Zinc, Acetate Carbonate

The commercial process for the production of vinyl acetate monomer (VAM) has evolved over the years. In the 1930s, Wacker developed a process based upon the gas-phase conversion of acetylene and acetic acid over a zinc acetate carbon-supported catalyst. This chemistry and process eventually gave way in the late 1960s to a more economically favorable gas-phase conversion of ethylene and acetic acid over a palladium-based silica-supported catalyst. Today, most of the world s vinyl acetate is derived from the ethylene-based process. The end uses of vinyl acetate are diverse and range from die protective laminate film used in automotive safety glass to polymer-based paints and adhesives. 

Magnesium Carbonate Hydroxylamine Hydrochloride Methyl Amyl Alcohol Atropine Sulfate Nitroglycerin Zinc Stearate Zinc Cyanide Zinc Acetate Carbon Tetrabromide Tetrabromomethane Skydrol LD4 Carbon Tetrachloride Tetrachloromethane Methallyl Chloride Silver Acetate Methyl Isopropyl Ketone 3-Methyl-2-Butanone Aminoacetic Acid Glycine... 

Treatment of the 1,2-oxazines 52 with carbon monoxide at 1000 psi in the presence of cobalt carbonyl brings about insertion of carbon monoxide to form the 1,3-oxazepines S3 <96TL2713>. A convenient route to P-lactams fused to oxepines is made available by alkene metathesis. Thus reaction of 4-acetoxyazetidin-2-one with ally alcohol in the presence of zinc acetate, followed by iV-allylation of the nitrogen affords the derivative 54 which cyclises by RCM to form the oxazepinone 55 <96CC2231>. The same communication describes a similar synthesis of 1,3-dioxepines. 

The zinc acetate complex of tris(3-/-butyl-5-methylpyrazol-l-yl)borate was prepared as a structural model for carbonic anhydrase and comparison with the enzyme active site structures confirmed that the complexes are excellent structural models.239 A mononuclear zinc hydroxide complex can also be formed with the tris(pyrazolyl) borate ligand system as a structural model for carbonic anhydrase.240... 

None 100 Zinc formate 44 Zinc carbonate 42 Zinc sulfate 43 Zinc oxalate 39 Zinc chloride 8 Zinc acetate 7 Zinc benzoate 2 Zinc 3,5-di-tert-butyl-4-hydroxybenzoate 1... 

Reaction of 1 with benzaldehyde and zinc chloride gave a diastereomeric mixture (6) of R- and 5-2,3-O-benzylidene derivatives (4a and 4b). The former (4a) would be identical to the acetal described by Zinner et al. (3) as 2,4-O-benzylidene-D-ribono-1,5-lactone. This structure was further established as 4a, by chemical and physical studies of the product obtained on reaction of 1 with benzaldehyde dimethyl acetal (7). The 2,3-O-benzylidene derivative, obtained by Garegg et al. (8) on reaction of 1 with a,a-dichlorotoluene in pyridine, has the same properties as compound 4a, which would indicate the -configuration for the acetal carbon. 

Kikugawa and coworkers utilized silver carbonate in TFA and zinc acetate in nitro-methane in the synthesis of a variety of benzolactams (39, n = 1,2,3), in excellent yields, by cyclization onto aryl rings on the acyl side chain of 38 (Scheme 6) . AgBp4 was also effective but typically afforded lower yields . ... 

The A-chloro compound 176, obtained from the corresponding meth-oxyamide with f-butyl hypochlorite, was cyclized to l-methoxy-2-indolone 163 by silver carbonate in trifluoroacetic acid (87% yield) (84JA5728), or by other silver or mercury salts (87T2577), and more conveniently by anhydrous zinc acetate in 1,2-dichloroethane (91% yield) (87CL1771). The reaction proceeds through the spiro intermediate 177, followed by both possible 1,2-shifts. 

Different metallic acetates [221] have also been used in acetonitrile, which acts not only as a solvent but also as a dehydrating agent to eliminate the effect of any water produced during the reaction. In this way, the thermodynamic equilibrium could be shifted and the yield of CCs improved. By using 1,2-propene glycol as the reactant (100 mmol) and anhydrous zinc acetate (2.5 mmol) as catalyst in acetonitrile (10ml) with a C02 reaction pressure of 10 MPa, at a reaction temperature of 343 K and a reaction time of 12h, the yield of 1,2-propene carbonate was shown to be 24.2% and the conversion of 1,2-propene glycol 38.9%. 

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.

Di-0-dichloroacetyl-l-0-benzyloxycarbonyl-(4,6-0-ethylidene)-p-D-glucopyranose Palladium on carbon 4 -Demethyl-epi-podophyllotoxin Zinc acetate dihydrate Boron trifluoride etherate Trimethylsilyl trifluoromethane sulfonate Celite/basic alumina column... 

Its synthesis has been fully clarified211 . The quinol-ester 5 is the probable primary product. An intramolecular Diels Alder addition leads to 6 and dehydrogenation gives 7. Reduction with zinc/acetic affords the phenanthrol carbonic acid 8. Since these reactions as well as similar reactions using propiolic acid are reported in the literature2U), the experimental details shall not be repeated in this review. The results... 

Experiment 48. Supplies Test tubes, dilute sulphuric, nitric, and hydrochloric acids, acetic acid, glass rod, litmus paper (both colors), zinc, calcium carbonate (marble), lime water. 

The copper sulphide is filtered off and zinc acetate added to the filtrate, the zinc salt of m-arsanilic acid separating out. After filtering and washing, this is boiled with 275 c.c. of water and 160 c.c. of 10 per cent, sodium carbonate solution, the zinc carbonate filtered off, and the solution nearly neutralised with concentrated hydrochloric acid. 13-5 c.c. of glacial acetic acid are added to acidify the solution, and the amino compound is precipitated as a faintly red, crystalline powder. Yield, 65 per cent. It may be purified by dissolving in dilute ammonium hydroxide, boiling with animal charcoal, and reprecipitating with acetic acid. 

Zinc acetate is incompatible with oxidizing agents, zinc salts, alkalis and their carbonates, oxalates, phosphates, and... 

With the necessary carbons present in (49), it can be seen that the scheme of oxidation of the allylic methyl group to the aldehyde level (selenium dioxide), and a reduction of the coumarin with concommitant hydrolysis (zinc/acetic acid), afforded the hydroxy-aldehyde-acid intermediate (57), which expectedly and spontaneously cyclized to the tricyclic lactone (55) under the conditions of the reaction. 

The decomposition products identified following reaction are not necessarily the primary compounds which result directly from the rate limiting step. Particularly reactive entities may rapidly rearrange before leaving the reaction interface and secondary processes may occur on the surfaces of the residual material which often possesses catalytic properties. The volatile products identified [144] from the decomposition of nickel formate were changed when these were rapidly removed from the site of reaction. The primary products of decomposition of thorium formate were identified [17] as formaldehyde and carbon dioxide, but secondary processes occurring on the residual thoria yielded several additional compounds. The oxide product similarly catalysed interactions between the primary products of decomposition of zinc acetate [145]. During the decomposition of rare earth oxalates, carbon monoxide disproportionates extensively to carbon dioxide and carbon [81,82]. 

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