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Glyoxal, p-

Sigma Tryline Whyte Chems. Ltd Trade Names Glyoxal P... [Pg.1134]

Cymel 300 Glyoxal P Melamine-fonnddehyde resin, medtylaied-, Reshiene 7111 Resimene 7112 Reshiene AQ-7550 Resimene BM-5901 Resimene U-933 SR 444 SR 494 SR 9041 1,1,1-Trimethylolpropane... [Pg.1485]

Tryline http //www.tryiine.com, Whyte Chems. Ltd http //WWW. whytechemicais. co. uk Trade Name Synonyms Freechem 40DL [Noveon http //WWW. noveoninc. com, http //WWW. carbopoi. com, http //www.noveoncoatings.com], Glyoxal P [BASF AG http //www.basf.de], Protectol GL 40 [BASF AG http //www.basf.de]... [Pg.1943]

Glyoxal Glyoxal P Protectol GL 203-475-4 Vinyl methyl ether 203-480-1... [Pg.6730]

The reaction of diketosulfides with 1,2-dicarbonyl compounds other than glyoxal is often not efficient for the direct preparation of thiophenes. For example, the reaction of diketothiophene 24 and benzil or biacetyl reportedly gave only glycols as products. The elimination of water from the P-hydroxy ketones was not as efficient as in the case of the glyoxal series. Fortunately, the mixture of diastereomers of compounds 25 and 26 could be converted to their corresponding thiophenes by an additional dehydration step with thionyl chloride and pyridine. [Pg.204]

Hammel KE, MD Mozuch, KA Jensen, PJ Kersten (1994) HjOj recycling during oxidation of the arylglycerol P-aryl ether lignin structure by lignin peroxidase and glyoxal oxidase. Biochemistry 33 13349-13354. [Pg.139]

A number of useful reviews have appeared in the course of the last few years, and a number of chemicals, such as vitamin C, p-tetralone, hexafluoropropylene oxide, piperidine, glyoxalic acid, pinacol, p-hydroxypropiophenone, sebacic acid, p-anisaldehyde, maltol/ethyl maltol. Rose oxide, linalool, perfluorooctanoic acid, hydroquinone, etc., that are commercially made (or can be made) electrochemically have been catalogued. [Pg.167]

The slow, rate-limiting step is almost certainly the migration of phenyl that occurs in the initial eOH adduct (135). This is essentially the analogue for 1,2-diketones of the intramolecular Cannizzaro reaction on the 1,2-dialdehyde glyoxal, OHCCHO (p. 217). In the latter... [Pg.232]

A powerfully reducing and reactive solid (m.p., 15°C) of high vapour pressure (b.p., 50°C). Mixtures with air may explode, and contact with water causes violent polymerisation [1], More usually encountered polymeric or as a hydrate. Like formaldehyde, pure glyoxal may polymerise exothermally and ignite in storage [2],... [Pg.276]

Condensation of glyoxalic acid, nitroalkanes, and amines provides a simple method for P-nitro-a-amino acids (Eq. 4.116).154... [Pg.107]

Conversion of ketone 80 to the enol silane followed by addition of lithium aluminum hydride to the reaction mixture directly provides the allylic alcohol 81 [70]. Treatment of crude allylic alcohol 81 with tert-butyldimethylsilyl chloride followed by N-b ro m o s u cc i n i m i de furnishes the a-bromoketone 82 in 84 % yield over the two-step sequence from a.p-unsaturated ester 80. Finally, a one-pot Komblum oxidation [71] of a-bromoketone 82 is achieved by way of the nitrate ester to deliver the glyoxal 71. It is worth noting that the sequence to glyoxal 71 requires only a single chromatographic purification at the second to last step (Scheme 5.10). [Pg.122]

APG, p-azidophcnyl glyoxal, is a heterobifunctional crosslinker containing an arginine-specific diketone group on one end and a photosensitive phenyl azide group on the other end (Thermo... [Pg.334]

Politz, S.M., Noller, H.F., and McWhirter, P.D. (1981) Ribonucleic acid-protein cross-linking in Escherichia coli ribosomes (4-azidophenyl) glyoxal, a novel heterobifunctional reagent. Biochemistry 20, 372-378. [Pg.1104]

The reaction of these aldehydes, derived from periodate oxidation, with carbonyl reagents has also been investigated. Studies 147 148 were made on oxidized laminarin, a (1 —> 3)-linked polysaccharide, in which only the terminal residues had been oxidized. The addition of phenylhydrazine acetate detached the remainder of the terminal residue as glyoxal phenyl-osazone. When the aldehydic compounds derived from the periodate oxidation of raffinose and trehalose818a were reacted with p-nitrophenylhydrazine, the authors were surprised to find that one molecule of oxidized raffinose, containing six aldehydic functions, reacts with only three molecules of the reagent, and that the four aldehydic functions of the oxidized trehalose molecule react with only two. The reactions of periodate-oxidized carbo-... [Pg.26]

The preparative importance of the acyloins depends on the fact that they are intermediate products, from which many 1 2-diketones can be obtained. The simplest aromatic member of this group is benzil (anisil and furil are analogous) like its aliphatic prototype diacetyl CH3.CO.CO.CH3 (and like anhydrous glyoxal) it is yellow in colour. Diacetyl is obtained from methyl-ethyl ketone via the monoxime of the former compound (von Pechmann). It is remarkable that diacetyl condenses to p-xyloquinone. (Formulate). [Pg.224]

Irradiation of ///-xylene isomerizes to p-xylene (Calvert and Pitts, 1966). Glyoxal, methylglyoxal, and biacetyl were produced from the photooxidation of ///-xylene by OH radicals in air at 25 °C (Tuazon et al, 1986a). The photooxidation of ///-xylene in the presence of nitrogen oxides (NO and NO2) yielded small amounts of formaldehyde and a trace of acetaldehyde (Altshuller et al, 1970). ///-Tolualdehyde and nitric acid also were identified as photooxidation products of ///-xylene with nitrogen oxides (Altshuller, 1983). The rate constant for the reaction of ///-xylene and OH radicals at room temperature was 2.36 x 10 " cmVmolecule-sec (Hansen et al., 1975). A rate constant of 1.41 x 10" L/molecule-sec was reported for the reaction of ///-xylene with OH radicals in the gas phase (Darnall et ah, 1976). Similarly, a room temperature rate constant of 2.35 x 10"" cmVmolecule-sec was reported for the vapor-phase reaction of ///-xylene with OH radicals (Atkinson, 1985). At 25 °C, a rate constant of 2.22 x 10"" cm /molecule-sec was reported for the same reaction (Ohta and Ohyama, 1985). Phousongphouang and Arey (2002)... [Pg.1157]

Terpenoid DBPs were investigated by Joll et al. [124] and Qi et al. [125]. The main ozonation product of 2-methylisobomeol was camphor, which was further oxidized to formaldehyde, acetaldehyde, propanal, buntanal, glyoxal, and methyl glyoxal [125]. Chlorination of p-carotene, retinol, p-ionone, and geranyl acetate resulted in the formation of THMs [124]. [Pg.117]

Although phenol itself is used in the largest volume, various substituted phenols such as cresol (o-, m-, p-), p-butylphenol, resorcinol, and bisphenol A are used for specialty applications. Some use is also made of aldehydes other than formaldehyde—acetaldehyde, glyoxal, 2-furaldehyde. [Pg.121]

R = glyoxalate, oxazole, thiazole, a,P-unsaturated, electron-poor aromatic... [Pg.113]


See other pages where Glyoxal, p- is mentioned: [Pg.30]    [Pg.381]    [Pg.1755]    [Pg.6086]    [Pg.132]    [Pg.30]    [Pg.381]    [Pg.1755]    [Pg.6086]    [Pg.132]    [Pg.193]    [Pg.261]    [Pg.78]    [Pg.211]    [Pg.1243]    [Pg.1523]    [Pg.866]    [Pg.172]    [Pg.120]    [Pg.333]    [Pg.334]    [Pg.80]    [Pg.253]    [Pg.723]    [Pg.727]    [Pg.143]    [Pg.111]    [Pg.95]    [Pg.1530]    [Pg.125]    [Pg.23]    [Pg.401]    [Pg.421]   
See also in sourсe #XX -- [ Pg.341 ]




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