Zinc diacetate

Chemical Designations - Synonyms Acetic acid, zinc salt Dicarbomethoxyzine Zinc acetate dehydrate Zinc diacetate Chemical Formula Zn(CWtf) or Zn(CWtf) tfO. 

Ziegler-Natta catalysis, 431, 449 Zinc diacetate catalysts, 71 Zirconium alkoxides, 68... 

ZINC ACETATE Acetic add, zinc salt, Dicarboinethoxy-zinc, Zinc diacetate NL, II 1 1 0... 

Acetic acid, zinc salt dicarbomethoxy zinc zinc (II) acetate zinc diacetate zinc ethanoate. 

Zinc Acetate Acetic Acid Zinc Salt Dicarbo- methoXyzine Zinc Acetate Dehydrate Zinc Diacetate... 

ZINC CYANIDE (557-21-1) Zn(CN)j Noncombustible solid. May tend to be an unstable explosive. Reacts with acids, acid fumes, acid salts, or elevated temperatures releases flammable and poisonous hydrogen cyanide gas. Can react violently with magnesium (incandescence), chlorates, nitrates, perchlorates. Incompatible with nitrites, chlorates. Mixtures of metal cyanides with metal chlorates, nitrates, nitrites, or perchlorates may cause violent explosions. Incompatible with strong oxidizers, bromine, chlorine, fluorine, mercurous chloride, nitric acid. Violent reaction with sodium nitrite. Forms sensitive explosive mixtures with potassium chlorate. ZINC DIACETATE (557-34-6 5970-45-6, dihydrate) Zn(C2H302)2 Noncombustible... 

ZINC DIACETATE (557-34-6) Incompatible with strong acids, strong bases. Moisture may cause hydrolysis/decomposition. 

CAS 557-34-6 (anhyd.) 5970-45-6 (dihydrate) EINECS/ELINCS 209-170-2 UN 9153 (DOT UN anhyd. )E650 Synonyms Acetic acid, zinc salt Dicarbomethoxy zinc Zinc diacetate Classification Aliphatic organic compd. 

Zinc diacetate. See Zinc acetate Zinc diacrylate CAS 14643-87-9... 

Further reaction occurs with another BH molecule, and proceeds through the formation of hydrogen bonds between BH and either —O or —N— of one of the two resonance forms (it is not known which one). In a catalyzed reaction the catalyst can also take the place of the first BH molecule. Sterically unhindered amines such as triethylene diamine can thus catalyze the addition through the effect of the electron lone pairs on the nitrogen atom, which, because of the triethylene diamine structure, are particularly accessible. Metal salts such as di-n-butyl zinc diacetate are also very active. 

Ionic crosslinking of polypropylene can also contribute to better properties. PP with grafted maleic anhydride can be crosslinked by addition of zinc diacetate or sodium acetate. It is surprising that besides bivalent zinc monovalent sodium can also act as a crosslinking agent... 

Vinylsilicon Trichloride Vinyltrichlorosilane Zinc Diacetate Zinc Aceute... 

Acetic anhydride adds to acetaldehyde in the presence of dilute acid to form ethyUdene diacetate [542-10-9], boron fluoride also catalyzes the reaction (78). Ethyfldene diacetate decomposes to the anhydride and aldehyde at temperatures of 220—268°C and initial pressures of 14.6—21.3 kPa (110—160 mm Hg) (79), or upon heating to 150°C in the presence of a zinc chloride catalyst (80). Acetone (qv) [67-64-1] has been prepared in 90% yield by heating an aqueous solution of acetaldehyde to 410°C in the presence of a catalyst (81). Active methylene groups condense acetaldehyde. The reaction of isobutfyene/715-11-7] and aqueous solutions of acetaldehyde in the presence of 1—2% sulfuric acid yields alkyl-y -dioxanes 2,4,4,6-tetramethyl-y -dioxane [5182-37-6] is produced in yields up to 90% (82). 

The synthesis of 2,4-dihydroxyacetophenone [89-84-9] (21) by acylation reactions of resorcinol has been extensively studied. The reaction is performed using acetic anhydride (104), acetyl chloride (105), or acetic acid (106). The esterification of resorcinol by acetic anhydride followed by the isomerization of the diacetate intermediate has also been described in the presence of zinc chloride (107). Alkylation of resorcinol can be carried out using ethers (108), olefins (109), or alcohols (110). The catalysts which are generally used include sulfuric acid, phosphoric and polyphosphoric acids, acidic resins, or aluminum and iron derivatives. 2-Chlororesorcinol [6201-65-1] (22) is obtained by a sulfonation—chloration—desulfonation technique (111). 1,2,4-Trihydroxybenzene [533-73-3] (23) is obtained by hydroxylation of resorcinol using hydrogen peroxide (112) or peracids (113). 

The pieces of cloth are then plied up and moulded at about 170°C for 30-60 minutes. Whilst flat sheets are moulded in a press at about lOOOlbf/in (7 MPa) pressure, complex shapes may be moulded by rubber bag or similar techniques at much lower pressures ( 15 Ibf/in ) (0.1 MPa) if the correct choice of resin is made. A number of curing catalysts have been used, including triethanolamine, zinc octoate and dibutyl tin diacetate. The laminates are then given a further prolonged curing period in order to develop the most desirable properties. 

Benzodioxocin (14) can also be prepared starting from the dihydro derivative 17.14 Whereas an attempted bromination-didehydrobromination procedure was not successful, the required dehydrogenation was achieved by bromination with A -bromosuccinimide and treatment with triethylamine, by double bromination with iV-bromosuccinimide and debromination with zinc, or by pyrolysis of a diacetate derived from 17 by bishydroxylation and acetylation.14... 

C NMR studies suggest that 1,4,7,10-tetra-azacyclododecane-l,7-diacetic acid binds to zinc in a cis octahedral geometry—the two carboxylate oxygens are cis and the remaining four donors from the cyclen macrocycle. The formation constant was determined for the complex.733... 

The final method for constructing epidithiodiketopiperazine motifs relied on the nucleophilic thiolation of /V-acyliminium ions. Access to alpha-oxidized diketopi-perazine structures was central to this approach, and key developments were made in this regard. Schmidt first demonstrated the feasibility of this ionization approach in 1973 by conversion of proline anhydride to its diacetate using Pb(OAc)4 [42], Hydrolysis of the acetates, ionization of the hemiaminals with zinc chloride in the presence of hydrogen sulfide, and oxidation with iodine provided the epidisulfide of interest. In 1975, Matsunari reported access to alpha-methoxy diketopiperazines,... 

The applicability of the method is demonstrated using Zn-enriched zinc formate dihydrate Zn(00CH)2 2H20 and zinc diimidazole diacetate Zn(OOCCH3)2(C3H4N2)2 . These complexes are representatives of Zn + in an all-oxygen six-coordination sphere and in a 2-0, 2-N four-coordination sphere, respectively. 

Resacetophenone has been prepared by heating resorcinol with zinc chloride and acetic acid,1,2 with zinc chloride and acetic anhydride,2 and with zinc chloride and acetyl chloride.3 It has also been prepared by the action of zinc chloride on resorcinol diacetate,2 by heating 4-methylumbelliferone with potassium hydroxide,4 by heating resacetophenone carbonic acid,5 and by the action of acetyl chloride on resorcinol.6... 

Suspend 0.5 g of the quinone in 2.5 ml of pure acetic anhydride, and add 0.5 g of zinc powder and 0.1 g of powdered, anhydrous sodium acetate. Warm the mixture gently until the colour of the quinone has largely disappeared and then boil for 1 minute. Add 2 ml of glacial acetic acid and boil again to dissolve the product and part of the precipitated zinc acetate. Decant the hot solution from the zinc acetate and zinc, and wash the residue with 3-4 ml of hot glacial acetic acid. Combine the solutions, heat to boiling, carefully add sufficient water to hydrolyse the acetic anhydride and to produce a turbidity. Cool the mixture in ice, filter off the diacetate of the hydroquinone and recrystallise it from dilute ethanol or from light petroleum. 

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