scholarly journals Clerodane Diterpenes from Croton Species: Distribution and a Compilation of their 13C NMR Spectral Data

2006 ◽  
Vol 1 (4) ◽  
pp. 1934578X0600100 ◽  
Author(s):  
Sebastião F. Palmeira Jünior ◽  
Lucia M. Conserva ◽  
José Maria Barbosa Filho
Keyword(s):  
Spectral Data ◽  
Species Distribution ◽  
13C Nmr ◽  
Biological Activities ◽  
Review Of The Literature ◽  
Nmr Data ◽  
Clerodane Diterpenes ◽  
C Nmr

The present work is a review of the literature of clerodane diterpenes from Croton species. It contains a compilation of 13C NMR data of 83 of these diterpenoids and their biological activities. This review covers a period from 1969 to October 2005 and 224 references are cited.

8-Acyl-7-phenylbicyclo[2.2.2]-2,6-diones by rearrangement of 3-acyloxy-5-(2-phenylethenyl)-2-cyclohexen-1-ones. 1H and 13C NMR spectral evidence of their structure

1990 ◽  
Vol 55 (5) ◽  
pp. 1208-1215 ◽  
Author(s):  
Pavel Hrnčiar ◽  
Tibor Liptay ◽  
Ján Šraga
Keyword(s):  
Double Bond ◽  
Spectral Data ◽  
13C Nmr ◽  
1H And 13C Nmr ◽  
Spectral Evidence ◽  
C Nmr

3-Acyloxy-5-(2-phenylethenyl)-2-cyclohexen-1-ones II were prepared by O-acylation of 5-(2-phenylethenyl)-1,3-cycloxanedione (I). Treatment of II with AlCl3 resulted in rearrangement of the acyl group to the double bond of the phenylethenyl grouping followed by cyclization to 8-acyl-7-phenylbicyclo[2.2.2]octane-2,6-diones III. Their structure was evidenced by analysis of the 1H and 13C NMR spectral data.

scholarly journals Structural Investigations of C-Nitrosobenzenes. Part 3.1 Solid-state and Solution 13C NMR Studies, and Crystal Structure of E-(4-CIC6H4NO)2

1999 ◽  
Vol 23 (3) ◽  
pp. 202-203
Author(s):  
Daniel A. Fletcher ◽  
Brian G. Gowenlock ◽  
Keith G. Orrell ◽  
David C. Apperley ◽  
Michael B. Hursthouse ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
13C Nmr ◽  
Nmr Studies ◽  
Structural Investigations ◽  
Nmr Data ◽  
C Nmr

Solid-state and solution 13C NMR data for the monomers and dimers of 3- and 4-substituted nitrosobenzenes, and the crystal structure of E-(4-CIC6H4NO)2 are reported.

scholarly journals The NMR Spin Systems of Scutellaria 8β,13-Epoxy-neo-clerod-3-en-15,16-olides and Revision of 1H and 13C NMR Spectra Reported Data

2020 ◽  
Vol 15 (10) ◽  
pp. 1934578X2093378
Author(s):  
Josep Coll Toledano
Keyword(s):  
13C Nmr ◽  
Nmr Spectra ◽  
Spin Systems ◽  
13C Nmr Spectra ◽  
1H And 13C Nmr ◽  
Nmr Data ◽  
Reported Data ◽  
New Compounds ◽  
C Nmr ◽  
Shielding Effects

The present review of NMR spectroscopic structural elucidation data of new compounds isolated from Scutellaria species is focused on the title compounds, displaying a peculiar 13-spiro feature. It contains a compilation of 1H and 13C NMR data of these diterpenoids grouped by similar substitution patterns. Comparing shielding effects pointed out not only the identity of some compounds (already reported) but also potential misassignments and convenient revisions to get unambiguous structural proposals.

Australine and related alkaloids: easy structural confirmation by 13C NMR spectral data and biological activities

2003 ◽  
Vol 14 (3) ◽  
pp. 325-331 ◽  
Author(s):  
Atsushi Kato ◽  
Erika Kano ◽  
Isao Adachi ◽  
Russell J. Molyneux ◽  
Alison A. Watson ◽  
...  
Keyword(s):  
Spectral Data ◽  
13C Nmr ◽  
Biological Activities

13C-NMR chemische Verschiebung phenylsubstituierter polycyclischer Kohlenwasserstoffe / 13C-NMR Chemical Shift of Phenylsubstituted Polycyclic Hydrocarbons

1979 ◽  
Vol 34 (11) ◽  
pp. 1334-1343 ◽  
Author(s):  
W. Storek ◽  
J. Sauer ◽  
R. Stößer
Keyword(s):  
Chemical Shift ◽  
13C Nmr ◽  
Nmr Spectra ◽  
Ring Current ◽  
Current Effect ◽  
Nmr Data ◽  
Ring Current Effect ◽  
Anisotropic Contribution ◽  
Chemische Verschiebung ◽  
C Nmr

13C-NMR spectra of tetracene, rubrene, 1,3,5-tri-, penta-, and hexaphenylbenzene are reported. The discussion also includes the already known 13C-NMR data for diphenyl, 9,10-diphenyl-, 9,10-dibenzyl-, and 9,10-dimethyl-anthracene [1] as well as toluene. On the basis of CNDO/2 calculations different influences (diamagnetic and paramagnetic term, anisotropic contribution, ring current effect, geometry) on the chemical shift are analyzed for diphenyl and within the row benzene through tetracene

scholarly journals Occurrence, biological activities and 13C NMR data of amides from Piper (Piperaceae)

Química Nova ◽  
2012 ◽  
Vol 35 (11) ◽  
pp. 2288-2311 ◽  
Author(s):  
Jeferson C. do Nascimento ◽  
Vanderlúcia F. de Paula ◽  
Jorge M. David ◽  
Juceni P. David
Keyword(s):  
13C Nmr ◽  
Biological Activities ◽  
Nmr Data

Heliannuol: Distribution, Biological Activities, 1H and 13C-NMR Spectral Data

2020 ◽  
Vol 17 (3) ◽  
pp. 309-322 ◽  
Author(s):  
Carlos Magno Rocha Ribeiro ◽  
Thiago Silva Galvão de Souza ◽  
Karinne Canevalli de Almeida ◽  
Karen Danielle Borba Dutra ◽  
Alessandra Leda Valverde
Keyword(s):  
Biological Activity ◽  
Helianthus Annuus ◽  
Spectral Data ◽  
13C Nmr ◽  
Biological Activities ◽  
Rapid Identification ◽  
Routine Analysis ◽  
Important Class ◽  
1H And 13C Nmr ◽  
Crude Extracts

: Heliannuols are an important class of compounds isolated from Helianthus annuus, a common sunflower, with allelopathic properties. Interestingly, two of these fourteen compounds have been isolated from a gorgonian, Pseudopterogorgia rigida. This review compiles data on the isolation and biological activity of heliannuols described in the literature and briefly reports the papers describing their syntheses. This review could stimulate research into other natural species and syntheses. Further, it describes the 1H and 13C-NMR spectral data described in the literature for the 14 heliannuols already isolated and correlates them with their respective structures. Therefore, we believe that these searchable data enable a rapid identification in routine analysis of the crude extracts of sunflowers or gorgonians.

11B- und 13C-NMR-Spektroskopie von nido-Hexaalkyl-2.3.4.5-tetracarbahexaboranen(6) / 11B- und 13C-NMR Spectroscopy of nido-Hexaalkyl-2,3,4,5-tetracarbahexaboranes(6)

1982 ◽  
Vol 37 (4) ◽  
pp. 412-419 ◽  
Author(s):  
Bernd Wrackmeyer
Keyword(s):  
Nmr Spectroscopy ◽  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
Coupling Constants ◽  
Triple Resonance ◽  
Triple Resonance Experiments ◽  
Nmr Data ◽  
Nuclear Shielding ◽  
C Nmr

11B and 13C NMR data of peralkylated nido-2,3,4,5-tetracarbahexaboranes(6) are reported. Application of selective heteronuclear triple resonance experiments 13C{1H,11B} enables to assign the structures of various isomers. The magnitude of the coupling constants 1J(11B11B), 1J(13C11B) and 1J(13C13C) is in accord with expectations based on the conception of bonding in carboranes. The comparison of δ11B and δ13C data of the nido- 2,3,4,5-tetracarboranes(6) with δ13C-data of corresponding non-classical carbocations shows the influence of charge upon the nuclear shielding of carbon in the latter.

scholarly journals Integrated Analysis of the Bark Oil from Cinnamosma madagascariensis by GC(RI), GC-MS and NMR. 13C NMR data of Cyclocopacamphene and Cyclosativene

2017 ◽  
Vol 12 (2) ◽  
pp. 1934578X1701200
Author(s):  
Gabriel Garcia ◽  
Delphin Rabehaja ◽  
Julie-Marie Charmillon ◽  
Panja Ramanoelina ◽  
Joseph Casanova ◽  
...  
Keyword(s):  
13C Nmr ◽  
Integrated Analysis ◽  
Nmr Data ◽  
Leaf Oil ◽  
First Time ◽  
C Nmr

The composition of leaf and bark oils of Cinnamosma madagascariensis has been investigated by a combination of GC (RI), GC-MS and 13C NMR. The leaf oil contained mainly monoterpenes: myrcene (17.9%), limonene (17.8%), β-phellandrene (15.3%) and linalool (12.2%). The bark oil, investigated for the first time, contained β-pinene (49.9%) and α-pinene (19.5%) as major components. Special attention was paid to the identification of cyclocopacamphene, an epimer of cyclosativene. 13C NMR data of both compounds have been provided.

13C-NMR-Untersuchiingen an einigen Organosilanen /13 C NMR Studies on Some Organosilanes

1979 ◽  
Vol 34 (9) ◽  
pp. 1270-1274 ◽  
Author(s):  
Bernd Wrackmeyer ◽  
Werner Biffar
Keyword(s):  
13C Nmr ◽  
Structural Features ◽  
Coupling Constants ◽  
Coupling Mechanism ◽  
Nmr Studies ◽  
Nmr Parameters ◽  
Nmr Data ◽  
Fermi Contact ◽  
Fermi Contact Term ◽  
C Nmr

Abstract13C-NMR data (δ13C, J(13C1H), J(13C13C), J(29Si13C)) of noncyclic organosilanes CH4-n[Si(CH3)3]n (n = 1-4), (CH3)4-nC[Si(CH3)3]n (n = 1, 3, 4) and cyclic organosilanes [(CH3)2SiCH2]n (n = 2, 3), (CH3)2Si(CH2)3 are reported. Comparison of reduced coupling constants 1K proves the Fermi-contact-term to be the dominant coupling mechanism. Structural features of the four-membered heterocycles become apparent by comparison of their 13C NMR parameters with those of corresponding cycloalkanes, noncyclic organo­silanes and the 1,3,5-trisilacyclohexane derivative.

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