scholarly journals The structure of fusarochromanone: new mycotoxin from Fusariumroseum, "Graminearum"

1986 ◽  
Vol 64 (7) ◽  
pp. 1258-1261 ◽  
Author(s):  
Sadanand V. Pathre ◽  
William B. Gleason ◽  
Yin-Wan Lee ◽  
Chester J. Mirocha
Keyword(s):  
Single Crystal ◽  
Spectroscopic Data ◽  
Ring Structure ◽  
Toxic Principle ◽  
X Ray ◽  
Tibial Dyschondroplasia ◽  
Toxic Cultures

An isolate of Fusariumroseum "Graminearum" obtained from overwintered oats in Alaska produced toxic cultures when grown on rice. The toxic principle called fusarochromanone isolated from these cultures reproduced the signs of tibial dyschondroplasia in poultry and also reduced hatchability of fertile eggs. Spectroscopic data (nmr, ir, and ms) indicated the mycotoxin to be a chromanone derivative. The chromanone ring structure was also confirmed by single crystal X-ray.

New iboga-type alkaloids from Ervatamia hainanensis

RSC Advances ◽  
2016 ◽  
Vol 6 (36) ◽  
pp. 30277-30284 ◽  
Author(s):  
Zhi-Wen Liu ◽  
Xiao-Jun Huang ◽  
Han-Lin Xiao ◽  
Guo Liu ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Spectroscopic Data ◽  
X Ray Diffraction ◽  
X Ray

The structures and absolute configurations of seven new iboga-type alkaloids 1–7 were determined by spectroscopic data, Mosher's method, single crystal X-ray diffraction and ECD analyses.

Studies of Australian soft corals. IX. A novel nor-diterpene from the soft coral Sinularia leptoclados

1978 ◽  
Vol 31 (9) ◽  
pp. 2049 ◽  
Author(s):  
BF Bowden ◽  
JC Coll ◽  
SJ Mitchell ◽  
J Mulder ◽  
GJ Stokie
Keyword(s):  
Single Crystal ◽  
Spectroscopic Data ◽  
Soft Coral ◽  
Parent Compound ◽  
Soft Corals ◽  
X Ray

The structure of a novel nor-cembranoid diterpene of formula C19H24O6 (1) is reported. The compound was extracted from the soft coral Sinularia leptoclados, and spectroscopic data were collected on the parent compound (1) and a series of derivatives. It was not possible to assign an unambiguous structure on purely spectroscopic grounds, and so single-crystal X-ray analysis was used to prove the structure (1): (4R*,8S*,11R*,13S*,14R*)-14-hydroxy-4-isopropenyl-11-methyl-6,9-dioxo-8,11-epoxycyclotetradec-1-ene-1,13-carbolactone.

Gold(I)-Bis(diphenylphosphino)amid und einige Gold(I)-Bis(diarylphosphino)methanide mit sterisch anspruchsvollen Arylsubstituenten / Gold(I)-bis(diphenylphosphino)amide and Some Gold(I)-bis(diarylphosphino)methanides with Bulkyl Aryl Substituents

1983 ◽  
Vol 38 (1) ◽  
pp. 62-66 ◽  
Author(s):  
Hubert Schmidbaur ◽  
Stefan Schnatterer ◽  
Kailash C. Dash ◽  
Aref A. M. Aly
Keyword(s):  
Spectroscopic Data ◽  
Ring Structure ◽  
Mossbauer Spectrum ◽  
X Ray Diffraction ◽  
Mössbauer Spectrum ◽  
X Ray ◽  
Molar Ratios ◽  
Tertiary Phosphines ◽  
Deep Yellow

Intensely yellow coloured, insoluble gold(I)-bis(diarylphosphino)amides, [(C6H5)P2NAu, 1, is obtained from lithiated bis(diphenylphosphino)amine and AuCl complexes of tertiary phosphines. 1 is assigned a dimeric eightmembered ring structure on the basis of its 197Au-Mößbauer spectrum and of a direct analogy with the corresponding bis(phosphino)methanide complexes, whose structure has recently been confirmed by X-ray diffraction. A series of mono- and binuclear AuCl complexes of bis(diarylphosphino)methanes bearing bulky 2-tolyl or 2,6-dimethylphenyl substituents (3a, b) was synthesized from the diphosphines and (CO)AuCl in the molar ratios 1:2 or 1:1. The compounds have structures 4 a, b and oa, b, respectively. An ionic tetrafluoroborate derivative 6 b was obtained from the chloride 5 b on treatment with AgBF4. Lithiation of the diphosphinomethanes 3 a, b using LiCH3 followed by reaction with CIAuPR3 complexes yields the deep-yellow Au(I) bis(diarylphosphino)methanides 7 a, b. All compounds, including the new ligand 3b and its precursor (2,6-(CH3)2C6H3)2PBr, 2, were characterized by analytical and spectroscopic data.

New quinolinone alkaloids from the heartwood of, Euxylophora paraensis

1981 ◽  
Vol 34 (8) ◽  
pp. 1625 ◽  
Author(s):  
L Jurd ◽  
RY Wong
Keyword(s):  
Single Crystal ◽  
Spectroscopic Data ◽  
X Ray Diffraction ◽  
X Ray

The heartwood of Euxylophora paraensis Hub. (Rutaceae) has given N-methylflindersine (2),spectabiline (3), skimmianine (4) and two new alkaloids, identified from spectroscopic data as 4-hydroxy-2,2,6-trimethyl-3,4,5,6-tetrahydro-2H-pyrano[3,2-c]quinolin-5-one (5) and 4-(2,3-dihydroxy-3-methylbutoxy)-1-methylquinolin-2(1H)-one (6). Five new dimeric quinolinone alkaloids, C30H30N2O4, were isolated. The structure of one of these, paraensidimerin D, has now been shown by single-crystal X-ray diffraction methods to be (11), viz. (6aα,7α,14aα)-6,6,9,16- tetramethyl-7-(2-methylprop-1-enyl)-6,6a,7,9,14a,16-hexahydro-8H,15H- quino[3'',4'':5',6'] pyrano [2',3':4,5] pyrano-[3,2-c]quinoline-8,15- dione.

scholarly journals ISOLATION AND STRUCTURAL ELUCIDATION OF A NEW DEPSIDE OF LICHEN Everniopsis trulla

2021 ◽  
Vol 87 (2) ◽  
pp. 97-106
Author(s):  
Olivio Nino Castro ◽  
Jesús López Rodilla ◽  
Sofia Pombal ◽  
Francisca Sanz González ◽  
Julio Santiago Contreras
Keyword(s):  
Mass Spectrometry ◽  
Melting Point ◽  
Hydrogen Bonds ◽  
Single Crystal ◽  
Spectroscopic Data ◽  
Intermolecular Forces ◽  
X Ray Diffraction ◽  
Intermolecular Hydrogen Bonds ◽  
X Ray ◽  
Uv Visible

In this research, a new depside of the lichen Everniopsis trulla has been isolated. The extraction was carried out to 400 g of dry sample and ground with ethanol for 3 repetitions, then, it was fractionated by applying column chromatography with the CHCl3-MeOH system and purified by recrystallization with MeOH-Acetone (1: 1); Finally, white crystals in the form of needles (solid C) with a melting point of 198 ° C were obtained, whose structure was elucidated based on spectroscopic data (UV-Visible, IR, NMR-H1, NMR-C13, mass spectrometry and single crystal X-ray diffraction). According to the Science Finder databases, it is a new depside, called trullarin, and it is observed that molecular packing is influenced by both intramolecular and intermolecular forces. Intermolecular hydrogen bonds of O - H -O type binds neighboring molecules forming dimers.

scholarly journals Secondary Metabolites with α-Glucosidase Inhibitory Activity from the Mangrove Fungus Mycosphaerella sp. SYSU-DZG01

Marine Drugs ◽  
2019 ◽  
Vol 17 (8) ◽  
pp. 483 ◽  
Author(s):  
Pei Qiu ◽  
Zhaoming Liu ◽  
Yan Chen ◽  
Runlin Cai ◽  
Guangying Chen ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Secondary Metabolites ◽  
Single Crystal ◽  
Absolute Configuration ◽  
Inhibitory Activity ◽  
Spectroscopic Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ic50 Values ◽  
New Metabolites

Four new metabolites, asperchalasine I (1), dibefurin B (2) and two epicoccine derivatives (3 and 4), together with seven known compounds (5–11) were isolated from a mangrove fungus Mycosphaerella sp. SYSU-DZG01. The structures of compounds 1–4 were established from extensive spectroscopic data and HRESIMS analysis. The absolute configuration of 1 was deduced by comparison of ECD data with that of a known structure. The stereostructures of 2–4 were further confirmed by single-crystal X-ray diffraction. Compounds 1, 8 and 9 exhibited significant α-glucosidase inhibitory activity with IC50 values of 17.1, 26.7 and 15.7 μM, respectively. Compounds 1, 4, 6 and 8 showed antioxidant activity by scavenging DPPH· with EC50 values ranging from 16.3 to 85.8 μM.

scholarly journals Anti-inflammatory Anthraquinones from the Crinoid Himerometra magnipinna

2015 ◽  
Vol 10 (2) ◽  
pp. 1934578X1501000
Author(s):  
Yen-You Lin ◽  
Su-June Tsai ◽  
Michael Y. Chiang ◽  
Zhi-Hong Wen ◽  
Jui-Hsin Su
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
Absolute Configuration ◽  
Spectroscopic Data ◽  
Test Compound ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anti Inflammatory ◽  
Raw264.7 Macrophage

Chemical investigation of a crinoid Himerometra magnipinna has afforded three anthraquinones (1–3), including one new metabolite, (+)-rhodoptilometrin (1). The structures of these compounds were elucidated on the basis of their spectroscopic data and the absolute configuration of 1 was further confirmed by single-crystal X-ray diffraction analysis. In the in vitro anti-inflammatory effects test, compound 2 was found to significantly inhibit the accumulation of the pro-inflammatory iNOS protein of the LPS-stimulated RAW264.7 macrophage cells.

Studies in the Cycloproparene Series: Formation of a New Dimer of 1H-Cyclopropa[b]naphthalene

1999 ◽  
Vol 52 (4) ◽  
pp. 285 ◽  
Author(s):  
Brian Halton ◽  
Carissa S. Jones ◽  
Peter T. Northcote ◽  
Roland Boese
Keyword(s):  
Single Crystal ◽  
Spectroscopic Data ◽  
Size Exclusion ◽  
The Novel ◽  
Methyl Derivative ◽  
X Ray ◽  
Pure Compounds

1-(Trimethylsilyl)-1H-cyclopropa[b]naphthalene (10) and its 1-methyl derivative (11) have been isolated as pure compounds from use of a lipophilic size exclusion gel. Acylation of the 1H-cyclopropa[b]naphthalenyl anion (2) is effected with N,N -dimethyl-benzamide and -acetamide to give (5) and (6), respectively. Analogous reactions with the 1-(trimethylsilyl)-1H-cyclopropa[b]naphthalenyl anion (9) do not yield the 1-acyl-1-(trimethylsilyl)-1H-cyclopropa[b]naphthalenes (12) and (13); instead the novel 6-methyl- 7H-dibenzo[b,g]fluorene (15) results from attempted acetylation. Compound (15), a formal dimer of 1H-cyclopropa[b]naphthalene (1), is formed also from anion (9) both in toluene and from addition of hydrocarbon (1); its structure is assigned from spectroscopic data and confirmed by single-crystal X-ray analysis.

scholarly journals X-ray structure of hexamethyl benzenehexacarboxylate, [C6(COOCH3)6]

1970 ◽  
Vol 34 (2) ◽  
pp. 197-200
Author(s):  
Shishir Ghosh ◽  
Md Kamal Hossain ◽  
Shariff E Kabir ◽  
Noorjahan Begum
Keyword(s):  
Thermal Treatment ◽  
Single Crystal ◽  
Diffraction Study ◽  
Key Words ◽  
Spectroscopic Data ◽  
Monoclinic Space Group ◽  
Dimethyl Acetylenedicarboxylate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Academy Of Sciences

The thermal treatment of [Ru2(CO)6(μ-η1,η2-C4H3O){μ-P(C4H3O)2}] 1 with dimethyl acetylenedicarboxylate (DMAD) at 110 °C leads to cyclotrimerization of DMAD. The cyclotrimerization product hexamethyl benzenehexacarboxylate, [C6(COOCH3)6] 2, was obtained in 37% yield and characterized by a combination of spectroscopic data and single crystal X-ray diffraction study. Compound 2 crystallizes in the monoclinic space group P1bar with a = 10.3002(12), b = 11.0371(13), c = 18.781(2) Å, α = 76.148(2), β = 87.390(2), γ = 74.001(2)°, Z = 4 and V = 1992.2(4) Å3. Key words: Cyclotrimerization; Dimethyl acetylenedicarboxylate; X-ray structure DOI: 10.3329/jbas.v34i2.6866Journal of Bangladesh Academy of Sciences, Vol. 34, No. 2, 197-200, 2010

Übergangsmetall-substituierte Diphosphene, XXVI Zum Einfluß des Ringliganden auf Bildungstendenz und Stabilität von Diphosphenyleisenkomplexen des Typs (η5-C5R5)(CO)2Fe-P= P-Mes (Mes = 2,4,6-tBu3C6H2). Röntgenstrukturanalyse von (η5-C5Me4Et)(CO)2Fe-P(SiMe3)2 / Transition Metal Substituted Diphosphenes, XXVI Investigations on the Influence of the Ring Ligand upon Formation and Stability of Diphosphenyl Complexes (η5-C5R5)(CO)2Fe-P=P-Mes (Mes = 2,4,6-tBu3C6H2). X-Ray Analysis of (η5-C5Me4Et)(CO)2Fe-P(SiMe3)2

1992 ◽  
Vol 47 (8) ◽  
pp. 1134-1140 ◽  
Author(s):  
Lothar Weber ◽  
Iris Schumann ◽  
Hans-Georg Stammler ◽  
Beate Neumann
Keyword(s):  
Molecular Structure ◽  
Transition Metal ◽  
Single Crystal ◽  
Elemental Analysis ◽  
Spectroscopic Data ◽  
Iron Complexes ◽  
X Ray

The disilylphosphido iron complexes (η5-C5R5)(CO)2Fe-P(SiMe3)2 (1b–d) result from the reaction of the corresponding bromo compounds (η5-C5R5)(CO)2FeBr with LiP(SiMe3)2 · 2 THF. The complexes 2b–d are cleanly converted into the diphosphenyl complexes (η5-C5R5)(CO)2Fe-P=P-Mes* (2b–d) by treatment with equimolar amounts of Mes*PCl2. The products 1b–d and 2b–d have been characterized by elemental analysis as well as spectroscopic data (IR, 1H, 13C, 31P NMR, MS). The molecular structure of η5-C5Me4Et)(CO)2Fe-P(SiMe3)2 (1b) has been established by single-crystal X-ray analysis.

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