. American chemical journal . to 6 volts and i. oto o. 6 ampere, 20 cc. of this solution were reduced in the man-ner described above. Reduction of Cacodyl. 50 cc. minus Residual Number of Total Burette burette gas Dimethyl- experiment. hydrogen. gas. gas. (AgNOj). arsine. I 50 2 100 37 4 37 3 0. I 3 150 38 9 II .1 38 5 4 200 40 3 9-7 39 6 5 250 41 8 41 I 6 300 43 6 42 6 I .0 7 350 46 2 3-8 44 8 1-4 8 400 47 6 45 7 19 9 450 49 I 46 6 10 500 50 4 — 47 0 3-4 II 550 52 0 — 48 0 12 600 52 8 — 49 0 3-8 13 650 54 0 — 49 0 50 14 7
. American chemical journal . to 6 volts and i. oto o. 6 ampere, 20 cc. of this solution were reduced in the man-ner described above. Reduction of Cacodyl. 50 cc. minus Residual Number of Total Burette burette gas Dimethyl- experiment. hydrogen. gas. gas. (AgNOj). arsine. I 50 2 100 37 4 37 3 0. I 3 150 38 9 II .1 38 5 4 200 40 3 9-7 39 6 5 250 41 8 41 I 6 300 43 6 42 6 I .0 7 350 46 2 3-8 44 8 1-4 8 400 47 6 45 7 19 9 450 49 I 46 6 10 500 50 4 — 47 0 3-4 II 550 52 0 — 48 0 12 600 52 8 — 49 0 3-8 13 650 54 0 — 49 0 50 14 700 55 0 —50 49 8 5-2 15 750 55 6 -5-6 50 I 5-5 Dekn. Reduction of Cacodyl—(Contintied). I. II. Number of Total experiment, hydrogen. 800 850 1617 182022 24262830 9001000IIOO1200130014001500 Burettegas. 55 9 55-855-755-153 gas. —5-9-5-8—5-7—51—3 9— + gas(AgNOs). Dimethyl-arsine. 5-6 I iI § § § § § § § § iI I i ill i I ^ REDUCTION orCACODYL. ^^^iiN? Fig. V, That the burette readings were not immediately greaterthan the voltameter readings or, in other words, that the com-posite curve of reduction was not more nearly coincidentwith the dimethylarsine curve, is explained by the facts (i)that it is almost impossible to prepare and to handle purecacodyl without its becoming oxidized, (2) crude cacodylcontains large quantities of cacodylic oxide, and (3) dimethyl-arsine is somewhat soluble in the above mentioned cathode Reactions of the Arsines. 103 solution. However, the curves show sufRciently well thatcacodyl is electrolytically reduced to dimethylarsine. In view of the above experiments and since dimethylarsineis easily prepared from cacodylic acid by reduction with zincand hydrochloric acid, it might be supposed that the elec-tric current would induce the same reaction: (CH3)2AsOOH + 4H = (CH3)2AsH + 2H2O. However, experiments showed that no arsine was evolved;an explanation of this is seen in
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