scholarly journals ISOLATION AND IDENTIFICATION OF TERPENOID COMPOUNDS FROM n-HEXANA EXTRACT OF PERMOT PLANT BRACTS (Passiflora foetida L)

2017 ◽  
Vol 11 (2) ◽  
pp. 80
Author(s):  
Maria Dewi Astuti ◽  
Tuti Sriwinarti ◽  
Kamilia Mustikasari
Keyword(s):  
Double Bond ◽  
1H Nmr ◽  
Nmr Spectra ◽  
Ester Group ◽  
Hexane Extract ◽  
Isolation And Identification ◽  
Methyl Group ◽  
Vacuum Liquid Chromatography ◽  
Passiflora Foetida ◽  
Group Carbon

Isolation and identification of terpenoids compounds from n-hexane extract of permot bracts plants (Passiflora foetida L.) has been done. Crude powder of the bracts permot plants were macerated with n-hexane. Fractionated of n-hexane extract on a vacuum liquid chromatography to afford three fractions (A, B and C). Purification of fraction B with TLC preparative to afford isolate B1 and B2.. A compound of spectra UV-Vis B1 indicating the presence of conjugation of double bond (C=C), furthermore the IR spectra showed vibration for - OH group, C=O of the ester group, C-O group, and methyl group (-CH3) in position gem dimethyl. 1H-NMR spectra showed the signal from methoxy group (OCH3), olefin protons (-CH=CH-), protons in carbon to the oxygenation (C-OH), two units gem dimethyl, and three methyl group (-CH3). 13C-NMR spectra showed thesignal from carbon aliphatic group, carbon carbonil (C=O) of the ester group, double bond carbon (C=C), and carbon to the oxygenation (C-OCH3 and C-OH)). Based on the analysis of UV-Vis, IR, 1H-NMR, and 1H-NMR spectrocopies data, isolate B1 is suggested from terpenoids type triterpenoids pentacyclic that conjugation of double bond and ester group.Keywords: Terpenoids, triterpenoids pentacyclic, permot (Passiflora foetida L.), and n-hexane extract.

scholarly journals Prototropic processes in benzaurins. 19F and 1H NMR spectra of fluoro- and methylsubstituted 4-hydroxyphenyl-diphenylcarbinols, related fuchsones and benzaurins

2011 ◽  
Vol 9 (2) ◽  
pp. 253-264 ◽  
Author(s):  
Poul Hansen ◽  
Alexsander Peregudov ◽  
Dimitrii Kravtsov ◽  
Antonina Krylova ◽  
Galina Babakhina ◽  
...  
Keyword(s):  
Water Molecule ◽  
1H Nmr ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Methyl Groups ◽  
Dynamic Nmr ◽  
Nmr Studies ◽  
Methyl Group ◽  
Carbonic Acids ◽  
Group Chemical

AbstractTautomerism of benzaurins and hydration are studied. 1H and 19F chemical shifts have been determined for a number of substituted 4-hydroxyphenyl-diphenyl carbinols containing fluorine in a 3-, 3*- or 4*-position, and for similar compounds containing additional methyl groups in a position of 3, 3** or 4**. The same data have been obtained for the fuchsones prepared by dehydration of the above carbinols. On this basis chemical shifts of fluorine in different positions have been evaluated as a monitor of the transformation of 4-hydroxyphenyl group to the semiquinone moiety. The 19F NMR can be used to monitor the transformation of 4**-fluorobenzaurin and the related 3,3*-disubstituted and 3,3*,5,5*-tetramethylsubstituted compounds to the corresponding carbinols due to the addition of a water molecule and to study the tautomerism of the two latter benzaurins as well as that of 3,3*,4**trifluorobenzaurin. Furthermore, fluorine and methyl group chemical shifts are sensitive to syn-anti-isomerism in substituted fuchsones.The prototropic process of these compounds may be slow or fast on a 1H NMR time scale depending on the solvent and may be catalyzed by water or carbonic acids. On the basis of kinetic and thermodynamic data obtained by dynamic NMR studies, a mechanism for the process has been proposed.

Bestimmung von Ringstromanisotropieeffekten im 1H-NMR - Spektrum von 9-Phenylderivaten des 1.4-Dimethylanthracens und 1.4-Dimethyltriptycens / Determination of Ring Current Anisotropy Effects in the 1H NMR Spectra of 9-Phenyl Derivatives of 1,4-Dimethylanthracene and 1,4-Dimethyltriptycene

1978 ◽  
Vol 33 (9) ◽  
pp. 1026-1032 ◽  
Author(s):  
Hans-Dieter Eßwein ◽  
Günter Häfelinger
Keyword(s):  
1H Nmr ◽  
Phenyl Ring ◽  
Nmr Spectra ◽  
Ring Current ◽  
Geometric Model ◽  
Maximum Deviation ◽  
Methyl Groups ◽  
Methyl Group ◽  
Derivatives Of

The 1,4-Dimenthyl-9-antliracenyl group is useful as a ring current probe for a 9-phenyl substituent. The splitting between the 1- and 4-methyl group signals due to the diamagnetic ring current anisotropy of the 9-phenylring is 0.84 ppm (0.85 ppm in 9-mesityl- 1,4-dimethylanthracene and 0.86 ppm in 9-phenyl-l,4,6,7-tetramethylanthracene), much larger than in phenylmesitylene (0.32 ppm). In 9-phenyl-1,4-dimethyltriptycene the splitting is reduced to 0.55 ppm due to the change in geometry. By use of an assumed geometric model for all four compounds the magnitude of the splitting could be predicted with a maximum deviation of 0.09 ppm using the tables of Haigh and Mallion. As effective magnetic location for the methyl group the midpoint of the basis of the CH3 cone was chosen. In 9-phenyl-1,4,5,8-tetramethyltriptycene the 9-phenyl ring is not orientated perpendicular but parallel to the 1,8-methyl groups and as the analysis of the ABCX-spin-spin system of the unsubstituted phenyl ring shows tilted by about 24 ° away from the 1,8- methylgroups.

29Si, 13C and 1H NMR spectra of some trimethylsiloxy- and bis(trimethylsiloxy)butene isomers

1983 ◽  
Vol 48 (11) ◽  
pp. 3097-3103 ◽  
Author(s):  
Jan Schraml ◽  
Ján Šraga ◽  
Pavel Hrnčiar
Keyword(s):  
Double Bond ◽  
Nmr Spectroscopy ◽  
Oxygen Atom ◽  
1H Nmr ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
1H Nmr Spectra ◽  
Trimethylsilyl Group ◽  
H Nmr ◽  
Steric Crowding

Three isomers of trimethylsiloxybutene were prepared and identified by 1H NMR spectroscopy to be 2-trimethylsiloxy-1-butene and E and Z 2-trimethylsiloxy-2-butenes. E and Z isomers of 2,3-bis(trimethylsiloxy-2-butene were also prepared. 29Si and 13C chemical shifts in these compounds are interpreted. The shifts indicate that the spatial arrangements in the CH3-C-O-Si(CH3)3 fragment is the same in all the pertinent compounds. Steric crowding forces the trimethylsilyl group to assume conformations in which conjugation between unshared electrons of oxygen atom and the electrons of the double bond is inhibited. As a result, olefinic β carbons are deshielded and the shielding of the silicon is increased.

scholarly journals Isolasi dan Identifikasi Senyawa Seskuiterpen dari Curcuma soloensis Val. (Temu Glenyeh)

2018 ◽  
Vol 4 (2) ◽  
pp. 137-142
Author(s):  
Soerya Dewi Marliyana ◽  
Muhamad Widyo Wartono ◽  
Fajar Rakhman Wibowo ◽  
Gesti Munasah
Keyword(s):  
Data Analysis ◽  
Medicinal Plant ◽  
1H Nmr ◽  
13C Nmr ◽  
Nmr Spectra ◽  
2D Nmr ◽  
Chemical Components ◽  
Spectroscopic Methods ◽  
Isolation And Identification

Curcuma soloensis Val. is a family plant Zingiberaceae and is known as "temu gelnyeh". This plant has been used as a medicinal plant but has not been widely reported about its chemical components. Therefore, this study was carried out to isolation and identification of the chemical components of the C. soloensis Val. rhizome. Isolation was done by extraction, fractionation, and purification. The fractionation and purification of the compound were carried out using chromatography methods. The identification of the compound was determined by spectroscopic methods including 1D-NMR (1H NMR, 13C NMR) and 2D-NMR (HSQC, HMBC). Based on NMR spectra data analysis and compared with literature, the compound obtained yellow liquid was ar-turmerone (2-methyl-6- (4-methylphenyl) hept-2-en-4-on) which was a terpenoid sesquiterpene. Ar-turmerone is the first compound that found from Curcuma soloensis Val. rhizome.  

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