摘要:

A new identification reaction for the distinction between α- and β- or γ-substituted guaiacyl derivatives is described. Relations between structure and distribution coefficients are given and a deviation from Reichl's rule noted. The synthesis of 1-(3-methoxy-4-hydroxyphenyl)-2-propanol is described.

ISSN:0008-4042    

DOI:10.1139/v57-016

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

Graded acid hydrolysis of a soluble wheat bran hemicellulose containingL-arabinose (50%),D-xylose (38.5%), andD-glucuronic acid (9.0%) preferentially removed theL-arabinose giving an insoluble acidic polysaccharide in approximately 25% yield by weight. Methylation studies, periodate oxidation data, and hypoiodite end group estimations showed that the degraded polysaccharide was composed of repeating units of 7-8D-xylopyranose residues joined by β,1 → 4 linkages. To this repeating unit, oneD-glucuronic acid unit was attached by a 1 → 2 glycosidic bond. The cellulolytic enzyme ofMyrotheciumverrucaria, which is specific for β,1 → 4 glycosidic linkages, hydrolyzed the degraded polysaccharide although it had no effect on the parent hemicellulose

ISSN:0008-4042    

DOI:10.1139/v57-017

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

A mass spectrometer equipped for continuous sampling and capable of producing 60 spectra per second has been used to follow the oxidation of acetaldehyde at temperatures in the region of 250 °C. In normal slow oxidation peracetic acid was formed and then decomposed into carbon dioxide, methanol, and water. Under flame conditions peracetic acid built up in an autocatalytic manner during the induction period and vanished suddenly at the onset of the flame. Possible reaction mechanisms are discussed. Temperature surges during cool and hot flames are estimated.

ISSN:0008-4042    

DOI:10.1139/v57-018

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v57-019

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

The synthesis of 17α-methylcorticosterone, a new biologically active homologue of corticosterone and analogue of cortisol, is described. In the course of the work it was observed that the 17-methyl group greatly impeded both the formation and the hydrolysis of a 20-ketal. On the other hand, evidence was obtained that the 11-keto group is not completely unreactive towards ethylene glycol, in the presence ofp-toluenesulphonic acid.

ISSN:0008-4042    

DOI:10.1139/v57-020

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

Representative ω-fluoroalkyl ethers have been synthesized. Their toxicological properties provide evidence for the ruptureinvivoof the ether link. The compound 2-fluoro-1′,2′,2′,2′-tetrachlorodiethyl ether (XIII) shows outstanding activity as a systemic insecticide

ISSN:0008-4042    

DOI:10.1139/v57-021

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

A relationship between the conformations of isomeric cyclohexane derivatives and their physical properties is discussed. The relationship is applied to a variety of polysubstituted monocyclic and polycyclic compounds, to cyclohexenes, and to pyranosides.

ISSN:0008-4042    

DOI:10.1139/v57-022

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

The syntheses and properties of a series of 4,4′-thenylidene bis[N,N-dimethylaniline] compounds, variously substituted in the thiophene ring, are reported. These compounds were tested as redox indicators in the Schoenemann reaction for the detection of phosphonofluoridate esters in solution. The most effective indicator was 4,4′(5-methyl-4-propyl-2-thenylidene)bis[N,N-dimethylaniline]

ISSN:0008-4042    

DOI:10.1139/v57-023

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

The isolation, analysis, and synthesis of the principal product of the ultraviolet (2537 Å) irradiation of aqueous 1,3-dimethyluracil has made it possible to establish that the irradiation results in hydration of the 5:6 double bond of the uracil ring to form 1,3-dimethyl-6-oxy-hydrouracil. This hydration is spontaneously reversible, the dehydration being catalyzed by either acid or base. Kinetic studies of the catalyzed regeneration reactions are reported

ISSN:0008-4042    

DOI:10.1139/v57-024

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

The absorption spectra of methanol, ethanol, isobutanol,tert-amyl alcohol, and octanol-2 were studied in the wavelength region of the first harmonic of the O—H vibration. The data obtained were used in each case to calculate the number of monomers combined to form an association polymer and the equilibrium constant for the association reaction in carbon tetrachloride solution. It was found for all alcohols studied that the association number was between three and four.

ISSN:0008-4042    

DOI:10.1139/v57-025

出版商:NRC Research Press    

年代:1957

数据来源: NRC