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Volume 18, Issue 11
Displaying 1-42 of 42 articles from this issue
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SHOSHICHIRO KIMOTO, MASAO OKAMOTO, MASASHI UNEO, SHUNSAKU OHTA, MASANO ...1970 Volume 18 Issue 11 Pages 2141-2145
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSTwo isomers of trans-4-hydroxy-2-methyldecahydroisoquinoline were prepared and the conformation of these compounds was discussed.View full abstractDownload PDF (624K) -
MINORU SEKIYA, SHUICHI TAKAYAMA1970 Volume 18 Issue 11 Pages 2146-2150
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSTMAF, 5HCO2H·2N (CH3)3 was found to be efficient reagent for reduction of nitrosobenzenes to azoxybenzenes. Reductions of a variety of nitrosobenzenes revealed the usefulness of the method for the preparation of azoxybenzenes. Comments on the course of the reduction are given.View full abstractDownload PDF (687K) -
KAZUYA KOHASI, YOSUKE OHKURA, TSUTOMU MOMOSE1970 Volume 18 Issue 11 Pages 2151-2157
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSTwo coloring matters produced in the color reaction of acetone with excessive 1, 3, 5-trinitrobenzene in an alkaline medium were separated in crystalline forms and one of them was determined as the Meisenheimer type complex of acetone (I). The other was a new type complex (II) and was characterized as a sodium salt of the anion group shown in Chart 1. Spectrophotometric studies of I, II and the color reaction showed that I formed in the early stage of the reaction and then changed to II with time in the alkaline medium in the presence of excessive trinitrobenzene. In addition, a reason for increase of the color intensity in the improved procedures of the detection and determination of acetone was clarified by studying spectrophotometrically some behaviors of I and II.View full abstractDownload PDF (812K) -
MICHIKO TOMIZAWA, TAMOTSU KONDO1970 Volume 18 Issue 11 Pages 2158-2163
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSAn investigation was made of the effect of ionic head of cationic surface active agents on their hemolytic activity. When the number of carbon atoms in the alkyl radical is less than 8, there appeared to exist a close relation between the adsorbability and the hemolytic activity (amount adsorbed per cell necessary to cause hemolysis) of the cationic agents. However, no direct correlation could be found if the number of carbon atoms exceeds 8. This was interpreted as implying that too high the adsorbability of surface active cations with a long hydrophobic tail and a large ionic head may adversely affect the hemolytic activity of these ions.View full abstractDownload PDF (641K) -
YOSUKE OHKURA, JUNKO MURAKAMI, JUNZO SHIOTA, TSUTOMU MOMOSE1970 Volume 18 Issue 11 Pages 2164-2168
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSFour main coloring matters (I, II, III and IV) were isolated in crystalline forms in the color reaction of 2, 4-dinitroaniline with potassium cyanide and their chemical structures were investigated. I was determined as 2, 3-diamino-6-nitrobenzamide. II and III were characterized as 2, 3-dihydro-3-oxo-1H-indazole derivatives as shown in Chart 1. IV was 2, 6-dinitro-3-aminophenol. The schema of reaction to form those coloring matters was also presented.View full abstractDownload PDF (646K) -
KENICHI HIRAO, SATORU MITSUBAYASHI, JUN UZAWA, AKIRA TAHARA, NORIKO MI ...1970 Volume 18 Issue 11 Pages 2169-2175
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSTemperature dependent proton magnetic resonance studies of four basic ring C aromatic tricyclic diterpenes (I, II, III and IV) are discussed and shown to be able to characterize each stereoisomers. This method is also applied to the analysis of 7-oxo and 20-nor derivatives.View full abstractDownload PDF (759K) -
KIICHIRO KAKEMI, HITOSHI SEZAKI, MASAHIRO NAKANO, ETSUKO SUZUKI1970 Volume 18 Issue 11 Pages 2176-2182
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSComplexation influence on the rate of absorption of actively transported drug was investigated in the perfused rat small intestine employing L-tryptophan as a model drug and caffeine, 8-chlorotheophylline, 8-methoxycaffeine, 7-hydroxyethyltheophylline, and flavin mononucleotide as complexing agents. Preliminary experiment on the absorption of L-tryptophan by the in situ intestinal perfusion method revealed that the kinetical pattern of the absorption of L-tryptophan approximated to the Michaelis-Menten relationship, D-isomer was also absorbed from the small intestine with apparently minor contribution by a specialized amino acid transport system, and that little absorption occured for both compounds in the rectum. Among the complexing agents studied, 7-hydroxyethyltheophylline and flavin-mononucleotide (FMN) reduced the absorption of L-tryptophan considerably. In the former, mutual effect in the reduction of absorption was observed. For the latter, reduction of the rate of absorption of L-tryptophan was caused neither by direct effect on the absorptive membrane nor by imparing effect on the neutral amino acid transport system but by the decrease of thermodynamic activity of L-tryptophan resulting from molecular complexation with FMN in solution.View full abstractDownload PDF (765K) -
MAMORU KAMIYA, YUKIO AKAHORI1970 Volume 18 Issue 11 Pages 2183-2189
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSIt has been found that photo-reversible electron spin resonance signals are observed on low-temperature irradiation into various powdered complexes composed of anil and phenothiazine. And on the basis of studies on the photo-stationary structure and photo-after decay rate of the spectrum, a main component of the signal has been proposed as phenothiazine cation which is produced by a charge-transfer type interaction with the photocolored quinoidlike form of anil.View full abstractDownload PDF (779K) -
MAMORU KAMIYA, YUKIO AKAHORI1970 Volume 18 Issue 11 Pages 2190-2194
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSThe π-electronic structures of the photochromic salicylideneaniline tautomers were investigated on the basis of the Pariser-Parr-Pople method. The calculated results were used for interpretation of the experimental ultraviolet spectra and the effects of the π-π* excitation upon the intramolecular hydrogen-transfer.View full abstractDownload PDF (653K) -
MITSUO AKIBA, SADAO OHKI1970 Volume 18 Issue 11 Pages 2195-2203
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSAs a preliminary for the synthesis of 10-aza-steroids, enamine reaction of 3-oxo-steroids was examined. The reaction of 3-oxo-steroids with ethyl 2-piperidinoacetate (III) through intramolecular cyclization via their enamine, 17-acetoxy-5β-androstano-[4, 3-c] quinolizidin-2'-one (I) and its related compound were synthesized and their conformation and configuration were examined.View full abstractDownload PDF (912K) -
HARUO OGURA, TSUNEO ITOH, SHINGO SUGIMOTO1970 Volume 18 Issue 11 Pages 2204-2207
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSImidazo [2, 1-b] benzoxazoles which have a new ring system were synthesized. Condensation reaction of 2-aminobenzoxazole (I) and bromoacetone afforded 2-imino-3-(2-oxopropyl)-2, 3-dihydrobenzoxazole (IIa). When phenacyl bromide was used instead of bromoacetone, 2-imino-3-phenacyl-2, 3-dihydrobenzoxazole (IVa) was obtained. Cyclization of these imino-derivatives afforded imidazo [2, 1-b] benzoxazoles. On the other hand, imidazo [2, 1-b] benzoxazole (XIII) was prepared from 1-(o-chlorophenyl)-2-hydroxyimidazole (XI) via benzyne intermediate.View full abstractDownload PDF (443K) -
YOSHIAKI WATANABE, KIYOSHI NAKAJIMA, TERUYA SEKI, HIKARU OZAWA1970 Volume 18 Issue 11 Pages 2208-2215
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSThe total syntheses of naturally occurring rhodoquinone-9 (I, n=9) and related compounds are described. The key intermediate, 2-halogeno-3-methoxy-6-methyl-1, 4-benzoquinone (VI), was easily obtained by 5 steps starting from p-cresol. i) Reduction of VI and condensation of the resulting hydroquinone (IX) with solanesol in the presence of BF3·ether gave the nonaprenylated hydroquinone, which, on oxidation with Ag2O, was transformed to 2-halogeno-3-methoxy-5-nonaprenyl-6-methyl-1, 4-benzoquinone (X). Treatment of X with NaN3 followed by reduction gave the azido hydroquinone from which rhodoquinone-9 (I, n=9) was prepared through pyrolysis. ii) Reaction of VI with NaN3 followed by reduction gave the azido hydroquinone which was converted to rhodoquinone-0 (I, n=0) by pyrolysis. iii) An attempt to obtain (I, n=0) by direct conversion of the Br atom of VI to amino group failed, but 2-bromo-3-amino-6-methyl-1, 4-benzoquinone (VII) and the cyclohexenedione compound (VIII) were obtained.View full abstractDownload PDF (915K) -
EIICHI FUJITA, KIYOSHI BESSHO, KAORU FUJI, AKIHISA SUMI1970 Volume 18 Issue 11 Pages 2216-2223
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSNovel alkaloids, lythranine (III), lythranidine (VI), and lythramine (VII), were isolated from Lythrum anceps MAKINO. Lythranine, C28H37O5N, was hydrolyzed with weak alkali to give lythranidine, C26H35O4N. Lythranine on reaction with formalin gave lythramine, C29H37O5N. Functional groups were investigated on these alkaloids and all of the O- and N-functions were clarified.View full abstractDownload PDF (947K) -
MASAKAZU ARITOMI, TOSHIO KAWASAKI1970 Volume 18 Issue 11 Pages 2224-2234
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSA new xanthone C-glycoside, named homomangiferin, C19H17O10 (OCH3)·1.5H2O, decomposing over 250° without melting, [α]14D+8.7° (pyridine), was isolated from crude mangiferin obtained from the bark of Mangifera indica L. On the basis of chemical and spectral data, it has been formulated as 2-C-β-D-glucopyranosyl-3-methoxy-1, 6, 7-trihydroxyxanthone (II), i.e., 3-O-methylmangiferin. Of four possible monomethyl ethers in the aglycone moiety of mangiferin (I), the three, 1-, 3- and 7-methyl ethers, have been synthesized and the identity of homomangiferin with synthetic 3-O-methylmangiferin was confirmed by direct comparison. The nuclear magnetic resonance spectra of natural and synthetic II and of the heptaacetate (III) measured in pyridine solution showed the signals of methoxyl and acetoxyl groups as a doublet at room temperature (20-23°) and as a sharp singlet at 50°, whereas the methoxyl signals of 1-O- and 7-O-methylmangiferins (VII, XI) and of swertisin (6-C-β-D-glucopyranosyl-7-methoxy-4', 5-dihydroxyflavone) (XIV) appeared as a sharp singlet.View full abstractDownload PDF (1168K) -
ZENICHI HORII, SANGWON KIM, TAKESHI IMANISHI, TAKEFUMI MOMOSE1970 Volume 18 Issue 11 Pages 2235-2241
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSA tricyclic key intermediate (II) for the lycopodine and the lycodine type of alkaloids was synthesized from 9-oxobicyclo (3, 3, 1) nonene system (IV) by a series of reactions shown in Chart 2. Dehydration of II with strong acid resulted in the rearrangement of carbon skeleton into an enamino-ketone (III). The stereochemistry of stereoselective C9-alkylation in IV with sulfonium ylid was also discussed.View full abstractDownload PDF (849K) -
MINORU SEKIYA, JIRO SUZUKI1970 Volume 18 Issue 11 Pages 2242-2246
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSA series of 5-aminooxazole-4-carboxamides were obtained from 2-acylamino-2-cyano-acetamides by influence of hydrogen chloride. From these products syntheses of the corresponding oxazolo [5, 4-d] pyrimidines were performed by the methods through 5-ethoxymethyleneaminooxazole-4-carboxamides as intermediates.View full abstractDownload PDF (702K) -
KAZUTAKA TANIZAWA, SHINICHI ISHII, YUICHI KANAOKA1970 Volume 18 Issue 11 Pages 2247-2252
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSIsomers of benzamidine series containing a hydrolyzable ester group have been synthesized : Ethyl 1a and p-nitrophenyl p-amidinobenzoates 1b, and ethyl 2a and p-nitrophenyl m-amidinobenzoates 2b. The p-isomers 1a, 1b were found to be fairly good substrates while the m-isomers 2a, 2b were poor substrates in spite of their good binding for trypsin as measured by kinetic treatment. Characteristic behaviors of these isomers to trypsin were interpreted in terms of the structural requirements of the active center of the enzyme by taking advantage of their reigid conformations.View full abstractDownload PDF (685K) -
TOYOSHIGE KABEYA, YOSUKE OHKURA, TSUTOMU MOMOSE1970 Volume 18 Issue 11 Pages 2253-2258
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSNew automated methods are presented for the determination of urea nitrogen in serum using undiluted and diluted samples. It is based on the previously established color reaction of urea with diacetyl monoxime in phosphoric acid solution in the presence of D-glucuronolactone. The methods give reproducible and reliable results, and the diacetyl monoxime-glucuronolactone reagents modified for the methods are very stable.View full abstractDownload PDF (637K) -
SHINSAKU NATORI, SETSUKO SAKAKI, HIROSHI KURATA, SHUNICHI UDAGAWA, MAS ...1970 Volume 18 Issue 11 Pages 2259-2268
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSThirty-three strains of Aspergillus ochraceus isolated from foods in Japan were examined for the bioproduction of toxic metabolites, and the formation of ochratoxins by two strains and of penicillic acid by twenty-eight strains was proved. The two toxins and other metabolites were isolated and identified. Toxicities shown by the metabolites were examined by HeLa cells and the relation with some metabolites was discussed from the similarities of morphological pattern by a group of strains.View full abstractDownload PDF (1719K) -
TETSUZO KATO, NOBUYA KATAGIRI1970 Volume 18 Issue 11 Pages 2269-2277
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESS1, 3-Dipolar cycloaddition of phenylhydrazones (I) with diketene to give 4-acetyl-2-phenylpyrazolidin-3-one derivatives (II) was investigated. Refluxing of diketene with phenylhydrazone of aromatic ketone and aldehyde, such as acetophenone phenylhydrazone (Ia), benzophenone phenylhydrazone (Ib), benzaldehyde phenylhydrazone (Ig), and cinnamicaldehyde phenylhydrazone (Ih) in acetic acid gave the corresponding substituted pyrazolidin-3-ones ; i.e., 4-acetyl-2, 5-diphenyl (IIa), 4-acetyl-2, 5, 5-triphenyl (IIb), 1, 4-diacetyl-2, 5-diphenyl (IIg), and 1, 4-diacetyl-2-phenyl-5-styryl (IIh) compounds. Similar treatment of aliphatic ketone phenylhydrazones, such as acetone phenylhydrazone (Ic), methylethylketone phenylhydrazone (Id), cyclopentanone phenylhydrazone (Ie), and cyclohexanone phenylhydrazone (If), afforded resinous products, but the reaction was carried out in benzene with a catalytic amount of acetic acid, 4-acetyl-5, 5-dimethyl-2-phenylpyrazolidin-3-one (IIc), 4-acetyl-5-ethyl-5-methyl-2-phenylpyrazolidin-3-one (IId), 4-acetyl-2-phenylspiro (pyrazolidin-5, 1'-cyclopentane)-3-one (IIe), and 4-acetyl-2-phenylspiro (pyrazolidin-5, 1'-cyclohexane)-3-one (IIf) were obtained.View full abstractDownload PDF (918K) -
TETSUZO KATO, NOBUYA KATAGIRI1970 Volume 18 Issue 11 Pages 2278-2283
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSReaction of aromatic ketone semicarbazone, such as propiophenone semicarbazone (VIIa), acetophenone semicarbazone (VIIb) and benzophenone semicarbazone (VIIc), with diketene in glacial acetic acid gave the N-alkylidene aminouracil derivatives (VIIIa-c) in good yield. Hydrolysis of VIIIa-c with 10% hydrochloric acid afforded 1-amino-6-methyluracil (IX). Similarly, benzaldehyde semicarbazone (VIId) reacted with diketene to give 1-benzalamino-6-methyluracil (VIIId), which, on catalytic reduction, was reduced to 1-benzylamino-6-methyluracil (XIV). Reaction of aliphatic ketone semicarbazone, such as acetone semicarbazone (VIIe), methylethylketone semicarbazone (VIIf), and cyclohexanone semicarbazone (VIIg), did not afford the VIII-type compounds, but gave IX.View full abstractDownload PDF (615K) -
HIROSHI KUGITA, HIROZUMI INOUE, MUNEYOSHI IKEZAKI, MIKIHIKO KONDA, SAT ...1970 Volume 18 Issue 11 Pages 2284-2289
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSThreo-2-hydroxy-3-aryl-(2-nitroarylthio) propionates (III-β) were obtained by the reaction of 2-nitrothiophenols (I) and arylglycidic esters (II) in the presence of catalytic amount of NaHCO3. Conversion of III-β to 1, 5-benzothiazepine derivatives (VI-β), the configuration of which was 2, 3-trans, was satisfied by the similer method as that in our previous paper.View full abstractDownload PDF (605K) -
HISASHI NOGAMI, TSUNEJI NAGAI, AKIRA KONDO1970 Volume 18 Issue 11 Pages 2290-2296
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSDissolution studies of fractionated polyvinylpyrrolidone (PVP) in acetone-water (4 : 1) were carried out according to the rotating disk method. It was considered from the anomalous viscosity that PVP of low molecular weight (below 10000) behaved as an polyelectrolyte. Three stages of dissolution were observed with the lapse of time, i.e., the initial, the main and the final ones, as described in a previous paper. The initial stage was shortened with the decrease in molecular weight. Analyzing the dissolution rate of PVP of the main stage, the dissolution rate constant, KT, was expressed as a function of the molecular weight, M, and the absolute temperature, T, as follows : KT=a·exp [[-ln {a/(KT)x}]·M/Mx]·exp {-b (1-M/Mx)/RT} where R is the gas constant ; (KT)x and Mx are the converging dissolution rate constant and the converging molecular weight, respectively, of the plots of log KT at various temperatures against M ; a and b are theoretically the frequency factor and the activation energy, respectively, at M=0. The decrease in viscosity of acetone-water (4 : 1) with addition of PVP was considered due to the destruction of structure and it was concluded that the destruction of acetonewater structure by the dissolved molecule might be an important factor affecting the dissolution rate constant, KT.View full abstractDownload PDF (626K) -
HISASHI NOGAMI, JUN HASEGAWA, MOTOHARU IWATSURU1970 Volume 18 Issue 11 Pages 2297-2302
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSAcylcholinesters (C3 to C12) were synthesized and the stabilization effect by sodium lauryl sulfate (SLS) against hydrolysis were studied at pH 7.7. 1) The apparent distribution of cholinesters between aqueous and micellar phases of SLS solution was measured by condensation method. The correlation between the apparent distribution and the magnitude of stabilization effect was observed. 2) The hydrolytic rate of cholinesters was suppressed from 1/2 to 1/250 by the addition of 0.5% SLS. The longer the acyl chain length of cholinesters, resulted the greater the stabilization effects of SLS. There was no apparent relation between chain length and rate constant without SLS. 3) When cholinesters were mixed with SLS in aqueous solution, transient turbidity formation was observed, which was considered to be due to the metathesis. A complete dissociation of three salts concerning to the metathesis was proved by the determination of conductivity. 4) The solubility of acylcholine iodides in water was high and that of in organic solvents was limited by the polarity of the cholinesters regardless of their acylchain length. Therefore, the mechanism of stabilization from hydrolysis was considered via the solubilization of acylcholine-lauryl sulfate ion pair into micellar phase. 5) From the correlation mentioned above, it was presumed that the site of solubilization and/or the dimentional change of micelle might affect the stabilization from hydrolysis.View full abstractDownload PDF (646K) -
TOHRU UEDA, IKUKO KAWAI1970 Volume 18 Issue 11 Pages 2303-2308
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSAdenosine 5'-phosphate was converted to the 2', 3'-cyclic phosphate by the treatment with dimethylformamide at reflux temperature. The reaction was shown to be proceeded by the initial release of the phosphoryl group as an"activated phosphoric acid"and rephosphorylated to furnish the 2', 3'-cyclic phosphate. In fact a ribonucleoside and phosphoric acid, pyrophosphoric acid, or polyphosphoric acid gives a 2', 3'-cyclic phosphate in a satisfactory yield in refluxing dimethylformamide. This procedure will serve for the preparation of the 2', 3'-cyclic phosphate of synthetic ribonucleoside of a limited quantity.View full abstractDownload PDF (651K) -
TOSHIO NAMBARA, HIROI TAKAHASHI1970 Volume 18 Issue 11 Pages 2309-2313
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSThe metabolic fate of 3-deoxydehydroepiandrosterone (DDHA) in rabbit has been investigated. After oral administration of the steroid, six main metabolites (A-F) were separated from the collected urine specimen. The structures of these biotransformation products could be characterized either by direct comparison with the authentic sample or by leading to the known compound, respectively. The biochemical significance of in vivo transformation of C19 steroid lacking an oxygen function at C-3 has been discussed.View full abstractDownload PDF (622K) -
HIROSHI NAKAMURA, ZENZO TAMURA1970 Volume 18 Issue 11 Pages 2314-2321
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSDisaccharides in a mixture are reduced to the corresponding disaccharide alditols with sodium borohydride and analysis is performed as trimethylsilyl or trifluoroacethyl derivatives by gas chromatography. Trifluoroacetylation of carbohydrates with trifluoroacetic anhydride is accomplished in N, N-dimethylformamide in a few minutes at room temperature. Quantitative analysis in microscale is achieved both by the extraction of trimethylsilyl derivatives with n-hexane from the reaction mixture and by the use of an electron capture detector sensitive to TFA derivatives. Determination limits of 0.5μg of disaccharide as TMS derivative and 0.1 μg as TFA derivative are successfully achieved.View full abstractDownload PDF (871K) -
The Effect of Xenogenic and AIIogeneic Tumor CeIIs on ExperimentaI Metastasis with Ehrlich Carcinoma1970 Volume 18 Issue 11 Pages 2322-2326
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSDownload PDF (522K) -
MASAKAZU ARITOMI, TOSHIO KAWASAKI1970 Volume 18 Issue 11 Pages 2327-2333
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSA new xanthone C-glucoside, C19H18O11·1/2H2O, decomposing over 260° without melting, [α]21D+5.5° (pyridine), was isolated in a pure state along with mangiferin (I) from the aerial parts of Anemarrhena asphodeloides BUNGE (Liliaceae) and named isomangiferin. On the basis of chemical and spectral data, it has been assigned the structure 4-C-β-D-glucopyranosyl-1, 3, 6, 7-tetrahydroxyxanthone (XV), the first position isomer of I to be found and isolated. The relation between XV and I, in structures and properties, is corresponding to that between flavonoid 8-C- and 6-C-glucosides such as orientin and isoorientin.View full abstractDownload PDF (854K) -
YOSHIRO KOBAYASHI, ITSUMARO KUMADAKI, SUSUMU SATO, NOBUTOSHI HARA, EII ...1970 Volume 18 Issue 11 Pages 2334-2339
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSTrifluoromethyl iodide reacts with aryl halide in the presence of copper powder to give aryltrifluoromethane derivatives in a fairly good yield. This newly observed reaction is applicable to heterocyclic halides as well as benzene derivatives. Activities of halides are in the following order of readiness : iodide>bromide>chloride. Effects of solvents and natures of copper were examined.View full abstractDownload PDF (657K) -
JUICHIRO SHIBASAKI, ETSUKO SADAKANE, RYOJI KONISHI, TAMOTSU KOIZUMI1970 Volume 18 Issue 11 Pages 2340-2343
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
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EIICHI FUJITA, TETSURO FUJITA, YOSHIMITSU NAGAO1970 Volume 18 Issue 11 Pages 2343-2345
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSDownload PDF (471K) -
KAZUTAKA TANIZAWA, SHINICHI ISHII, YUICHI KANAOKA1970 Volume 18 Issue 11 Pages 2346-2348
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSDownload PDF (471K) -
YOSHINARI HASEGAWA, TSUTOMU IRIKURA, DENICHI MIZUNO1970 Volume 18 Issue 11 Pages 2348-2350
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
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MASAHIRO HAYASHI, TSUNEJI NAGAI, HISASHI NOGAMI1970 Volume 18 Issue 11 Pages 2350-2353
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
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KANAME TAKAGI, KATSUHIKO NAGAHARA, TAKEO UEDA1970 Volume 18 Issue 11 Pages 2353-2356
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
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ZENZO TAMURA, YOICHI IITAKA, HIROYA TANABE, SADAO UCHIYAMA1970 Volume 18 Issue 11 Pages 2359-2361
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
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YOSHIO ARATA, TOYOHIKO KOBAYASHI1970 Volume 18 Issue 11 Pages 2361-2363
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
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ITIRO YOSIOKA, YUTAKA MORITA, KIKUKO EBIHARA1970 Volume 18 Issue 11 Pages 2364-2366
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
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HIROSHI NAKAMURA, ZENZO TAMURA1970 Volume 18 Issue 11 Pages 2366-2367
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
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K.A. WATANABE, I. WEMPEN, J.J. FOX1970 Volume 18 Issue 11 Pages 2368-2371
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
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TSUTOMU FURUYA, HISASHI KOJIMA, KUNIHIKO SYONO, TAKAFUMI ISHII1970 Volume 18 Issue 11 Pages 2371-2372
Published: November 25, 1970
Released on J-STAGE: March 31, 2008
JOURNAL FREE ACCESSDownload PDF (304K)
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