Mercury -acetate

Hydantoin itself can be detected ia small concentrations ia the presence of other NH-containing compounds by paper chromatography followed by detection with a mercury acetate—diphenylcarba2one spray reagent. A variety of analytical reactions has been developed for 5,5-disubstituted hydantoias, due to their medicinal iaterest. These reactions are best exemplified by reference to the assays used for 5,5-diphenylhydantoiQ (73—78), most of which are based on their cycHc ureide stmcture. Identity tests iaclude the foUowiag (/) the Zwikker reaction, consisting of the formation of a colored complex on treatment with cobalt(II) salts ia the presence of an amine (2) formation of colored copper complexes and (3) precipitation on addition of silver(I) species, due to formation of iasoluble salts at N. ... 

Vinyl acetate (ethenyl acetate) is produced in the vapor-phase reaction at 180—200°C of acetylene and acetic acid over a cadmium, 2inc, or mercury acetate catalyst. However, the palladium-cataly2ed reaction of ethylene and acetic acid has displaced most of the commercial acetylene-based units (see Acetylene-DERIVED chemicals Vinyl polymers). Current production is dependent on the use of low cost by-product acetylene from ethylene plants or from low cost hydrocarbon feeds. 

At the same time, the hydration of 3(5)-phenyl-5(3)-phenylethynylpyrazole 45 in sulfuric acid in the presence of mercury acetate leads to the formation of two isomeric ketones 46 (yield 44%) and 47 (yield 3%) (68LA117) (Scheme 88). 

Mercury, tris( 1,10-phenanthroline)-structure, 1, 64 Mercury acetate, S, 1066 Mercury azide, 5, 1062 Mercury bromide, S, 1059 Mercury cations Hg ... 

Di Michele A, Diodati P, Morresi A, Sassi P (2009) Mercury acetate produced by metallic mercury subjected to acoustic cavitation in a solution of acetic acid in water. Ultrason... 

Following this preparation of 39 it is subjected to oxymercuration with mercury acetate and sodium chloride to give 4,8-bischloromercury-substi-tuted 2-oxaadamantane (107). Subsequent reduction with sodium borohy-dride yields 104.134,136... 

Phenyl Carbylamine Chloride Phenyl Dibromoarsine Phenyl Dichloroarsine Phenyl Mercury Acetate Phenylaceyl Chloride Phenylarsenic Dichloride Phenylarsonous Dichloride Phenylcarbamine Phenylcarbonimidic Dichloride Phenylchloromethylketone Phenylisocyanide Dichloride Phenylisonitrile Dichloride Phenylmethylaminpropane Philippine Downy Mildew Phix... 

For this purpose, nitronate (107) containing the EtSCO- fragment was synthesized followed by selective saponification of this fragment with mercury acetate in water, which occurred with retention of the nitronate structure. 

Optically pure glyceraldehyde acetonides are widely used in the synthesis of enantiomerically pure compounds (EPC synthesis).1 2 3 4 5 Whereas D-(R)-glyceraldehyde acetonide is easily obtained from the inexpensive D-mannitol,6 7 there are only a limited number of practical syntheses of the enantiomeric L-(S)-glyceraldehyde acetonide.8 9 Difficulties arise from different sources 1) availability of the starting material diisopropylidene-L-mannitol 2) length of the synthesis 10 3) nature of the reactants used mercury acetate, mercaptans, lead tetraacetate, ozone at -78°C, 4) moderate yields.11 14... 

When subjected to mercury acetate the ynone 78 underwent a 5-endo-dig cyclization and after work-up with aqueous sodium chloride, furnished the pyrrolinones 79 and 80 in a ratio of 89/11. The mixture of pyrrolinones was reduced directly with sodium borohydride to the iST-Boc-pyrrolidinol 81 which was obtained as a single diastereoisomer. Reduction of the carbamate with lithium aluminum hydride gave (+)-preussin (2) in 37% overall yield. 

Camoensine and camoensidine were isolated from Camoensia maxima Welw. ex Benth. (183). Camoenzine is considered to be an isomer of leontidine. The mass spectra of these alkaloids were identical. Dehydrogenation of camoensine (157) with mercury acetate formed the immonium base (158), which was converted to leontidine (152) by sodium borohydride (Scheme 26). Camoensine... 

Among some metal oxygen compounds which add, palladium and thallium ion both oxidize olefins and apparently the initial step is the addition of a metal hydroxide across the olefin double bond. The intermediates have not been isolated because they go on to other products but kinetic and other evidence indicates that the addition of the hydroxide is the initial step. In the well known mercury acetate addition to olefins in alcohol solution one can isolate the /S-hydroxv or alkoxy ethylmercury derivatives. 

Mercury acetate adds to dienes just as it does to olefins, and so does palladium chloride. Here again a 7T-allyl derivative is obtained. The formation of the 7r-allyl derivative, I think, occurs after the initial addition and probably has nothing to do with the first insertion step. 

The first step in a recent synthesis2 of eleutherin (7) and isoeleutherin (8) involved OOl jugate addition of 1 to the quinone 2. The alcohol obtained by reduction of 4 Undergoes intramolecular cyclization with either mercury acetate or benzeneselenenyl bromide. The first method gives 5 and 6 in equal amounts, but phenylselenoetherifi-URtion favors formation of the cis isomer 5. In this reaction, the total yield of 5 and 6 li only 56%. 

The electrophilic addition of CF3COOH across the CF=CF moiety of diflu-oronorbornadiene has been reported [90]. Mercury acetate and trifluoroacetate also add to the fluorinated double bond rather than the non-fluorinated one [91]. 

One practical limitation is the availability, storage, and handling of reactive tri-chlorosilyl enolates. Addressing this issue, Denmark et al. developed an interesting, more practical procedure entailing in situ preparation of those reactive species. Starting from a TMS enol ether 29, in situ preparation of the trichlorosilyl enolate with tetrachlorosilane and mercury acetate, followed by subsequent asymmetric al-dol reaction, gave the aldol product (S)-25 in 89% yield and with 92% ee (Scheme 6.14). 

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