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1.
V. I. Grishkovets E. A. Sobolev A. S. Shashkov V. Ya. Chirva 《Chemistry of Natural Compounds》2000,36(5):501-505
The previously known triterpenoid 3-O--L-arabinopyranosides of oleanolic and echinocystic acids and hederagenin, 3-O--D-glucopyranosyl-(12)-O--L-arabinopyranosides of oleanolic acid and hederagenin, in addition to 28-O--L-rhamnopyranosyl-(14)-O--D-glucopyranosyl-(16)-O--D-glucopyranosyl ethers of the 3-O--L-arabinopyranoside of hederagenin, and 3-O--D-glucopyranosyl-(12)-O--L-arabinopyranosides of oleanolic acid and hederagenin, respectively, are isolated from leaves ofFatsia japonica(Araliaceae). The structures of the glycosides are confirmed by chemical methods and
13
C NMR spectroscopy 相似文献
2.
V. G. Strigunov N. I. Grishkovets N. V. Tolkacheva A. S. Shashkov 《Chemistry of Natural Compounds》2001,37(2):173-176
Stem bark ofTetrapanaxpapyriferum yielded the new triterpene glycosides 3-O-[-D-glucopyranosyl-(13)]--D-galactopyranosyl-(12)-O--L-arabinopyranosides of oleanolic and echinocystic acids and their 28-O--L-rhamnopyranosyl-(14)-O--D-glucopyranosyl-(16)-O--D-glucopyranosyl esters. Their structures were established using chemical and physicochemical methods 相似文献
3.
A. S. Stolyarenko V. I. Grishkovets A. S. Shashkov V. Ya. Chirva 《Chemistry of Natural Compounds》2000,36(3):295-298
The structures of four triterpene glycosides from leaves ofScheffleropsis angkae (Araliaceae) are established using chemical and NMR methods. The structures 3-O--D-glucopyranosyl-(1-3)-O--L-arabinopyranosides of oleanic and ursolic acids and their 28-O--L-rhamnopyranosyl-(1-4)-O--gentiobiosyl ethers are proposed for L-E1, L-E2, L-K1, and L-K2, respectively. L-K1 and L-K2 are new triterpene glycosides.Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 239–241, May–June, 2000. 相似文献
4.
E. A. Sobolev V. V. Kachala V. I. Grishkovets A. S. Shashkov V. Ya. Chirva 《Chemistry of Natural Compounds》2001,37(3):259-261
Seeds ofFatsia japonica(Araliaceae) afforded the known hederagenin 3-O--D-glucopyranosyl-(12)-O--L-arabinopyranoside and the new triterpene glycoside D
2
, for which the structure hederagenin 3-O--D- galactopyranosyl-(12)-O--L-arabinopyranoside was proposed based on chemical methods and NMR spectroscopy 相似文献
5.
Triterpene glycosides ofScheffleropsis angkae. I. Structure of glycosides L-B1, L-B2, L-H1, and L-H2
A. S. Stolyarenko V. I. Grishkovets N. N. Arnautov S. V. Ikasanova V. Ya. Chirva 《Chemistry of Natural Compounds》2000,36(2):173-176
The structures of four triterpene glycosides from the leaves ofScheffleropsis angkae (Araliaceae) are found by chemical methods and NMR spectroscopy to be the 3-O--L-arabinopyranosides of oleanic and ursolic acids and their 28-O--L-rhamnopyranosyl-(14)-O--gentiobiosyl esters, which are designated L-B1, L-B2, L-H1, and L-H2, respectively. The glycoside L-H2 is new.Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 136–138, March–April, 2000. 相似文献
6.
V. I. Grishkovets E. A. Sobolev V. V. Kachala A. S. Shashkov V. Ya. Chirva 《Chemistry of Natural Compounds》2002,38(3):264-267
Seeds of Fatsia japonica (Araliaceae) yielded the new glycosides of gypsogenin: 3-O--D-glucopyranosyl-(12)-O--D-glucopyranoside and 3-O--D-galactopyranosyl-(12)-O--D-glucopyranoside. The structures of these compounds were established by chemical methods and NMR spectroscopy. 相似文献
7.
V. I. Grishkovets A. E. Kondratenko A. S. Shashkov V. Ya. Chirva 《Chemistry of Natural Compounds》1999,35(1):70-72
From the leaves of English ivyHedera helix L. we have isolated the known 3-sulfates of oleanolic and echinocystic acids and their 28-O--L-rhamnopyranosyl-(14)-O--D-glucopyranosyl-(16)-O--D-glucopyranosyl esters and the new 3-sulfate of 28-O--gentiobiosyl oleanolate — helicoside L-8a. The structures of the compounds isolated were deduced from the results of chemical transformations and NMR spectroscopy.Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 87–90, January–February, 1999. 相似文献
8.
V. I. Grishkovets V. S. Strigunov A. S. Shashkov V. Ya. Chirva 《Chemistry of Natural Compounds》2001,37(2):167-172
Stem bark ofTetrapanax papyriferumC. Koch., Araliaceae, yielded new triterpene glycosides 28-O--L-rhamnopyranosyl-(14)-O-(6-O-acetyl--D-glucopyranosyl)-(16)-O--D-glucopyranosyl esters of the 3-O-[-D-glucopyranosyl-(13)-[-D-galactopyranosyl-(12)]-O--L-arabinopyranosides of oleanolic and echinocystic acids. The structures of these substances were established using chemical and physicochemical methods 相似文献
9.
L. A. Yakovishin V. I. Grishkovets I. N. Shchipanova A. S. Shashkov V. Ya. Chirva 《Chemistry of Natural Compounds》1999,35(1):65-69
Three minor partially acetylated glycosides have been isolated from the leaves of Algerian ivy, Hedera canariensis Willd. (Araliaceae) — the previously known {3-O-[-L-rhamnopyranosyl-(12)-O--L-arabinopyranoside] 28-O-[-L-rhamnopyranosyl-(14)-O-(6-acetyl--D-glucopyranosyl)-(16)-O--D-glucopyranoside}s of oleanolic acid and of hederagenin (ciwujianoside C4 and kizuta saponin K11) and the new 3-O-[-L-rhamnopyranosyl-(12)--O-L-arabinopyranoside] 28-O-[-L-rhamnopyranosyl-(14)-O-(6-O-acetyl--D-glucopyranosyl)-(16)-O--D-glucopyranoside of echinocystic acid (glycoside L-G0). The structures of the glycosides isolated have been established on the basis of chemical transformations and1H and13C NMR spectroscopy.Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 81–86, January–February, 1999. 相似文献
10.
Summary FromAllium narcissiflorum Wells have been isolated for the first time trillin and a glycoside B, which proved to be 3-O-[-O-D-glucopyranosyl-(1 3)-O--D-glucopyranosyl-(1 6)-O--D-glucopyranosyl-(1 ]-26-O-[-D-glucopyranosyl-(1 ]-25R-furost-5-ene-3,22 , 26-triol.Institute of Chemistry, Academy of Sciences of the Moldavian SSR, Kishinev. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 55–58, January–February, 1976. 相似文献
11.
V. I. Grishkovets D. Yu Sidorov L. A. Yakovishin N. N. Arnautov A. S. Shashkov V. Ya. Chirva 《Chemistry of Natural Compounds》1996,32(3):360-365
From the leaves of Algerian ivyHedera canariensis Willd. (fam. Aralaceae) we have isolated 13 triterpene glycosides: the 3-O--L-arabinopyranosides of oleanolic acid (A), of echinocystic acid (B1), and of hederagenin (B2); the 3-O-[O--L-rhamnopyranosyl-(2)--L-arabinopyranoside]s of oleanolic acid (C), of echinocystic acid (D), and of hederagenin (E1); the 3-O--L-rhamnopyranoside] 28-O-[O--L-rhamnopyranosyl-(14)--gentiobioside of hederagenin (G1); the 3-O-[O--L-rhamnopyranosyl-(12)--L-arabinopyranoside] 28-O--gentiobioside of hederagenin (G3); the 3-O-[O--L-rhamnopyranosyl-(12)--L-arabinopyranoside] 28-O-[O--L-rhamnopyranosyl-(14)--gentiobioside]s of oleanolic acid (G2), of echinocystic acid (H1), and of hederagenin (H2); the 3-O-[O--L-rhanmopyranosyl-(12)--D-glucopyranoside] 28-O-(O--L-rhamno-pyranosyl-(14)--gentiobioside] of hederagenin (H2); and the 3-O-(O--L-rhamnopyranosyl-(12)-O-gentiobiosyl)-O-(14)--L-rhamnopyranosyl-(12)-a-L-arabinopyranoside] of hederagenin (G4). The structures of the substances isolated have been established on the basis of chemical transformations and13C NMR spectroscopy.Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 377–383, May–June, 1996. Original article submitted December 3, 1995. 相似文献
12.
I. A. Sukhina M. A. Agzamova B. A. Imomnazarov M. I. Isaev 《Chemistry of Natural Compounds》2000,36(4):373-376
Cyclosiversigenin 6-O--L-rhamnopyranoside and 6-O--D-glucopyranoside were isolated fromAstragalus coluteocarpusBoiss. (Leguminosae) andAstragalus dissectusB. Fedtsch. et N. Ivanova, respectively. Cyclosiversigenin 5-O--L-rhamnopyranoside was shown to be an artifact forAstragalus coluteocarpus.Thus, the cyclosiversigenin 6-O--D-glucopyranoside that was isolated from certainAstragalusspecies is hypothesized also to be an artifact. Glycosylation of the 6 -hydroxyl group of cycloartanes by D-glucose and D-xylose, in contrast with other substituents, does not change the low-field position of the PMR signal of the 4-CH
3
group (1.65 2.01 ppm) that is caused by the influence of deuteropyridine directly on the 6 -hydroxyl. Obviously one of the hydroxyls of the -D-glucopyranoside or -D-xylopyranoside residues has the same effect in this instance. 相似文献
13.
R. Zh. Karimov V. V. Kachala N. Sh. Ramazanov Z. Saatov A. S. Shashkov 《Chemistry of Natural Compounds》2001,37(6):524-528
Roots of Tragacantha stipulosa Boriss yielded three triterpene glycosides of the cycloartane series: askendoside G (1), askendoside D (2), and cycloglobiceposide B (3). Glycoside 1 is 3-O--L-arabinopyranosyl-(12)--D-xylopyranoside; 16-O--D-glucopyranoside-24R-cycloartan-3,6,16,24,25-pentaol; 2 - 3-O--L-arabinopyranosyl-(12)--D-xylopyranoside; 6-O--D-xylopyranoside-20R,24S-epoxycycloartan-3,6,16,25-tetraol; 3 - 3-O--D-xylopyranoside; 16-O--D-glucopyranoside; 25-O--D-glucopyranoside-24R-cycloartan-3,6,16,24,25-pentaol. 相似文献
14.
A. A. Shashkov V. I. Grishkovets O. Ya. Tsvetkov V. Ya. Chirva 《Chemistry of Natural Compounds》1994,29(4):502-508
The previously known glycosides 3-O--L-arabinopyranosyl-28-O-[-L-rhamnopyranosyl-(14)-O--D-glucopyranosyl-(16)-O--D-glucopyranosyl]hederagenin and 3-O-[-L-rhamnopyranosyl-(12)-O--L-arabinopyranosyl]-28-O-[-L-rhamnopyranosyl-(14)-O--D-glucopyranosyl-(16)-O--D-glucopyranosyl]hederagenin and the new triterpene glycoside tauroside St-H1 — 3-O--D-glucopyransyl-28-O-[-L-rhamnopyranosyl-(14)-O--D-glucopyranosyl-(16)-O--D-glucopyranosyl]hederagenin — have been isolated from the stems ofHedera taurica Carr.M. V. Frunze Simferopol' State University. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 571–579, July–August, 1993. 相似文献
15.
4-O--D-Manopyranosyl-D-mannose, O--D-mannopyranosyl-(l4)-O--D-mannopyranosyl-(14)-D-mannose, and 0--D-mannopyranosyl-(14)-O--D-mannopyranosyl-(l4)-O--D-mannopyranosyl-(l4)-D-mannose have been isolated fron the products of the partial hydrolysis of ungeromannan-V, obtained fron the bulbs ofUngernia vvedneskyi, and have been identified. This set of oligosaccharides confirms the regular structure of the carbohydrate chain of ungeromannan-V, which consists of a linear sequence of -14-bound D-mannose residues.DeceasedTranslated from Khimiya Prirodnykh Soedineii, No. 4, pp. 434–436, July–August, 1981. 相似文献
16.
TheC
v
toC
p
conversion for solid linear macromolecules via the Nernst-Lindemann equationC
p
-C
v
=A
0,C
p
2
T/Tm is discussed on hand of data for 10 crystals and seven glasses. An average value ofA
0=(5.11±2.41) · 10–3 mol K J–1 was calculated if the mole is assumed to refer to heavy atoms only. ThisA
0 is numerically equal to the original Nernst—Lindemann constant.
Support by the National Science Foundation, Polymers Program (Grant No. DMR 83-17097) is gratefully acknowledged. 相似文献
Zusammenfassung An Hand von sich auf 10 Kristalle und 7 Gläser beziehenden Daten wird die Umrechnung vonC v -inC p -Werte für feste lineare Makromoleküle mittels der Nernst-Lindemann-GleichungC p -C v =A 0 C p 2 T/T m diskutiert. Ein Durchschnittswert vonA 0=(5.11±2.41) · 10–3 mol K J–1 wurde unter der Annahme berechnet, daß sich das Mol nur auf schwere Atome bezieht. DieserA 0-Wert ist numerisch gleich der ursprünglichen Nerns-Lindemann-Konstanten.
10 , - C v C p , —C p –C v = 0 p 2 / . , , 0 (5.11±2.41) · 10–3 · –1. 0 — .
Support by the National Science Foundation, Polymers Program (Grant No. DMR 83-17097) is gratefully acknowledged. 相似文献
17.
G. V. Shevchuk Yu. S. Vollerner A. S. Shashkov V. Ya. Chirva 《Chemistry of Natural Compounds》1992,27(5):597-603
Proofs are given of the structures of two new glycosides of the furostan series isolated from the leaves of the plantNolina microscarpa S. Wats. (family Dracaenaceae). Nolinofuroside D is (25S)-furost-5-ene-1,3,22,26-tetraol 1-O--D-galactopyranoside 26-O--D-glucopyranoside (I), and nolinofuroside F is (25S)-furost-5-ene-1,3,22,26-tetraol 1-O--D-fucopyranoside 26-O--D-glucopyranoside 3-O--L-rhamnopyranoside (VII). The latter was characterized as its 22-O-methyl ether (VIII). Nolinofuroside E (IV) has the structure of (25S)-furost-5-ene-1,3,22,26-tetraol 26-O--glucopyranoside 1-O-[O--L-rhamnopyranosyl-(12)--D-fucopyranoside], which followed from the structure of the fermentation product (VI). The products of the fermentation of the above-named compounds were present in the plant in only trace amounts. Only one of them — nolinospiroside D (III) — has not been described previously. This monoside of the spirostan series is (25S)-spirost-5-ene-1,3-diol 1-O--D-galactopyranoside.M. V. Frunze Simferopol' State University. Institute of Chemistry of Plant Substances, Uzbek Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 678–686, September–October, 1991. 相似文献
18.
P. Fejes H. Förster I. Kiricsi J. Seebode 《Reaction Kinetics and Catalysis Letters》1982,20(3-4):241-247
Harmonic frequencies, anharmonicities and dissociation energies of surface hydroxy groups in H-mordenite have been determined. The application of the Lippincott-Schroeder potential function for similar problems is proposed.
, -. - .相似文献
19.
The principle of an apparatus using an isothermal continuous flow stirred tank reactor to study homogeneous gas phase reactions at space times of the order of 1 sec is given. With this apparatus, the induction period of neopentane pyrolysis (as an example) has been clearly shown.
, , 1 . , , .相似文献
20.
S. Podsiadło 《Journal of Thermal Analysis and Calorimetry》1987,32(3):771-775
The formation of a previously unknown compound with stoichiometry Li6SiN2O2 was found during studies on the reactivity of Li2SiN2 with Li2O, of SiO2 with Li3N and of Li3SiNO2 with Li3N.
Zusammenfassung Die Bildung einer bisher unbekannten Verbindung der Stöchiometrie Li6SiN2O2 wurde bei Untersuchungen der Reaktivität von Li2SiN2 mit LiO, von SiO2 mit Li3N und von Li3SiNO2 mit Li3N beobachtet.
Li6SiN2O2 Li2SiN2 , , Li3SiNO2 .相似文献