytic hydrogenation, yielded worlobelanidine (XIII). This can be methylated to lobelanidine, from which in turn dMobeline and lobelanine can be obtained. 

Dextrorotatory Series, Using palladium or platinic oxide as catalyst, in glacial acetic acid, with hydrogen at a pressure of 10-25 atmospheres,... 

On reduction with sodium amalgam the acid adds on two atoms of hydrogen the resulting amorphous aeid yields a crystalline dimethyl ester, C2iH2gOgN2, colourless prisms, m.p. 143-7° dec.). On hydrogenation in presenee of platinic oxide as catalyst 2 mols, of hydrogen are absorbed to form the acid, CjgHjgOgNj, colourless prisms, [ajo - -17-7° (HjO). On oxidation with chromic acid the Cjg acid is converted into Wieland s Ci7 acid and Hanssen s Cjg acid. ... 

Heliotrine, CigH2,05N, m.p. 125-6°, [ajn — 75° (CHCI3), yields a methiodide, m.p. 108-111°, and contains one methoxyl group, two hydroxyl groups and a tertiary nitrogen atom. On alkaline hydrolysis it forms heliotridine (p. 607) and heliotric acid (p. 613). In presence of platinic oxide it absorbs two molecules of hydrogen and affords, as scission products, heliotric acid and hydroxyheliotridane (p. 607). 

The (ZZ-ephedrine was resolved into its components by the use of d-and Z-mandelic acids. In 1921 Neuberg and Hirsch showed that benz-aldehyde was reduced by yeast, fermenting in suerose or glueose solution to benzyl aleohol and a phenylpropanolone, which proved to be Z-Ph. CHOH. CO. CH3. This ean be simultaneously, or consecutively, eondensed with methylamine and then eonverted to Z-ephedrine by reduction, e.g., with aluminium amalgam in moist ether, or by hydrogen in presenee of platinic oxide as catalyst (Knoll, Hildebrant and Klavehn ). 

Under similar conditions, but with palladised charcoal as catalyst, solasodine forms a dihydro-derivative, C27H45O2N, m.p. 208-5-210-5°, [a] ° — 63-5° (CHCI3), and in presence of platinic oxide, a tetrahydro-derivative, C27H4,02N, which is dimorphic, m.p. 292-5°, and 285-291°, [air - 4-94° (CHCI3). 

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. 

Platin-oxyd, n. platinum oxide, specif, platinic oxide, platinum(IV) oxide. -oxydul, n. platinous oxide, platinum(II) oxide, -oxy-dulverbindung, /. platinous compoimd, platinum (II) compound, -oxydverbindung, /. platinic compound, specif, platinum (IV) compound. 

Platinic oxide has been prepared previously by the interaction of platinic chloride and excess sodium hydroxide.4 Since the catalyst itself is platinum black, the other methods for its preparation are given below. 

Formula Pt02 MW 227.08 forms mono-, di-, and tetrahydrates Synonyms platinum(lV) oxide platinic oxide Adams catalyst... 

Platinous Oxide, Platinum Monoxide, PtO, is produced2 in the anhydrous condition in the form of superficial blackening when platinum, either in the form of sponge or of thin foil, is heated m dry oxygen at about 450° 0., the product containing as much as 43 per cent, of oxide. 

When heated, platinous oxide decomposes, yielding metallic platinum and its dioxide.3... 

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