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F Glyoxal

F. Glyoxal, (CHO)2.—There have been a number of calculations on the ground state of this molecule, and very recently a more detailed study of several excited states. [Pg.36]

Glycidyl phenyl ether, see 3-Phenoxy-1,2-epoxypropane, 3144 f Glyoxal, see Ethanedial, 0719 Gold, 0110... [Pg.2095]

Acetals of A. A -dimethyl hydrazones 4, derived from glyoxal (1) and various enantiomerically pure diols (c.g., 3a-f)24, are readily prepared by transacetalization of 2. Addition of methyl-or butyllithium to 4 provides the corresponding hydrazines in good yield (70-88%) and moderate to excellent diastereoselectivity (see Table 3)4,5. [Pg.711]

Heats of formations (A//f) of the possible two trans- and four cA-fused stereoisomers of the 9-hydroxyperhydropyr-imido[2,1 / 1,4]oxazine 287 derived from 3-(2-hydroxyethyl)-l,3-propanediamine and glyoxal were calculated by the AMI program. Experimentally, 287 was obtained as 3 1 cis—trans mixture the isomers were not separated < 1996H(43)1991 >. [Pg.298]

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]

Type (ii) cyclizations are more common. Thus, acid derivatives of pyrrolo[l,2-f>]-[l,2,5]benzothiadiazepine 5,5-dioxide 346 and 347 have been prepared from amino sulfonyl pyrrole 345 with acetal (2006JMC5840) or the semiacetal (1994JHC867) of ethyl glyoxalate or ethyl 2,2-diethoxy propionate (1996FES425) in the presence of PTSA catalyst in boiling absolute ethanol by a Pictet-Spengler type of reaction (Scheme 73). [Pg.52]

Schweitzer, F., L. Magi, P. Mirabel, and C. George, Uptake Rate Measurements of Methanesulfonic Acid and Glyoxal by Aqueous Droplets, J. Phys. Chem. A, 102, 593-600 (1998). [Pg.178]

Chung, F.-L. Hecht, S.S. (1985) Formation of the cyclic CN -glyoxal-deoxyguanosine adduct upon reaction of A-nitroso-2-hydroxymorpholine with deoxyguanosine. Carcinogenesis, 6, 1671-1673... [Pg.431]

WHO (1993) Guidelines for Drinking-Water Quality, 2nd Ed., Vol. 1, Recommendations, Geneva Zimmermann, F.K. Mohr, A. (1992) Formaldehyde, glyoxal, urethane, methyl carbamate, 2.3-butanedione, 2,3-hexanedione, ethyl acrylate, dibromoacetonitrile and 2-hydroxypropionitrile... [Pg.1457]

U. Schwarzenbolz, T. Henle, and H. Klostermeyer, Studies on the reaction of glyoxal with protein-bound arginine, in F, 1998, 443. [Pg.192]

Glyoxalate esters of phenylmenthois (83 equation 20) have been extensively used as chiral auxiliaries for a number of different reactions. Selective Grignard addition fi-om the f nt face of the molecule... [Pg.65]

The prototype reaction is the conversion of glyoxal into glycolic acid (equation 2), and here the benzilic acid rearrangement mechanism coincides with that for an intramolecular Cannizzaro reaction. The reaction is observed with other purely aliphatic a-diketones such as f-butyl 2,3-dioxobutyrate and cyclohexane-1,2-dione (equations 3 and 4), but the scope is limited in the aliphatic series by competing (c.g. aldol) reactions. Suitably constructed heterocyclic systems also rearrange, and the conversion of alloxan (3) into alloxanic acid (4) was among the first of the benzilic acid rearrangements to be discovered (equation 5). ... [Pg.822]

Carvalho de, R. A. and Grosso, C. R. F. (2004). Characterization of gelatin based films modified with transglutaminase, glyoxal and formaldehyde. Food Hydrocolloids 18,717-726. [Pg.125]


See other pages where F Glyoxal is mentioned: [Pg.15]    [Pg.144]    [Pg.198]    [Pg.913]    [Pg.997]    [Pg.15]    [Pg.144]    [Pg.198]    [Pg.913]    [Pg.997]    [Pg.257]    [Pg.258]    [Pg.51]    [Pg.185]    [Pg.159]    [Pg.684]    [Pg.245]    [Pg.374]    [Pg.1054]    [Pg.258]    [Pg.192]    [Pg.222]    [Pg.186]    [Pg.181]    [Pg.65]    [Pg.289]    [Pg.299]    [Pg.279]    [Pg.707]    [Pg.65]    [Pg.65]    [Pg.940]    [Pg.86]    [Pg.86]    [Pg.135]   


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