摘要:

3,5-Di-tert-butylphenol (I) was synthesized by two independent routes. It was possible to isolate a mononitro and a dinitro product. It was not possible to isolate a trinitrated product (3,5-di-tert-butylpicric acid). Bromination of I gave the dibrominated product, and chlorination of I gave a dichlorinated product and a tetrachloro product; the latter was shown to possess the dieneone structure.

ISSN:0008-4042    

DOI:10.1139/v63-238

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The reaction between di-2-thienylketoxime and the palladium (II) ion has been studied. The compounds prepared were the complexes dichlorobis(di-2-thienylketoxime-N,N′)palladium (II), biaquobis(di-2-thienylketoxime-N, N′) palladium (II) half hydrate, and polymeric forms of the chelate bis (di-2-thienylketoxime) palladium (II).

ISSN:0008-4042    

DOI:10.1139/v63-239

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

Nuclear magnetic resonance has been used to follow the decomposition of aqueous solutions of 2-methyl-Δ2-oxazoline (0.29 M) at constant pH values in the range −1 to 14. The decomposition is first order with respect to total oxazoline at any specific pH, but deviates from the simple reaction of water with the protonated species above pH 5. At neutral pH values this is shown to be partially due to a second reaction involving 2-methyl-Δ2-oxazoline and O-acetylethanolamine which yields N-2-acetoxyethyl N′-2-hydroxyethyl acetamidate. The decrease in rate constant at pH < 2 is accounted for by variation in the water concentration, which is related to the acidity function. A kinetic expression is derived for the decomposition over the whole pH range studied. The decomposition of the amidate is also discussed.

ISSN:0008-4042    

DOI:10.1139/v63-240

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

A β-D-(1 → 3)-glucanase from the Basidiomycete sp. QM 806 of Reese and Mandels has been purified and shown to hydrolyze insoluble laminarin by removing glucose residues one at a time from the non-reducing end of the polysaccharide. The enzyme will also hydrolyze simple oligosaccharides and its mode of attack on these is similar to its action on laminarin. The products produced by the action of this preparation on laminarin are consistent with recent information on the structure of this polysaccharide.

ISSN:0008-4042    

DOI:10.1139/v63-241

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The variation of rate of solvolysis of dimethyl-t-butyl sulphonium iodide as a function of solvent composition is reported for various binary mixtures of water with ethanol, N,N-dimethylformamide, N-methylformamide, dioxane, and ethylene glycol. The inadequacy of solvent bulk dielectric constant as a correlating parameter is demonstrated and solventYandZparameters are compared in this respect. The importance of the specific microscopic role of the solvent in the activation process is demonstrated and a possible important nucleophilic role for the amides suggested. Deviations in dioxane and ethylene glycol systems are discussed.

ISSN:0008-4042    

DOI:10.1139/v63-242

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

Electrochemical kinetic studies are reported on the anodic oxidation of ammonia in aqueous potassium hydroxide solutions at platinum black electrodes. A kinetic scheme of consecutive reactions is proposed; Tafel slopes are deduced for various rate-determining mechanisms and compared with the experimental behavior. The reaction pathway is correlated with that involved in the analogous catalyzed ammonia vapor decomposition. The exchange currents obtained, compared with those for hydrogen oxidation, render the system unfavorable for fuel cell applications.

ISSN:0008-4042    

DOI:10.1139/v63-243

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The polarography of alizarin alone, and alizarin in the presence of magnesium, has been studied in an ammonia–ammonium chloride electrolyte. Alizarin was found to give a reduction wave withE1/2 = −(0.14 + 0.059 pH) volts vs. S.C.E. and a polarographic diffusion coefficientD, equal to 1.20 × 10−6 cm2 sec−1over a range of pH from 7.4 to 10.0 in aqueous solution at 25 °C. The slope of the wave corresponded to a two-electron reversible process. The addition of magnesium caused a decrease in the polarographic wave for alizarin, but the combining ratio of magnesium to alizarin was a function of pH, ranging from 1.02 at pH 9.0 to 1.28 at pH 10.1. The combining ratio greater than unity could be attributed to alizarin adsorbed on a 1:1 (MgAlz) precipitate. The removal of alizarin from the solution was not quantitative in the presence of excess magnesium, and there is evidence of the formation of soluble complex species. The reaction is potentially useful for the indirect polarographic determination of magnesium.

ISSN:0008-4042    

DOI:10.1139/v63-244

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

The extensive thermodynamic variables of solids having large surface–volume ratios are usually not homogeneous functions of first degree in one another. In such systems mutual thermodynamic field potentials usually exist as between surface and interior regions. In general, mutual Helmholtz field potentials are not additive. When the lack of additivity of the Helmholtz potentials in adsorbate–adsorbent systems is independent of the quantity adsorbed, the changes in potentials of adsorbent and of adsorbate, due to adsorption, are additive and the equilibrium resembles the equilibrium of purely mechanical stresses. In such cases the adsorption potential is measured largely by the partial reversible relaxation of compressive and shear self-strain potentials of the solid adsorbent.

ISSN:0008-4042    

DOI:10.1139/v63-245

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

ϵ-N-Acetyl-L-lysinamide, α-N-glycyl-ϵ-N-acetyl-L-lysine, ϵ-N-acetyl-L-lysylglycine, α-N-glycyl-ϵ-N-acetyl-L-lysylglycine, and ϵ-N-acetylglycyl-L-lysine have been synthesized for testing as substrates for the enzyme ϵ-lysine acylase.

ISSN:0008-4042    

DOI:10.1139/v63-246

出版商:NRC Research Press    

年代:1963

数据来源: NRC

摘要:

La synthèse de dérivés hydroxylés en positions 3 et 4 de 1′ α-phtalimidoglutarimide et de ses produits d'hydrolyse est décrite.

ISSN:0008-4042    

DOI:10.1139/v63-247

出版商:NRC Research Press    

年代:1963

数据来源: NRC