摘要:

2-Bromo- (II) and 2,2-dibromo-1,3-indandione (III) react with pyridine, 3- and 4-methylpyridine, and 2-, 3-, and 4-pyridinecarboxylic acids to give 1-(3-hydroxy-1-oxo-2-indenyl)-pyridinium hydroxide betaines. In the betaines derived from pyridinecarboxylic acids the negative charge is located not in the carboxylic group but on the carbonyl oxygen atoms.

ISSN:0008-4042    

DOI:10.1139/v59-114

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

From measurements of the gas chromatographic retention volumes, the initial slopes of the adsorption isotherms of nitrogen and the simpler hydrocarbons on a series of steam-activated coconut charcoals were determined. The initial heats of adsorption were obtained in the usual way from the temperature dependence. It was found for all gases that both the initial slope of the isotherm and the initial heat of adsorption decreased with increasing degree of activation of the charcoal (i.e. with increasing surface area per g). This suggests that the higher affinity for the very small pores in less activated material more than counterbalances the lower total surface.Measurements at several different carrier gas flow rates of the relative band width for the charcoals of least and of greatest activation demonstrated, as might be expected, a greater resistance to mass transfer for the former. However, the apparent diffusion coefficients calculated on the assumption that all transport is by gas phase in the pores were nearly the same for each charcoal and showed relatively little variation among the different gases.

ISSN:0008-4042    

DOI:10.1139/v59-115

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

In aconitoline (C33H41O10N), the product of the oxidation of aconitine with chromic acid, the presence of an αβ-unsaturated carbonyl group has been confirmed. The determination of the basic strengths of aconitoline and its various hydrolytic and reduction products revealed a very strong influence of the carbonyl on the basicity of the alkaloid. It was concluded that the secondary hydroxyl that becomes oxidized must be located in close proximity to the nitrogen. Partial structures are suggested to represent both aconitine and aconitoline.

ISSN:0008-4042    

DOI:10.1139/v59-116

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

The preparation and properties of 9-diazoxanthene are described. It reacts with tetrachloro-and tetrabromo-o-benzoquinone, 4-triphenylmethyl-1,2-benzoquinone, and phenanthraquinone to give the cyclic ethers IIIa, IIIb, IV, and V respectively. The action of hydrochloric acid – dioxane solution on the products is stressed.Tetrachloro- and tetrabromo-o-benzoquinone react with xanthione forming the halogenated cyclic ethers IIIaand IIIbrespectively. A 1,2-benzopyran derivative IX is obtained by the action of tetrachloro-o-quinone on coumarin-2-thione. IX is toxic toBiomphalariaboissisnails in high dilution.

ISSN:0008-4042    

DOI:10.1139/v59-117

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

Examination of a number of new phosphorus compounds has provided additional confirmation for many of the group frequencies reported previously. In certain cases additional information has been obtained on the effect of environment on the band positions, and some previously unassigned bands have been attributed to specific structures. In particular, bands previously assigned to P(S), P(S)X, C—H deformation, P—O—(C), P—C, P—S—H, P—S(P), P—N, C—S(P), and C—N(P) are discussed.

ISSN:0008-4042    

DOI:10.1139/v59-118

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

Thecisandtranslactones of cyclohexanol-2-acetic acid and cyclohexanol-2-α-propionic acid have been subjected to alkaline hydrolysis to determine the relative ease of ring opening. In addition, a new synthesis by way of a Reformatsky reaction followed by dehydration and cyclization has been shown to yield thecislactone. Finally, the first overtone band of the fundamental carbonyl stretching frequency has been identified.

ISSN:0008-4042    

DOI:10.1139/v59-119

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

The proton and fluorine high resolution nuclear magnetic resonance spectra ofp-fluorotoluene are discussed in terms of the caseA2A2′X. The 4 × 4 submatrices are diagonalized in analytical form and therefore explicit values for all energy levels can be obtained. The spectra are consistent withwhich may be of theoretical interest.

ISSN:0008-4042    

DOI:10.1139/v59-120

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

Measurements have been made of the equivalent conductances of aqueous solutions of potassium iodate, potassium chlorate, and silver nitrate at 35.00 °C at concentrations ranging from 0.8 × 10−4to 16×10−4 N. From these, the limiting equivalent conductances and association constantsAas obtained by the use of the Fuoss–Shedlovsky extrapolation procedure were found to be at 35.0 °C:

ISSN:0008-4042    

DOI:10.1139/v59-121

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

Partial hydrolysis of the main hemicellulose constituent of sugar maple (Acersaccharum) has yieldedD-xylose,D-galacturonic acid, 4-O-methyl-D-glucuronic acid, and 2-O-(4-O-methyl-α-D-glucosyluronic acid)-D-xylose. Hydrolysis of the fully methylated polysaccharide gave a mixture of 2-O- and 3-O-methyl-D-xylose, 2,3-di-O-methyl-D-xylose, 2,3,4-tri-O-methyl-D-xylose, and 2-O-(2,3,4-tri-O-methyl-α-D-glucosyluronic acid)-3-O-methyl-D-xylose in a mole ratio of 3:111:1:12. The number-average degrees of polymerization of the native and the methylated polysaccharide were 205 and 149, respectively. These data indicate that the hemicellulose is composed of a linear chain of 1,4-linked β-D-xylose residues and that on the average every tenth residue of the chain carries a terminal 4-O-methyl-D-glucuronic acid residue attached through its C2. The structure of the polysaccharide is similar to that of the main hemicellulose component of European beech, white birch, and yellow birch.

ISSN:0008-4042    

DOI:10.1139/v59-122

出版商:NRC Research Press    

年代:1959

数据来源: NRC

摘要:

The isotherms of bromine on eight carbon blacks and on natural graphite have been related to the known structures of these materials. The surface areas can be calculated from the adsorption isotherms and the size of the graphite crystals can be estimated from the extent of hysteresis on desorption. The isosteric heats of adsorption on the surface and between the layers are each 11 kcal mole−1. The formation of residue compounds displaces the isotherms equally at all pressures.

ISSN:0008-4042    

DOI:10.1139/v59-123

出版商:NRC Research Press    

年代:1959

数据来源: NRC