Silver glycinate

In a fundamental study in 1950, Wieland and his associates [6] refer to a suggestion made in 1882 by K. Kraut and F. Hartmann, namely that in the formation of the first peptide derivative, benzoylglycylglycine in the hands of Curtius (cf p, 25) a mixed anhydride intermediate should be assumed. The same two authors proposed as early as 1865 a mixed anhydride intermediate in the preparation of aceturic acid (iV-actylglycine) from silver glycinate and acetyl chloride ... 

Figure 5. Analytical isoelectric focusing. Ultrathin layers (0.4 nun) of polyacrylamide with ampholytes pH 2-11 were used. Samples of 10 pg of protein in 10 pi of 1 % glycine were applied. A.- Silver staining. B.- Stain for activity on overlays containing pectin in tris/HCl buffer at pH 8.0 with CaClj M.- Broad pi Calibration Kit protein (Pharmacia), samples of 5 pg of protein were applied. 1.-Ammonium sulphate precipitated proteins from cultures on pectin. 2.- Fractions with PNL activity eluted from the Superdex 75HR1030 column. 3.- Purified PNL.

Palladium-on-charcoal in reduction of (-butyl azidoacetate to glycine (-butyl ester, 46, 47 Pelargonyl fluoride, 46, 6 3,3-Pentamethylenediazirine, 46, 83 oxidation to 3,3-dimethyIazarine by silver oxide, 46, 83 Peroxyvanadic acid, 46, 27 Phenanthrene, 9-phenyi, 46, 91 Phenol, 46, 90... 

Dimer with Ag—Ag bond (2.88 A) similar to metallic Ag. Silver atoms bridge centrosymmetric pairs of carboxy-groups forming dimers of glycine. 

Another approach employing chiral acyclic azomethine ylides was published in two recent papers by Alcaide et al. (85,86). The azomethine ylide-silver complex (51) was formed in situ by reaction of the formyl-substituted chiral azetidinone (50) with glycine (or alanine) in the presence of AgOTf and a base (Scheme 12.18). Azomethine ylides formed in this manner were subjected to reaction with various electron-deficient alkenes. One example of this is the reaction with nitrostyrene, as illustrated in Scheme 12.18 (86). The reaction is proposed to proceed via a two step tandem Michael-Henry process in which the products 52a and 52b are isolated in a... 

The structure of the ferroelectric, tri-glycine fluoberyllate [8, 9], has been determined, and participation of H-bonds in the polarization mechanism at the Curie point is described. Glycine silver nitrate is also ferroelectric [10], and a polarization mechanism, also involving H-bonds, is suggested. It is evident, from dielectric and structural... 

The crystal structures of Ag(Gly)69 and Ag(HGly)NOs405 have been determined. For the latter compound, the silver ions bridged centrosymmetrically related carboxyl groups to form dimers of glycine. The actual composition was best represented as (NH3CH2C02 Ag+)2(NOi )2. Below —55 °C the compound was found to be ferroelectric. It was the first crystal containing either silver or the nitrate ion in which ferroelectridty was observed.406... 

Halpern and his associates have recently extended their studies of the activation of hydrogen by aqueous solutions of cupric, mercuric, mercurous, and silver salts. The catalytic activities of a series of cupric complexes decrease in the following order butyrate, propionate > acetate > sulfate > chloride > water (perchlorate solution) > glycine,... 

Electrophilic substitutions. The key step in a synthesis of the ring system (6) of the antibiotic bicyclomycin (7) is the reaction of the silver trillatc complex of the glycine anhydride derivative 1 with 2 to give the. vwi-lactonc 3 as the major product, with retention... 

The method previously described for the preparation of potassium dinitrodiglycinatocobaltate(III) uses the action of potassium glycinate on potassium hexanitrocobaltate-(III) The corresponding silver salt is prepared by double decomposition of the potassium salt with silver nitrate. 

Figure 3. SDS-PAGE, on a 0.8% agarose, 3.5% acrylamide gel run in tris-glycine buffer, of samples after crosslinking with glutaraldehyde. Bands were stained with silver. Lane 1, M2S, mtase lane 2, MjS, mtase + R subunit lane 3, M,Si + M subunit lane 4, MiS, visible at very bottom of gel lane 5, M,S, + R subunit lane 6, M subunit + R subunit lane 7, M subunit dimer with the predominant M subunit monomer having migrated off the base of the gel lane 8, R subunit in a monomeric form.

Glycine (Coll. Vol. i, 292) Glycine esters are hydrols ed with an organic acid, such as acetic add, and the mixture is evaporated to dryness. Ger. pat. 594,273 [C. A. 28, 3417 (1934)1 Glycine ethyl ester hydrochloride is converted to the sulfate by silver sulfate, saponified by barium hydroxide, and excess of the latter is removed byconversion to barium sulfate. Ger. pat. 397,305 [C. A. 28, 3078 (1934)]. 

SERS data for glycine adsorbed on silver colloidal particles include a band at 238 cm-1 due to vAg-N.403 vAgN modes were assigned from the IR spectra of [bis(l,2,4-triazol-l-yl)methane]silver(I) complexes AgX tz2(CH2) ER3 MeCN, where X = N03, R = Ph, E = P, As, Sb, and related systems.404... 

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