摘要:

AbstractThe molecular orbital theory is applied to the treatment of the hyperconjugation in α‐and β‐pyrrolenines, the so‐called desmotropes of pyrrole. The results obtained are listed. Reseonance energies in both pyrrlenines are found to be in agreement with that of normal pyrrole. It is proposed that the desmotropism of this type corresponds to a kind of degeneracy in which each of the desmotropes may be considered as the unperturbe

ISSN:0009-4536    

DOI:10.1002/jccs.195500014

出版商:WILEY‐VCH Verlag    

年代:1955

数据来源: WILEY

摘要:

AbstractIf a mixture of nitrates of thorium, cerium and rare‐earths in 6 N nitric acid was allowed to pass through a column containing anion exchange resins of Amberlite IRA‐400 in nitrate form, thorium could be sharply separated from rare‐earths including cerium. It seemed that thorium might form thoric nitrate complex anion, for they could be retained quantitatively. Although ceric cerium was known to form complex nitrato‐cerate anion in 6 N nitric acid, it could not be retained but was washed out from the column with the other rare‐earths, owing probably to the reduction of ceric ion by t

ISSN:0009-4536    

DOI:10.1002/jccs.195500015

出版商:WILEY‐VCH Verlag    

年代:1955

数据来源: WILEY

摘要:

AbstractGreenish yellow Pr(C9H6NO)4·H2O has been prepared in the same manner as the 8‐hydroxyquinolinate of quadripositive neodymium(1). The quadrivalence of praseodymium has been confirmed bromometrically, 15 bromine atoms being needed to brominate one molecule of the substance.Yellow Pr(C9H6NO)3· H2O has also been prepared by the addition of alcoholic solution of 8‐hydroxyquinoline to a dilute aqueous solution of Pr(NO3)3and bromometrically t

ISSN:0009-4536    

DOI:10.1002/jccs.195500016

出版商:WILEY‐VCH Verlag    

年代:1955

数据来源: WILEY

摘要:

AbstractThe existence of the oxine‐sulfonic acid complex anion of quadripositive neodymium, [Nd (C9H5NOSO3)4]4−has been verified.The atomic ratio of neodymium to sulfur in the electrolyzed oxine‐sulfonic acid complex anion was determined and found to be 1:4, while before electrolysis, the ratio was practicall

ISSN:0009-4536    

DOI:10.1002/jccs.195500017

出版商:WILEY‐VCH Verlag    

年代:1955

数据来源: WILEY

摘要:

AbstractA natural tropoloid, previously unknown, has been isolated. On fusion with potassium hydroxide, it gave 2‐hydroxy‐4‐isopropyl‐benzo

ISSN:0009-4536    

DOI:10.1002/jccs.195500018

出版商:WILEY‐VCH Verlag    

年代:1955

数据来源: WILEY

摘要:

AbstractN‐p‐Chlorophenyl‐N′, N′‐dimethylurea (CMU) was synthesized by the reaction of p‐chlorophenyl isocyanate with dimethylamine in mono‐chlorobenzene. The yield was 82.17%. p‐Chlorophenyl isocyanate was prepared by heating p‐chlorocarbamyl chloride, which was synthesized by phosgenation of p‐chloroaniline in ethylene chloride. p‐Chlorophenyl carbamyl chloride was crystallized as colorless needles

ISSN:0009-4536    

DOI:10.1002/jccs.195500019

出版商:WILEY‐VCH Verlag    

年代:1955

数据来源: WILEY

摘要:

AbstractPure furural, or furfural obtained from pentose by sulfuric acid catalyzed distillation was found to react with anthrone reagent at 0°C. The resulting reaction mixture acquired the characteristic color sufficiently permanent to permit colorimetric determinations. This two‐step anthrone reaction was found to be suited for the estimation of pentose fairly contaminated with hexose. Pure pentose samples were determined successfully by the ferric chloride sensitized one‐step method. The role of ferric chloride in the anthrone reaction of pentose was studied and discu

ISSN:0009-4536    

DOI:10.1002/jccs.195500020

出版商:WILEY‐VCH Verlag    

年代:1955

数据来源: WILEY

摘要:

AbstractThe influence of the pH on the constituents of the gummy substance, precipitated by addition of ethanol, was investigeted. Paper chromatography was applied for the identification of the carbohydrates in the hydrolyzate of the gummy substance, and the presence of arabinose, galactose, xylose, and uronic acid was confirmed. The identification of amino acids was brought about by paper chromatography. The hydrolyzate gave eighteen spots and ten of them were identified as glutamic acid, cysteine, glycine, lysine, histidine, arginine, alanine, valine, leucine and aspartic acid.

ISSN:0009-4536    

DOI:10.1002/jccs.195500021

出版商:WILEY‐VCH Verlag    

年代:1955

数据来源: WILEY

摘要:

AbstractFor the production of citric acid by fermentation a strain of Aspergillus niger 4022‐15 was used. The composition of the basal culture solution was kept simple and contained only ammonium nitrate, potassium acid phosphate, magnesium sulfate and sucrose. Camphor 1‐2 ppm and zinc sulfate 10‐20 ppm were added to the basal solution to accelerate the production of citric acid. In the favourable condition 46% of sucrose was converted into citric

ISSN:0009-4536    

DOI:10.1002/jccs.195500022

出版商:WILEY‐VCH Verlag    

年代:1955

数据来源: WILEY

ISSN:0009-4536    

DOI:10.1002/jccs.195500023

出版商:WILEY‐VCH Verlag    

年代:1955

数据来源: WILEY