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H2N

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Originally appearing in Volume V22, Page 665 of the 1911 Encyclopedia Britannica.
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H2N CN HN•C:NH HN•C•See also:

NH2 HN•C•N Various thiopurins have been obtained by E. See also:Fischer (Ber., 1898, 31, p. 431), principally by acting with See also:potassium sulphydrate on chlorinated See also:purin compounds. 2.6.8-Trithiopurin is obtained from the corresponding trichlorpurin and potassium sulphydrate. It forms a See also:light yellow See also:mass which carbonizes on See also:heating. It is almost insoluble in See also:water and See also:alcohol; but readily dissolves in dilute solutions of the See also:caustic alkalis and of See also:ammonia. Much See also:work has been done by J. Tafel (Ber., 1900, seq.) on the electrolytic reduction of the members of the purin See also:group. The substance to be reduced is dissolved in a 50–75% See also:solution of sulphuric See also:acid and placed in a porous See also:cell containing a See also:lead See also:cathode, the whole being then placed in a 2o–6o% solution of sulphuric acid in the anode cell. It is found that xanthine and its homologues take up four atoms of See also:hydrogen per See also:molecule and give rise to the so-called desoxy-compounds, which are stronger bases than the See also:original substances. Uric acid takes up six hydrogen atoms per molecule and gives purone, C5HEN402, and it is apparently the See also:oxygen See also:atom attached to the See also: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 See also:urea residues, which necessitates the presence of the> CO See also:groups in positions 2 and 8.

(F. G. P.

End of Article: H2N

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