Basic zinc carbonate carbon atom

In the ketone method, the central carbon atom is derived from phosgene (qv). A diarylketone is prepared from phosgene and a tertiary arylamine and then condenses with another mole of a tertiary arylamine (same or different) in the presence of phosphoms oxychloride or zinc chloride. The dye is produced directly without an oxidation step. Thus, ethyl violet [2390-59-2] Cl Basic Violet 4 (15), is prepared from 4,4 -bis(diethylamino)benzophenone with diethylaruline in the presence of phosphoms oxychloride. This reaction is very useful for the preparation of unsymmetrical dyes. Condensation of 4,4 -bis(dimethylamino)benzophenone [90-94-8] (Michler s ketone) with AJ-phenjl-l-naphthylamine gives the Victoria Blue B [2580-56-5] Cl Basic Blue 26, which is used for coloring paper and producing ballpoint pen pastes and inks. 

Figure 9.42 Secondary Building Units (SBU) using carboxylates with rigid coordination geometries that replace metal ions as vertices in MOFs. (a) Paddlewheel or lantern structure as in 9.17, (b) octahedral basic zinc acetate SBU used in MOF-5 and (c) a trigonal prismatic oxo-centred trimer. The poly-hedra use carboxylate carbon atoms as their vertices and the MOFs propagate via the linkers attached to these carbon atoms. The metal atoms are bound to only terminal ligands in addition to those shown.

In this simplified scheme (the participation of the adjacent zinc atom as the nucleophilic attack carrier is omitted), the formation of poly(propylene ether-carbonate) characterised by a regioregular head-to-tail structure is shown. This is possible because of the nucleophilic attack on the Cp atom of the neighbouring ring to that coordinating with its more basic oxygen atom to the metal atom. Actually, the predominant head-to-tail structure of the poly(propylene ether carbonate) obtained at 80 °C with the diethylzinc-pyrogallol-water (3 1 0.5) catalyst has been proved [146]. 

Precvirsors obtained from the precipitation from both solutions of raw metal salts and alkali are composed of basic carbonates of copper and zinc such as malachite (MA) CU2CO3 (0H)2, aurichalcite (AU) (Zn,Cu)5(C03)2(OH)5, and hydrozincite (HZ) Zn5(C03)2(0H)g. For the ratio of Cu to Zn in industrial catalysts, the precursor would not exist as mono-phasic. Even if it seems to be monophasic, the atomic ratio of Cu to Zn in the double salts would be continuously variable. Since amorphous intermediates of the precursor are also known, the real phase cannot be well characterized by XRD measurements. Of course the structure and distribution of precursors are also very sensitive to the precipitation conditions (temperature, rate, pH, etc.) as well as precipitation agents. Consequently, the characteristics of precursors are not determined only by the starting composition. 

X-ray crystallographic data), a bicarbonate ion at the active site is shown in red, the zinc cation at the active site is green, a water molecule is shown in blue, and the basic sites that coordinate with the zinc cation (as Lewis bases) or remove the proton from water to form hydroxide (as Bronsted-Lowry bases) are magenta (these bases are nitrogen atoms from histidine imidazole rings). No hydrogen atoms are shown in any of these species. As you can see, a remarkable orchestration of Lewis and Bronsted-Lowry acid-base reactions is involved in catalysis by carbonic anhydrase. 

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