摘要:

AbstractAnion exchange method for the mutual separation of rare earth was studied in methanol‐nitric acid mixed solutions. For each of rare earth element, the distribution coefficients in different concentrations of nitric acid and also in various compositions of methanol solution were studied with the batch equilibrium method. From these distribution coefficients, elution of rare earth by gradient variation in the compositions of methonal was devised. That is, by keeping constant nitric acid at 2 N acidity and gradiently diluting methanol from its original 80% by volume. Results were satisfactory for the mutual separation of the lighter rare earths, but only fairly for the heavier earths.The secondary metal effect for this anion exchange was also studied in 80% by volume of methanol solution by keeping total concentration of nitrate at 0.8N. Distribution coefficients were larger than nitric acid with LiNO3but smaller in the case of NH4NO3and NaNO3. Despite of these difference in distribution coefficients, no remarkable differences were observed for the separation factors of adjacent pair

ISSN:0009-4536    

DOI:10.1002/jccs.197200014

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThe photochemistry of diazomethane in toluene andp‐xylene solutions was investigated. The reactions of methylene with toluene gave eight products. In the diazomethanep‐xylene solution,p‐ethyltoluene, 1,2,4‐trimethylbenzene, 1,4‐dimethylcyclohepatriene‐1,3,5 and three unidentified compounds were found as products of the reaction of methylene withp‐xylene. The relative rates of addition and insertion reaction of methylene with toluene andp‐xylene have

ISSN:0009-4536    

DOI:10.1002/jccs.197200015

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractIn the photolysis of ketene with toluene in the vapor phase, ethylbenzene, xylenes, 2‐methylcycloheptatriene‐1, 3, 5, and three unidentified compounds are found as the products of the reactions of methylene with toluene. In the ketene‐p‐xylene system,p‐ethyltoluene, 1,2,4‐trimethylbenzene, 1,4‐dimethylcyclohepatriene‐1,3,5, and three unidentified compounds are obtained as the products of the reactions of methylene withp‐xylene. The reaction mecha

ISSN:0009-4536    

DOI:10.1002/jccs.197200016

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractEnolisation of acetoacetanilide (AAAH) acetoacet ortho‐toluidide (AATH), 2, 4‐acetoacetxylidide (AAXH), acetoacet‐ortho‐chloroanilide (CAAAH), acetoacetortho‐anisidide (OAAAH), benzoyl‐acetanilide (BAAH) and benzoyl‐meta‐nitro‐acetanilide (NBAAH) have been studied in different solvents of varying polarities, ranging from chloroform (z=63.2) to methanol (Z=83.6) by ultraviolet spectroscopic methods. The low percentages of enol contents in formamide, dimethylformamide and dimethylsulphoxide, may be due to the formation of charge transfer complexes of these solvents with the diketones. Free energy of tautomerisation has also been calculated. The substituents on the phenyl group attached to the nitrogen have no effe

ISSN:0009-4536    

DOI:10.1002/jccs.197200017

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractTwo alkaloids, rosmarinine (I) fromSenecio taiwanensisHayata and integerrimine(II) fromSenecio morrisonensisHayata, were isolated and identified respectively.

ISSN:0009-4536    

DOI:10.1002/jccs.197200018

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractSalvia plebeiaR. Br. is an annual herb of Labiatae and is widely distributed in the central area of Taiwan. It has been used as folk‐medicine for the treatment of hepatitis and tumors.1)From the flavonoid enriched fraction (B) of the alcoholic extracts of this plant, four kinds of flavonoid compound were isolated. Two of these were confirmed as 5,4′‐dihydroxy‐6‐methoxy‐7‐glucosyloxy flavone (I). (homoplantaginin, hispidulin‐7‐glucoside) and 5, 7, 4′‐trihydroxy‐6‐methoxy flavone (II) (hispidulin) on the basis of their spectral, chemical evidences and comparison with authentic samples. The other two were assigned to be 5, 3′, 4′‐trihydroxy‐6‐methoxy‐7‐glucosyloxy flavone (III) (nepitrin, eupafolin‐7‐glucoside) and 5,7,3′,4′‐tetrahydroxy‐6‐methoxy flavone (IV) (eupafolin, nepetin) on the basis of chemical and spectral properties. The flavones, II (hispidulin) and IV (eupafolin), have been shown to have cytotoxic activity against human carcino

ISSN:0009-4536    

DOI:10.1002/jccs.197200019

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractFrom lotus receptacle (seed pod ofNelumbo nucifera Gaertn., four alkaloids, nuciferine (I), N‐nornuciferine (VIII), oxoushinsunine (IX) and N‐norarmepavine (X) were isolated. Identification of these bases were carried out by their spectral data and direct comparison with authentic samples. It is interesting that oxoushinsunine (IX), a cytotoxic alkaloid shows tumor inhibitory activity against nasopharynx carcinoma reported recently by D. Warthen et al13). The biscoclaurine (IV and V) and quaternary water soluble base (VI) only occures in the embryo. Comparison their alkaloids distribution in each part of Formosan lotus was listed in the Tabl

ISSN:0009-4536    

DOI:10.1002/jccs.197200020

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

ISSN:0009-4536    

DOI:10.1002/jccs.197200021

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY