摘要:

Ca41, a nuclide decaying by orbital electron capture, has been again identified and its half-life measured. The activity of the source, a highly irradiated sample of calcium carbonate, had decayed for 10 years so that competing activities were non-existent. The measurement was made with a gas-flow proportional counter with well-determined characteristics. A value of (7.5 ± 1.1) × 104years has been obtained.

ISSN:0008-4042    

DOI:10.1139/v62-127

出版商:NRC Research Press    

年代:1962

数据来源: NRC

摘要:

Equivalent conductances, densities, and viscosities of aqueous solutions of sodium octanoate have been determined at 25° and 35 °C, at concentrations ranging from 0.0002 M to 2.8 M. The limiting equivalent conductances of the octanoate ion have been determined as 23.08 mhos and 29.09 mhos, at 25° and 35 °C respectively.Comparison has been made of our experimental conductances with those calculated, using the equations of Robinson–Stokes, of Falkenhagen–Leist, and of Fuoss.No evidence has been found of micelle formation in solutions of sodium octanoate.

ISSN:0008-4042    

DOI:10.1139/v62-128

出版商:NRC Research Press    

年代:1962

数据来源: NRC

摘要:

The homogeneous thermal decomposition of Ni(CO)4between 35 °C and 80 °C and over a pressure range of 15 mm to 80 mm of Hg has been distinguished from the heterogeneous reaction occurring on the freshly deposited nickel surface. The activation energy of the homogeneous reaction was found to be 19.1 kcal mole−1and of the heterogeneous reaction, 14.3 kcal mole−1. The activated complex for the heterogeneous reaction is Ni(CO)4, which is physically adsorbed. The heat of adsorption of Ni(CO)4is 7.4 kcal mole−1. Carbon monoxide is also adsorbed upon the same sites with a heat of adsorption of 13.3 kcal mole−1, which is much greater than its latent heat of vaporization. The homogeneous reaction may be inhibited by a surface of sodium chloride. Nickel deposited upon rutile behaves in the same way catalytically as nickel deposited upon glass wool.

ISSN:0008-4042    

DOI:10.1139/v62-129

出版商:NRC Research Press    

年代:1962

数据来源: NRC

摘要:

Azotobacterindicumwas grown on media which containedD-glucose-1-C14,D-glucose-2-C14,D-glucose-6-C14,D-mannose-1-C14, orD-galactose-1-C14. The radioactive polysaccharides produced were hydrolyzed and the specific activities of the isolatedD-glucose andL-rhamnose were measured. The sugars were degraded and the distribution of activity in the individual carbon atoms was determined.The results suggest that someL-rhamnose is formed fromD-glucose by a pathway which involves the breakdown of the glucose carbon skeleton.

ISSN:0008-4042    

DOI:10.1139/v62-130

出版商:NRC Research Press    

年代:1962

数据来源: NRC

摘要:

δ-Carboline, together with β-carboline, has been synthesized in reasonably good yield by the Fischer cyclization of cyclohexanone 3-pyridylhydrazone followed by dehydrogenation of the separated tetrahydro derivatives. The isomer ratios of products formed in this and similar reactions are discussed. Nitration of δ-carboline gives a mixture of the 6- and 8-nitro derivatives, the latter being the predominant product. The magnitude of the dipole moment of δ-carboline is appreciably higher than that predicted from molecular orbital calculations (15).

ISSN:0008-4042    

DOI:10.1139/v62-131

出版商:NRC Research Press    

年代:1962

数据来源: NRC

摘要:

The proton resonance spectra ofcis-, muco-, and allo-inositol hexaacetates as a function of temperature yield enthalpies of activation and Arrhenius factors for some of the skeletal oscillations of the six-membered ring.

ISSN:0008-4042    

DOI:10.1139/v62-132

出版商:NRC Research Press    

年代:1962

数据来源: NRC

摘要:

The high-resolution proton magnetic resonance spectra of a mixture of the cis and trans isomers of chrysanthemum monocarboxylic acid ethyl ester have been studied. Thecis-chrysanthemumic andtrans-chrysanthemumic acids spectra were obtained to facilitate the interpretation of the complex spectra of the ester. The percentage of the trans isomer in the chrysanthemum ester was measured to be 62.0 ± 1.1%. The cyclopropane proton spin coupling constants were found to beJcis = 8.7 c.p.s. andJtrans = 5.4 c.p.s., in reasonable agreement with Karplus' calculations of the dependence of coupling constants on the dihedral angle.

ISSN:0008-4042    

DOI:10.1139/v62-133

出版商:NRC Research Press    

年代:1962

数据来源: NRC

摘要:

The action of base on trisubstituted N-alkyl isoxazolium salts, first described by Kohler and co-workers (1, 2), has been reinvestigated. On the basis of photochemical and spectroscopic studies it is concluded that the reaction of the N-methyl triphenylisoxazolium ion (Ia) with aqueous sodium hydroxide leads to 4,5,6-triphenyl-2H-1,3-oxazine (III), a derivative of a heterocycle previously known only in benz-fused systems.

ISSN:0008-4042    

DOI:10.1139/v62-134

出版商:NRC Research Press    

年代:1962

数据来源: NRC

摘要:

The specific conductance of pure molten lithium chlorate between 130 and 145 °C was determined and an activation energy of conductance deduced. Additions of substances having various dielectric constants were made to molten lithium chlorate and the conductances determined. These additions were: (a) water, 0–6% by weight; (b) nitrobenzene, 0–0.4% by weight; (c) methyl alcohol, 0–1.25% by weight. The results are discussed.

ISSN:0008-4042    

DOI:10.1139/v62-135

出版商:NRC Research Press    

年代:1962

数据来源: NRC

摘要:

Irradiation of azides of diterpenoid acids with 1α- and 1β-carboxyl groups gave the corresponding isocyanates and ca. 25% yields of lactams. The azide of hexanoic acid under comparable conditions gave 8% of hexanamide. The reaction has been used to convert podocarpic acid to the enantiomer of the phenol III derived from atisine. This completes the structure proof of the atisine family of alkaloids, the Garrya alkaloids, and related diterpenes, and proves the absolute stereochemistry of these substances.

ISSN:0008-4042    

DOI:10.1139/v62-136

出版商:NRC Research Press    

年代:1962

数据来源: NRC