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Encyclopedia Britannica - Main :: GUI-HAN |
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H2N CN HNC:NH HNCNH2 HNCN Various thiopurins have been obtained by E. Fischer (Ber., 1898, 31, p. 431), principally by acting with potassium sulphydrate on chlorinated purin compounds. 2.6.8-Trithiopurin is obtained from the corresponding trichlorpurin and potassium sulphydrate. It forms a light yellow mass which carbonizes on heating
alcohol
caustic
ammonia
Much work
group
cell containing a lead cathode, the whole being then placed in a 2o6o% solution of sulphuric acid in the anode cell . It is found that xanthine and its homologues take up four atoms of hydrogen per molecule and give rise to the so-called desoxy-compounds, which are stronger bases than the original
molecule and gives purone, C5HEN402, and it is apparently the oxygen atom attached to the carbon atom number 6 which is replaced by hydrogen, since when purone is heated with baryta, two molecules of carbon dioxide are liberated for one of purone. Consequently purone must contain two urea residues, which necessitates the presence of the> CO groups in positions 2 and 8. (F. G. P. *)End of Article: H2N If you wish, you can link directly to this article.
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