摘要:

When phenylalanine-2-C14was fed to sprouting barley the hordenine isolated from the plant was radioactive. The activity in the hordenine was shown by degradation of the alkaloid to be located on the carbon of the side chain β to the aromatic ring. A fraction of the fatty acids present in the roots was more strongly radioactive than the hordenine and must have arisen by the breakdown of the amino acid. The gramine isolated from the shoots was inert. Phenylalanine does not take part in the synthesis of gramine, but it is a precursor of hordenine and, hence, must be converted to tyrosine in barley. This conclusion is supported by the simultaneous synthesis of a radioactive aliphatic acid.

ISSN:0008-4042    

DOI:10.1139/v57-001

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

The solubility of uranium(IV) hydroxide has been measured in sodium hydroxide, water, and perchloric acid solutions. A possible reaction in sodium hydroxide solutions is evaluated.

ISSN:0008-4042    

DOI:10.1139/v57-002

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

A number of 1-(β-hydroxyethyl)-2-(substituted amino)-2-imidazolines have been prepared by the reaction of amines with 1-(β-hydroxyethyl)-2-methylmercapto-2-imidazoline. These intermediates on chlorination and dehydrochlorination give the corresponding 1-substituted-2,3,5,6-tetrahydro-1-imidaz (1,2-a) imidazoles.

ISSN:0008-4042    

DOI:10.1139/v57-003

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

Three artificial graphites have been studied by X-ray, electron microscope, and adsorption techniques. Surface areas were calculated from the adsorption isotherms and from the X-ray spectra. The two sets of areas were of the same order of magnitude and varied from 18 m.2/g. for the graphite of smallest surface area to 385 m.2/g. for the graphite of largest surface area. The appearance of the graphites under the electron microscope was in qualitative agreement with the adsorption and X-ray data.

ISSN:0008-4042    

DOI:10.1139/v57-004

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

An investigation of some substitution reactions of 1-methylpyrrole has indicated that the α-directing effect of the hetero nitrogen during nitration is even less than it is in pyrrole. 3-Nitro-1-methylpyrrole has been prepared together with the 2-isomer by direct nitration of 1-methylpyrrole as well as indirectly. These two compounds have been found to undergo Friedel-Crafts acylation, a reaction not previously reported among simple nitro compounds of the 5-membered heterocycles. It has been found, contrary to the results of previous workers, that direct nitration of pyrrole itself yields a mononitro product containing about 7% of the 3-isomer.

ISSN:0008-4042    

DOI:10.1139/v57-005

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

Sucrose was tritylated and acetylated to give a crystalline tri-O-trityl-penta-O-acetyl sucrose derivative, and detritylation of this product by graded hydrolysis with acetic acid followed by methylation and deacetylation yielded 1′,4,6′-tri-O-methyl sucrose. The structure of the tri-O-methyl sucrose was established by periodate oxidation and by hydrolysis to the correspondingO-methyl ethers of glucose and fructose. Acetyl group migration from C4to C6in the glucose moiety of sucrose probably occurred during the methylation reaction.Some aspects of syntheses involving sucrose are discussed.

ISSN:0008-4042    

DOI:10.1139/v57-006

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

Baptifoline (C15H20O2N2) has been found on spectroscopic evidence to contain a hydroxyl group and an α-pyridone ring. On catalytic hydrogenation it gives rise to tetrahydrobaptifoline, which has been identified asl-hydroxylupanine. Baptifoline is, therefore,l-13-hydroxyanagyrine.

ISSN:0008-4042    

DOI:10.1139/v57-007

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

A method is outlined for the detection of anticholinesterase agents similar to sarin (isopropyl methylphosphonofluoridate) in aqueous solution at concentrations as low as 0.1 p.p.m. in 10 ml. of solution by the use of the Schoenemann reaction. A new series of indicators, 4,4′-(2-thenylidene)bis[N,N-dimethylaniline] variously substituted in the thiophene ring, was used in the investigation. The dependence of color formation on pH, chloride ion concentration, and other factors led to an explanation of the mechanism of the reaction involved. Chloride ion is necessary for the reaction and, in the absence of the indicator, free chlorine can be detected in acid solution. Presumably, then, during acidification perphosphonate ion reacts with chloride ion to give hypochlorous acid, which oxidizes the mono ion of the leuco compound to a dye.Ions such as cyanide ion, with a lower oxidation–reduction potential than the leuco compounds, interfere with the test. Oxidation of the leuco compound by hypochlorous acid is bypassed in the method described for the detection of sarin in the presence of hypochlorous acid.

ISSN:0008-4042    

DOI:10.1139/v57-008

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

It has been shown previously that when adsorbates act as single component complexes, i.e. behave as single substances in complex force fields, volumetric mean adsorbate and mean adsorbent stress intensities can be calculated from adsorption isotherm data. When potentials of surface regions in the micropore system of a porous adsorbent are statistically independent of pore structure, linear mean stress intensities of the solid are related to volumetric means through an equation containing a structure factor which is independent of the nature and pressure of the adsorbed gas.In this paper we present adsorption extension data for an active carbon rod when exposed to helium, hydrogen, nitrogen, argon, krypton, and water at pressures up to 1600 p.s.i. The data suggest that the potentials of the capillary regions are not independent of structure. An empirical correlation factor is introduced and the resulting semiempirical equation describes the data probably within the experimental error.The results suggest that in cases of moderately strong adsorption, adsorption potentials of thick-walled capillary regions are higher than those of thin-walled regions.

ISSN:0008-4042    

DOI:10.1139/v57-009

出版商:NRC Research Press    

年代:1957

数据来源: NRC

摘要:

3,5-Di-O-methyl-D-glucose has been synthesized by methylation of 1,2-O-isopropylidene-6-O-trityl-D-glucofuranose and removal of the blocking groups by acid hydrolysis. The di-O-methyl glucose furnished a crystalline osazone without loss of a methoxyl group and yielded a monobasic and dibasic acid when oxidized by bromine and nitric acid respectively. Both acids formed gamma lactones and crystalline amides by which the parent compound is characterized. The foregoing reactions proved the structure of 3,5-di-O-methyl-D-glucose predicted by its method of synthesis.

ISSN:0008-4042    

DOI:10.1139/v57-010

出版商:NRC Research Press    

年代:1957

数据来源: NRC