共查询到20条相似文献,搜索用时 999 毫秒
1.
S. Muthukumaru Pillai 《Reaction Kinetics and Catalysis Letters》1994,52(1):35-41
The isomerization of 5-vinyl-2-norbornene (1) has been studied in the presence of Co (R1-COCHCOR2)x–Et6–yAl2Cly (x=2, 3; y=2–4) catalytic systems. Co(acac)2–AlEt3 and Co(acac)3–AlEt3 systems isomerize1 to 5-ethylidene-2-norbornene (2), whereas the Co(PhCOCHCOPh)2–AlEt3 system selectively forms 3-vinylnortricyclene (3).2 is always accompanied by formation of ethylidene norbornane (4). A possible mechanism for formation of products is proposed. 相似文献
2.
Summary The leaves ofFraxinus mandschurica Rupr. and the bark ofF. potamophila Herd. have yielded esculetin, fraxinol, and a new coumarin C10H8O5, mp 228–230°C which we have called isofraxetin. On the basis of NMR and UV spectroscopy it has been established that isofraxetin is 5,7-dihydroxy-7-methoxycoumarin.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR. Institute of Chemistry, Academy of Sciences of the Turkmen SSR. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 493–497, July–August, 1973. 相似文献
3.
Conclusions From the racemes ofC. xanthifolia Fresen. have been isolated a sesquiterpene lactone C16H20O4, the structural (+)-isomer of (–)-coronopilin, which has not been studied previously; structure I has been proposed for it.Khimiya Prirodnykh Soedinenii, Vol. 5, No. 5, pp. 375–377, 1969 相似文献
4.
Summary From an acetonic extract of the roots ofFerula samarcandica Kor. have been isolated farnesiferol A, gummosin, and two new coumarin substances, samarcandin C24H30–32O5 and samarcandone C24H28–30O5. Samarcandin has been converted into samarcandone and their probable structures-I and II-have been established.Khimiya Prirodnykh Soedinenii, Vol. 4, No. 2, pp. 73–77, 1968 相似文献
5.
Summary 1. The polarographic behavior of haploperine, haplopine, haplophyllidine, and perforine in Britton-Robinson buffer solutions and in (C2H5)4NOH solutions has been studied. Optimum conditions for their quantitative determination in solutions within the range of concentrations from 5×10–4 to 1×10–2 M have been found.2. A method for the separate quantitative determination of the alkaloids in the seeds ofH. perforatum has been developed.Khimiya Prirodnykh Soedinenii, Vol. 2, No. 5, pp. 333–337, 1966 相似文献
6.
S. V. Serkerov 《Chemistry of Natural Compounds》1972,5(5):314-316
Conclusions From the resin of the roots ofFerula oopoda (Boiss. et Buhse) Boiss. a new sesquiterpene lactone C20H26O4, mp 127–128° C, has been isolated which has been given the name oopodin. The probable structure I has been proposed for oopodin.Khimiya Prirodnykh Soedinenii, Vol. 5, No. 5, pp. 378–381, 1969 相似文献
7.
Conclusions A new anthraglycoside with the composition C26H28O14 and mp 210–212°C, lucidin primeveroside, has been isolated from the roots ofRubia iberica C. Koch.Khimiya Prirodnykh Soedinenii, Vol. 4, No. 5, pp. 273–277, 1968 相似文献
8.
Summary From the neutral fraction of an acetone extract of the roots of plants of the genusFerula,F. gummosa Boiss.,F. pseudoreoselinum Rgl. et Schmalh. (K-Pol.) andF. Samarkandica Eug. Kor., we have isolated a coumarin gummosin with the composition C24H30O4, mp 176–177°C, [a]D –54°C. The structure of gummosin corresponds to formula (III).With respect to structure, gummosin is a spatial isomer of farnesiferol A; it differs from the latter by the fact that the secondary OH group in gummosin is axial.Khimiya Prirodynkh Soedinenii, Vol. 2, No. 6, pp. 383–387, 1966 相似文献
9.
The composition of the fatty mono- and dihydroxy acids of the fruit ofRumex paulsenianus Rech. fil. (familyPolygonaceae) has been determined by a combination of IRS, UVS, GLC, and mass-spectrometric methods. (22) Monohydroxy acids of the C14–C20 series, including isomers and isologues, and four dihydroxy acids from C18 to C20, including a new isomeric 9-OH-10, 12–17:2 acid have been detected.Institute of the Chemistry of Plant Substances, Uzbek Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 762–765, November–December, 1991. 相似文献
10.
K. S. Rybalko O. A. Konovalova V. I. Sheichenko P. I. Zakharov 《Chemistry of Natural Compounds》1977,12(3):262-265
Summary From the epigeal part ofArtemisia armeniaca Lam, we have isolated the new coumarin armin with the composition C14H16O5 and have proposed structure (I) for it.All-Union Scientific-Research Institute of Medicinal Plants, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 294–298, May–June, 1976. 相似文献
11.
M. R. Nurmukhamedova Sh. Z. Kasymov N. D. Abdullaev G. P. Sidyakin 《Chemistry of Natural Compounds》1985,21(3):313-314
A chloroform extract of the seeds ofFerula penninervis Rgl et Schmahl has yielded a new sesquiterpene lactone of the guaiane type — fegolide: C20H28O5, mp 165–166°C []D –150°C (c 0.17; chloroform).Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 335–337, May–June, 1985. 相似文献
12.
Summary 1. Column and thin-layer chromatography have been used to analyze the metabolite composition of the culture liquid ofFusarium moniliforme.
2. On fermentation in a medium containing sunflower oil and ammonium nitrate, the content of gibberellins of the A3-A1 group was 650–680 mg/l, of the gibberellins of the A4-A7 group 85–90 mg/l, and of gibberellin A9 about 5 mg/l.Khimiya Prirodnykh Soedinenii, Vol. 2, No. 1, pp. 55–58, 1966 相似文献
13.
S. V. Serkerov 《Chemistry of Natural Compounds》1972,5(4):208-209
Conclusions From the resin of the roots ofFerula oopoda (Boiss. et Buhse) Boiss. a new sesquiterpene lactone, feropodin, with the composition C15H20O2, mp 140–141° C, has been isolated. The alternative hypothetical structures I and II have been proposed for feropodin.Khimiya Prirodnykh Soedinenii, Vol. 5, No. 4, pp. 245–247, 1969 相似文献
14.
M. Berdieva V. K. Burichenko A. B. Zegel'man V. A. Shibnev 《Chemistry of Natural Compounds》1974,8(2):212-215
Summary From the herbGlaucium flavum have been isolated O-methylatheroline, sinoacutine, and a new alkaloid of the aporphine series, C20H17NO5, which has been called glauvine.A structural formula has been proposed for glauvine on the basis of chemical reactions and spectral information.All-Union Scientific-Research Institute of Medicinal Plants. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 214–218, March–April, 1972. 相似文献
15.
Summary A new Coumarin C19H20O5, designated xanthogalin, has been isolated from the roots ofXanthogalum purpurascens. It is an ester of a new hydroxycoumarin, xanthogalol C14H14O4, andtrans-1, 2-dimethylacrylic (angelic) acid.Khimiya Prirodnykh Soedinenii, Vol. 1, No. 2, pp. 139–142 相似文献
16.
A. Z. Abyshev 《Chemistry of Natural Compounds》1971,5(1):1-2
Conclusions From the roots ofPrangos ferulacea (L.) Lindl. growing in Armenia an optically inactive furocoumarin C16H16O5, an isomer of pranferol, has been isolated.Khimiya Prirodnykh Soedinenii, Vol. 5, No. 1, pp. 3–5, 1969 相似文献
17.
A. M. Khashimov L. S. Smirnova S. F. Matkhalikova S. Yu. Yunusov 《Chemistry of Natural Compounds》1971,4(6):310-312
Conclusions 1. In the extraction ofS. salsa andS. elegans, the condensation of the neutral substances with ammonia takes place with the formation of products of a basic nature.2. FromS. elegans a new alkaloid elegantine C23H29O5N has been obtained the saponification of which has given tyramine and a sesquiterpene lactone.Khimiya Prirodnykh Soedinenii, Vol. 4, No. 6, pp. 367–370, 1968 相似文献
18.
Summary A new anthraquinone of composition C17H14O5, mp 182–183° (decomp., from benzene) has been isolated from the roots ofRubia iberica (Fisch. ex D.C.); it has been called ibericin and has the structure of 1, 3-dihydroxy-4-ethoxy-methylanthraquinone.Khimiya Prirodnykh Soedinenii, Vol. 2, No. 1, pp. 12–15, 1966 相似文献
19.
Isao Hasegawa 《Journal of Sol-Gel Science and Technology》1994,2(1-3):127-130
29Si NMR peaks due to species with the double four-membered ring siloxane backbone composed of both Si(O–)4/2 and CH3Si(O–)3/2 units, (CH3)
n
Si8O
20 – n
/(8 – n) –
(n=1–3), formed by co-hydrolysis of tetraethoxysilane and methyltriethoxysilane in the presence of tetramethylammonium ions in methanol have been assigned. It has been found that 29Si NMR peaks due to Si(OSi)3(O–) units shift to lower frequencies by replacement of the adjacent Si(O–)4/2 units by CH3Si(O–)3/2 units, in other words, with increasing m value in Si[OSi(O–)3]3 – m
[OSi(CH3) (O–)2]
m
(O–) (m=0–2). Peaks from CH3
Si(OSi)3 units in the species have also appeared as separated due to the kind of neighbor structural units. On the basis of the assignments, positions of CH3Si(O–)3/2 units in the cubic octameric siloxane framework of (CH3)
n
Si8O
20 – n
/(8 – n) –
(n=2, 3), for both of which three isomers are present, have been estimated. 相似文献
20.
Conclusions FromGentiana olgae have been isolated gentiananine, gentianadine, and the new base gentianaine C6H7O3N. The structural formula for the latter has been given.G. caucasica contains gentianine and gentiananine; andG. kaufmanniana contains gentianine, gentianaine, and gentiananine; gentianaine has been found in the mother liquors fromG. turkestanorum andG. olivieri.Khimiya Prirodnykh Soedinenii, Vol. 5, No. 1, pp. 32–36, 1969 相似文献