scholarly journals New Diterpenoids of Sigesbeckia pubescens (Makino) Makino

2021 ◽  
Vol 12 (6) ◽  
pp. 8035-8041
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Column Chromatography ◽  
Aerial Parts ◽  
New Compounds

The composition of diterpenoids isolated from the aerial parts of Sigesbeckia pubescens growing in Primorsky Territory was investigated. Diterpenoids -glucopyranosyl-18-acetoxy-16, 17-dihydroxykauran-19-oate (1), 15-O-malonylkirenol (2), and 16-O-malonylkirenol (3) were isolated by extraction and preparative column chromatography. The diterpenoids 1-3 were new compounds, the structures of which were established using NMR spectroscopy and mass spectrometry.

Chemie polyfunktioneller Liganden, 69 [1] Über drei Organo-Arsen-Käfigverbindungen mit Noradamantanstruktur / Chemistry of Polyfunctional Ligands, 69 [1] Three Organo-Arsenic Cage Compounds with Noradamantane Structure

1981 ◽  
Vol 36 (12) ◽  
pp. 1532-1537 ◽  
Author(s):  
Jochen Ellermann ◽  
Martin Lietz
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Cage Compounds ◽  
H Nmr ◽  
New Compounds

Abstract The reaction of l.l.l-tris(diiodarsinomethyl)ethane, CH3C(CH2Asl2)3 (1), with H2C(COOC2H5)2, H2C(COOCH3)2 and H2C(COC6H5)2 in presence of the auxiliary base (C2H5)3N gives the noradamantane structured compounds CH3C(CH2As)3E2 [E=C(COOC2H 5)2 (2), C(COOCH3)2 (3) and C(COC6H5)2 (4)].The new compounds have been characterized by mass spectrometry and infrared, Raman and 1H NMR spectroscopy.

scholarly journals Ionone, Iridoid and Phenylethanoid Glycosides from Ajuga salicifolia

2003 ◽  
Vol 58 (3-4) ◽  
pp. 177-180 ◽  
Author(s):  
Pınar Akbay ◽  
İhsan Çalιş ◽  
Jörg Heilmann ◽  
Otto Sticher
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
2D Nmr ◽  
Maldi Mass Spectrometry ◽  
Phenylethanoid Glycosides ◽  
2D Nmr Spectroscopy ◽  
First Report ◽  
Aerial Parts ◽  
First Time

From the aerial parts of Ajuga salicifolia (L.) Schreber, a new ionone glycoside (3β-hydroxy- 7,8-dihydro-4-oxo-β-ionol-9-O-β-ᴅ-glucopyranoside) was isolated, along with the known compounds, corchoionoside C, 8-O-acetylmioporoside, ajugol, harpagide, 8-O-acetylharpagide, lavandulifolioside and leonosides A and B. This is the first report of the occurrence of ionone glycosides and 8-O-acetylmioporoside in Ajuga species. Ajugol, lavandulifolioside, leonoside A and B were isolated for the first time from Ajuga salicifolia. The structures were elucidated by means of 1D-, 2D-NMR spectroscopy, and HR-MALDI mass spectrometry.

Lignans, Phenylpropanoids and Polyacetylenes from Chaerophyllum aureum L. (Apiaceae)

2003 ◽  
Vol 58 (7-8) ◽  
pp. 553-557 ◽  
Author(s):  
Judith M. Rollinger ◽  
Christian Zidorn ◽  
Michael J. Dobner ◽  
Ernst P. Ellmerer ◽  
Hermann Stuppner
Keyword(s):  
Mass Spectrometry ◽  
Antimicrobial Activity ◽  
Nmr Spectroscopy ◽  
Plant Material ◽  
High Resolution Mass Spectrometry ◽  
Active Principle ◽  
Aerial Parts ◽  
Tlc Plates ◽  
First Time ◽  
Resolution Mass

Abstract Sub-aerial parts of Chaerophyllum aureum L. yielded two polyacetylenes, falcarinol (1), falcarindiol (2), three lignans, namely nemerosin (3), deoxypodorhizone (4), deoxypodo-phyllotoxin (5), two phenylpropanoids, 1′-hydroxymyristicin (6) and its angeloyl ester (7). Compounds 6 and 7 were isolated for the first time from plant material and their structures were elucidated by means of extensive 1- and 2-dimensional NMR spectroscopy and high resolution mass spectrometry. In bioautographic tests on TLC plates the dichloromethane extract showed a significant antimicrobial activity. Falcarindiol was identified as the main active principle whereas the phenylpropanoids and lignans showed no activity.

Syntheses and Characterization of 1-Haloazagermatranes

2001 ◽  
Vol 56 (2) ◽  
pp. 137-140 ◽  
Author(s):  
Pavel L. Shutov ◽  
Sergey S. Karlov ◽  
Jörg Lorberth ◽  
Galina S. Zaitseva
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Molecular Composition ◽  
High Yield ◽  
Elemental Analyses ◽  
New Compounds ◽  
C Nmr

Abstract Germanium, Azagermatranes The reaction of tris(dimethylamino)halogermanes, (Me2N)3GeHal (7, Hal = Cl; 8 , Hal = Br), with tris(2-aminoethyl)amines, N(CH2CH2NHR)3 (5, R = H; 6 , R = Me), yield l-halo-N,N',N"-azagermatranes (1, X = Cl, R = H; 2, X = Br, R = H; 3, X = Cl, R = Me; 4, X = Br, R = Me). Treatment of 4 with n-butyllithium affords l-n-butyl-N,N',N"-trimethylazagermatrane (14) in high yield. Reactions of n-BuLi with 7 or (Me2N)4Ge (13) lead to the formation of (Me2N)3Ge-n-Bu (15). On treatment of 15 with 5 the 1 -n-butylazagermatrane 16 was obtained. The molecular composition and the structures of all new compounds were established by elemental analyses, 1H and 13C NMR spectroscopy and mass spectrometry.

Syntheses, Solid State Structures and Photochemistry of α,ω-Bis-[(1,8-dichloroanthracen-10-yl)dimethylsilyl]alkanes

Synthesis ◽  
2018 ◽  
Vol 50 (15) ◽  
pp. 3041-3047 ◽  
Author(s):  
Norbert Mitzel ◽  
Philipp Niermeier ◽  
Jan-Hendrik Lamm ◽  
Marvin Linnemannstöns ◽  
Beate Neumann ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Uv Light ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anthracene Derivatives ◽  
Elimination Reactions ◽  
New Compounds ◽  
Solid State Structures

Starting from 10-bromo-1,8-dichloroanthracene, a series of 1,8-dichlorinated anthracene derivatives, flexibly bridged in position 10 by –Me2Si– and –Me2Si–(CH2) n –SiMe2– linker units, were synthesised. The linked anthracenes were generated by converting (1,8-dichloroanthracen-10-yl)lithium with chlorosilanes in salt-elimination reactions. The bichromophors were tested in UV light induced photo reactions. None of the new compounds yielded any intra- or intermolecular photoproduct. All α,ω-(dimethylsilyl)alkane-linked bisanthracenes decomposed to give 1,8-dichloro-9-hydroxyanthracen-10(9H)-one in the presence of oxygen. A completely different behaviour was shown by the bisanthracenyldimethylsilane, undergoing a 9,10:3′,4′-photocyclomerisation reaction. The new compounds were characterised by NMR spectroscopy, mass spectrometry and in most cases by X-ray diffraction studies.

Synthesis and Structural Characterization of Metal Complexes of 2-Formylpyrrole 4N-Methylthiosemicarbazone (4ML1) and 2-Acetyl- pyrrole 4N-Methylthiosemicarbazone (4ML2). The X-Ray Crystal Structures of [Ni(4ML1-H)2], [Pd(4ML1-H)2] and [Cd(4ML2)2I2]

2001 ◽  
Vol 56 (3) ◽  
pp. 219-228 ◽  
Author(s):  
Ruben Alonso ◽  
Elena Bermejo ◽  
Rosa Carballo ◽  
Alfonso astiñeiras ◽  
Teresa Pérez
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Elemental Analysis ◽  
Structural Characterization ◽  
X Ray ◽  
Group 12 ◽  
New Compounds ◽  
Group 10 Metals ◽  
C Nmr

Abstract Reaction of 4N-methyl-2-[1-(pyrrol-2-yl)methylidene]hydrazinecarbothioamide (4ML1 and 4N-methyl-2-[1-(pyrrol-2-yl)-ethylidene]hydrazine carbothioamide (4ML1) with zinc(II), cadmium(II) and mercury(II) halides afforded complexes with formulas [M(L)X2] [(L; M; X) =(4ML1; Cd; Cl) (4), (4ML1; Hg; Cl, Br, I) (7 - 9), (4ML2; Cd; Cl) (17), (4ML2; Hg; Cl, Br, I) (20 - 22)] or [M(L)2X2] [(L; M; X) = (4ML1; Zn; Cl, Br, I) (1 - 3), (4ML1; Cd; Br, I) (5, 6), (4ML2; Zn; Cl, Br, I) (14 - 16), (4ML2; Cd; Br, I) (18, 19)]. Reaction of 4ML1 with salts of copper(II), nickel(II), palladium(II) and platinum(II) afforded complexes of formula [M(4ML1-H)2] (10 -13). Crystals of 11, 12 and 19 were studied by X-ray diffractometry, and all new compounds were characterized by elemental analysis, mass spectrometry, and IR, electronic and 1H and 13C NMR spectroscopy and, when pertinent and allowed by the solubility of the compound, 113Cd or 199Hg NMR spectroscopy. In the complexes of Group 12 metals, both ligands are neutral and S-monodentate. In the complexes of copper or Group 10 metals, 4ML1 is monodeprotonated and S,N-bidentate.

Selective Reduction of Peptidic Ergot Alkaloids

2000 ◽  
Vol 65 (11) ◽  
pp. 1762-1776 ◽  
Author(s):  
Ladislav Cvak ◽  
Josef Stuchlík ◽  
Magdalena Schreiberová ◽  
Petr Sedmera ◽  
Vladimír Havlíček ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Ergot Alkaloids ◽  
Selective Reduction ◽  
Lithium Aluminium Hydride ◽  
Lithium Aluminium ◽  
New Compounds ◽  
Representative Member

Five 6'-deoxoergopeptines were prepared in 51-68% yield by selective reduction of parent alkaloids with lithium aluminium hydride in tetrahydrofuran at low temperature. New compounds were characterized by mass spectrometry and NMR spectroscopy. The conformation of the peptide part in starting compounds and reduced derivatives is discussed on the basis of crystal structure determination of 6'-deoxo-9,10-dihydroergotamine dihydrate butan-2-one solvate as a representative member of the series.

N-alkyl-2-(1,2-diferrocenylvinyl)-4,5-dihydrooxazolinium salts, multi-component synthesis and breaking of their heterocyclic systems

2016 ◽  
Vol 88 (12) ◽  
pp. 1129-1142 ◽  
Author(s):  
Jessica J. Sánchez García ◽  
Marcos Flores-Alamo ◽  
Mark E. Martínez Klimov ◽  
Elena I. Klimova
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Elemental Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alkyl Iodides ◽  
New Compounds ◽  
C Nmr

AbstractA new multicomponent method for the synthesis of N-alkyl-2-(Z-1,2-diferrocenylvinyl)-4,5-dihydrooxazolinium salts 3a–f, 5-(N-alkyl-2′,3′-diferrocenyl-acryloylamido)-3-aza-3-alkylpentanols 4a–d, (E)-N-alkyl-N-(2-morpholinoethyl)-2,3-diferrocenylacrylamides 9a,b,e,f and (E)-N-alkyl-N-(2-piperidinoethyl)-2,3-diferrocenylacrylamides 10a,c from reactions of 2,3-diferrocenylcyclopropenone 1 with bis-1,4-N,O-nucleophiles in the presence of triethyloxonium tetrafluoroborate, alkyl iodides, morpholine, piperidine and Et3N is described. The characterization of the new compounds was done by IR, 1H- and 13C-NMR spectroscopy, mass-spectrometry, elemental analysis and X-ray diffraction studies.

Synthesis, Separation and Characterization of Naphthobenzo-condensed Porphyrazinato Nickel(II) Complexes

1997 ◽  
Vol 01 (02) ◽  
pp. 169-179 ◽  
Author(s):  
RAINER POLLEY ◽  
TORSTEN GOLO LINßEN ◽  
PATRICK STIHLER ◽  
MICHAEL HANACK
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Column Chromatography ◽  
Potential Importance ◽  
Macrocyclic Compounds ◽  
H Nmr ◽  
Advanced Technologies ◽  
Benzene Rings

Phthalocyanines and 2,3-naphthalocyanines are macrocyclic compounds which possess a variety of properties of potential importance in advanced technologies. The article discusses the influence of successive condensation of additional benzene rings to the phthalocyanine system. For this purpose three hexyloxy- and heptyl-substituted 2,3-dicyanonaphthalenes 3,7,11 and the respective 2,3-naphthalocyaninato nickel(II) complexes were prepared. In three statistical condensations of tetraphenylphthalodinitrile ( TPPN ) (12) and 2,3-dicyanonaphthalenes, 3,7,11, twelve unsymmetrical naphthobenzo-condensed porphyrazinato nickel(II) complexes 13b-15e were synthesized and separated by common column chromatography. All complexes were characterized by mass spectrometry, IR, UV and 1 H NMR spectroscopy.

scholarly journals β-D-galactopyranoside Seco-phytoporphyrin from Atropa Belladonna and Solanum Tuberosum Yellow Leaves Determined by Nuclear Magnetic Resonance

2021 ◽  
Author(s):  
Nina Djapic
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Solanum Tuberosum ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Column Chromatography ◽  
Atropa Belladonna ◽  
Structure Confirmation ◽  
Chlorophyll Catabolite ◽  
Nuclear Magnetic

The study described the isolation of β-D-galactopyranoside seco-phytoporphyrin from Atropa belladonna and Solanum tuberosum yellow leaves. Column chromatography was applied for its isolation. The UV-Vis, mass spectrometry and NMR spectroscopy were used for the structure confirmation. The results demonstrate that the two plants that the same chlorophyll catabolite structure.

Sign in / Sign up

Export Citation Format

Share Document