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Futhermore There are relatively few mercury(I) or mercurous compounds.
Furthermore The mercury(I) ion, Hg22+, is diatomic and stable.
Mercury(I) chloride, Hg2Cl2 (commonly known as calomel),
Furthermore is probably the most important univalent compound.
It is used in antiseptic salves. Mercury(II) chloride, HgCl2
Furthermore (also called bichloride of mercury or corrosive sublimate),
is perhaps the commonest bivalent compound.
Although extremely toxic, this odourless, colourless substance
Furthermore has a wide variety of applications. In agriculture it is used as a
fungicide; in medicine it is sometimes employed as a topical
Furthermore antiseptic in concentrations of one part per 2,000 parts of water;
and in the chemical industry it serves as a catalyst in the manufacture
Furthermore of vinyl chloride and as a starting material in the production of
other mercury compounds. Mercury(II) oxide, HgO,
Furthermore provides elemental mercury for the preparation of various
organic mercury compounds and certain inorganic mercury salts.
Furthermore This red or yellow crystalline solid is also used as an electrode
Furthermore (mixed with graphite) in zinc-mercuric oxide electric cells and in
mercury batteries. Mercury(II) sulfide, HgS, is a black or red crystalline solid
Furthermore used chiefly as a pigment in paints, rubber, and plastics.
PRIMARY BATTERIES – AQUEOUS SYSTEMS | Zinc–Mercury
Furthermore K. Kordesch, W. Taucher-Mautner, in Encyclopedia of Electrochemical Power Sources, 2009
Constructions and Configurations
A zinc–mercuric oxide cell of early design is shown in Figure 1.
Furthermore The subsequent and more practical, better performing mercuric oxide
batteries follow different designs: button cells, flat-pellet cells,
Furthermore and cylindrical cell constructions.
Furthermore The button cell anode is a gelled mass of amalgamated powdered zinc. The whole top assembly presses down on an absorbent material, which contains most of the alkaline electrolyte. A barrier separator prevents shorts between Furthermore the cathode (a mercuric oxide–graphite mix) and the zinc powder. The can is made of nickel-plated steel (Figure 2).
The mercuric oxide–cadmium button cell uses a similar design.
Furthermore The flat pellet cell is a form of larger-sized zinc–mercuric oxide cell.
The zinc powder is pressed into pellets with sufficient porosity to hold the electrolyte.
Furthermore The cell uses two nickel-plated stainless-steel cans with a tube connector between them.
Any pressure developed in the inner can escape into the outer can, which has a vent.
Furthermore This is a safety precaution to avoid any electrolyte leakage. Figure 3 shows a flat pellet cell.
Furthermore The larger cylindrical zinc–mercuric oxide cell was built in various ways.
Figure 4 shows a cell with the rigid central anode pellets pressed against
Furthermore the cell top by the neoprene insulator slug on the bottom.
Other types had a large inner nail connecting the dispersed anodes to the top.
Furthermore A common feature of the pellet cells was the use of two cans and a vent Furthermore
mechanism between them on the bottom. The soaked barrier layer separates
the zinc anode assembly from the outer cathodes.
A considerable improvement, especially at lower temperatures, Furthermore
Furthermore was achieved with the wound anode (jelly-roll) configuration shown in Figure 5.
The wound zinc anode consists of a long strip of corrugated zinc interleaved Furthermore
Furthermore with a layer of absorbent paper. The paper swells in the electrolyte and forms
a tight structure. The zinc upper edge is touching the top. The cathode is on the bottom.
Furthermore There is no free electrolyte. Again, there is a double can structure with a vent on the bottom.
Synthesis: Carbon with One Heteroatom Attached by a Multiple Bond
Furthermore Joseph P. Michael, Charles B. De Koning, in Comprehensive Organic Functional Group Transformations, 1995
184.108.40.206.1.(v) Eliminations from thioamides and their derivatives
Ketenimines have been prepared from secondary thioamides by formal
Furthermore elimination of hydrogen sulfide upon treatment with mercuric oxide
<62AG(E)512, 70BCJ1874>. Eliminations from sulfone-substituted thioamides,
Furthermore diisopropylcarbodiimide and acetyl chloride; the reaction afforded stable
bis(ethanesulfonyl) ketenimines, (EtSO2)2CCNR (R = Me, Pri, Ph),
Furthermore in yields of 53–87% <66CB3163>. Mitsunobu conditions Furthermore
(diethyl azodicarboxylate and triphenylphosphine) have been used for inducing
Furthermore elimination from N-aryldiphenylthioacetamides, Ph2CHCSNHAr, Furthermore
but the ketenimines Ph2CCNAr proved to be difficult to separate from
by-products <71BCJ1362>. For formal 1,4 elimination from Furthermore
3-aminothioacrylamides (Equation (4)), both diisopropylcarbodiimide
Furthermore as activating agents; in most cases, the unstable imino ketenimines were
immediately treated with aniline to give amidines, the yields of which
(49–81%) indicated that the elimination step was, in general, efficient <80CB2509> Furthermore
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