Zinc acetate bromide

Rubidium metal alloys with the other alkali metals, the alkaline-earth metals, antimony, bismuth, gold, and mercury. Rubidium forms double halide salts with antimony, bismuth, cadmium, cobalt, copper, iron, lead, manganese, mercury, nickel, thorium, and zinc. These complexes are generally water insoluble and not hygroscopic. The soluble rubidium compounds are acetate, bromide, carbonate, chloride, chromate, fluoride, formate, hydroxide, iodide,... 

In accord with the reactions undergone by, for example, tetra-0-acetyl-a-D-glucopyranosyl bromide (23) with bases, and with zinc - acetic acid, which give tetra-0-acetyl-1,5-anhydro-D-arabino-hex-1 -enitol ( tetra-0-acetyl-2-hydroxy-D-glucal ) (158) and tri-O-acetyl-1,5-anhydro-2-deoxy-D-ara >/ o-hex-I-enitol ( tri-O-acetyl-D-glucal ) (159), respectively (see Scheme 24),... 

Because 6-deoxyhex-5-enopyranose derivatives can be readily converted into 2-deoxyinososes,91 5-bromides (for example, 164) give useful access to such carbocyclic compounds.92 In this way, octa-0-acetyl-/ -maltose was converted by treatment with zinc-acetic acid into the 5-ene by way of the corresponding 5-bromide 30 and thence into the pseudo-disaccharide compound (169) which is related to components of members of the aminoglycoside antibiotic series.36... 

Mixed bromides 33, 34 formed from either 1 -0-acetyl-2,3,5,6-tetra-O-benzoyl-/ -D-glucose or -galactose, also undergo preferential endo-elimina-tion on treatment with DBU, and give the alkene (170). As in the pyranose series, exo-elimination is favored with use of zinc - acetic acid, and geometric isomers (171) are the main products and are formed93 together with the 3-deoxy-3-ene (172). 

An entirely different approach to pyranoid 4-enes depends on eliminations from 5-bromo compounds obtained from pyranoid hexuronic acid derivatives by photobromination. Treated with zinc-acetic acid, the bromide 249 gives the glycal -like 250 (62%), while the 4-acetoxy compound 251 is formed when DBU is used to promote elimination. Similarly, base treatment of penta-0-acetyl-5-bromo-/J-D-glucose with DBU causes the analogous loss of hydrogen bromide and formation of the 4-acetoxy-4-ene, but use of zinc-acetic acid affords mainly the 5-exo-methylene alkene by the alternative available elimination process.237... 

ZnC4H10O6 zinc acetate dihydrate 5970-45-6 25.00 1.7350 1 5117 ZrBr4 zirconium bromide 13777-25-8 25.00 3.9800 1... 

Non-terpenoid Alkaloids.—De-A-methylation of lysergic acid and derivatives can be achieved using a variant14 of the classical von Braun procedure which involves successive treatments with cyanogen bromide and zinc-acetic acid (or hydrogen-Raney nickel). 

Stearalkonium chloride TEA-sorbate Tea tree (Melaleuca alternifolia) extract Tetrabutyl ammonium bromide Thiabendazole 2,2 -Thiobis (4-chlorophenol) 2,2 -Thiobis (4,6-dichlorophenol) Tormentil (Potentilla erecta) extract Jriacetin Undecylenamide DEA Undecylenamide MEA Undecylenamidopropyl betaine Undecylenamidopropyl trimonium methosulfate Undecyleneth-6 Willow (Salix alba) bark extract Zinc acetate Zinc borate Zinc phenolsulfonate Zinc sulfate Zinc undecylenate... 

Acetyl bromide - Zinc/Acetic anhydride Reductive cleavage of ethers [59, 60]... 

A procedure by using enamino ester and alkynone as the substrates was developed as well [2]. 2,3,4,6-Tetrasubstituted pyridines were prepared in a single step. Various acids, such as acetic acid, Amberlyst 15 ion exchange resin, zinc(II) bromide or ytterbium(III) triflate, can be applied as promoter for the cycUzation step of the Michael addition adduct. 4-(3-Oxoalkyl)isoxazoles found could be applied as starting material for pyridine synthesis as well [3],... 

Chromatographic analysis of the vitamin Bg complex, including sample preparation and pre-TLC extraction have been reviewed (14). Separation of pyridoxine from other water-soluble vitamins in pharmaceutical preparations may be facilitated by impregnating silica gel plates with zinc acetate to provide a self-indicating system after separation (7). Impregnation of plates with hexadecyltrimethyl-ammonium bromide has been used to improve the TLC analysis of vitamin in foods (9). Overpressure layer chromatography was found to provide better separation and resolution of B( from other compounds than HPTLC (11). 

Ammoniiun chloride, lithium hydroxide, sodium molybdate, sodium bromide, polyphosphates/orthophosphates/phosphoric acid, zinc acetate, and ethylene/propylene glycol. 

Phthalic anhydride Polyadipic acid anhydride Coal tar pilch and diethylene triamine Tall oil plus cobalt naphthenate Organosiloxanes containing Si-OH groups, plus catalysts [ferric naphthenate, ferric bromide, zinc acetate, zinc benzoate, zinc stearate]... 

An improvement in the synthesis of the tri-O-acetyl-D-galactal was noted when the reaction of tetra-O-acetyl-a-D-galactopyranosyl bromide with zinc-acetic acid was carried out at -1S°C at which temperature less hydrolysis and acetolysis of the carbon-bromine bond occurred. Tri-O-acetyl-D-glucal may be obtained from 3,4,6-tri-0-acetyl-2-bromo-2-deo -D-glucosyl phenylthionocarbonate. Racemic (4) has been resolved by the... 

M zinc/acetic acid N ammonia/ lyridine O hydrogen bromide/acetic acid... 

The total synthesis of alkaloid (+)-lycoricidine reported by Yadav et al. represents a further application of the sequence domino reductive fragmentation/allylation followed by ring-closing metathesis in the synthesis of bioactive natural products [42], Thus, reaction of co-iodoglycoside 29 with zinc/allyl bromide in THF/HjO afforded diene 30 (87%, dr 85 15). Ring-closing metathesis of diene 30 followed by acetylation furnished cyclohexene 31. Treatment of the acetate 31 with PhINTs in the presence of Cu(acac)2, followed by sodium naphthalenide, afforded the aziridine 32 (67%), from which (-i-)-lycoricidine (33) can be easily obtained (Scheme 3.11). 

Allylic acetates can be added to ketones employing an iron(II) catalyst, zinc(II) bromide as additive, and manganese metal as reductant (Scheme 4—320). The procedure provides homoallylic alcohols in good yields. Introducing either 1- or 3-substituted allylic acetates leads to the formation of the linear homoallylic product. This implies the intermediacy of an allyliron complex. 

Benzopinacol has been prepared by the action of phenylmag-nesium bromide on benzil 1 or methyl benzilate. Usually it has been obtained by reduction of benzophenone, the reducing agents being zinc and sulfuric acid or acetic acid, aluminum amalgam, and magnesium and magnesium iodide. The present... 

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