Copper sulfides have been grown on a copper anode from an acidic solution saturated with
H2S
under a constant current. A theoretical model for the scale growth has been derived for steady‐state conditions. From the set of experimental data, the cuprous ionic diffusivity of chalcocite and digenite in the scale have been calculated in the range of temperature from 30° to 73°C. The measured diffusion coefficient of cuprous ion in low chalcocite was found to be DCu+=8.1×10−3exp)(−5870T )(cm2sec−1 and in low digenite DCu+=3.6×10−2exp)(−6100T )(cm2sec−1 The calculation of the activation entropy for diffusion in both phases is attempted.
Chlorhydrate des Typs (I), welche aus N‐substituierten Taurinen hergestellt werden können, lassen sich zu den Titelverbindungen (IIa)‐(IIc) cyclisieren.
Die Dialkyl‐allophanoylbenzirnidate (I) ‐ dargestellt aus Alkylisocyanaten und Ethylbenzimidat ‐ reagieren mit NH3 in Ethanol zu den Allophanoylbenzamidinen (II).
Die aus dem Benzimidat (I) und den Isocyanaten (II) dargestellten Carbamoylimidate (III) reagie ren weiter mit den entsprechenden Isocyanaten (II) zu den entsprechend disubstituierten Allophanoyl‐Derivaten (IV) bzw. (V); die Verbindungen (IV) entstehen auch direkt bei der Umsetzung von (I) mit 2 Molen (II) (16 h, 120‐140°C).
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