scholarly journals 1D AND 2D NMR STUDIES OF BENZYL O–VANILLIN

2010 ◽  
Vol 8 (3) ◽  
pp. 411-417 ◽  
Author(s):  
Mohammed Hadi Al–Douh ◽  
Shafida Abd Hamid ◽  
Hasnah Osman
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
Benzyl Bromide ◽  
2D Nmr ◽  
Coupling Constants ◽  
Nmr Studies

The reaction of o-vanillin A with benzyl bromide B2 in acetone as the solvent and K2CO3 as a base in the presence of tetra-n-butylammonium iodide (TBAI) as catalyst formed benzyl o-vanillin, C. The complete assignments of C using PROTON, APT, DEPT-135, COSY, NOESY, HMQC and HMBC NMR in both CDCl3 and acetone-d6 are discussed, and the coupling constants J are reported in Hertz (Hz).     Keywords: 1H NMR; 13C NMR; 2D NMR; Benzyl o-Vanillin

scholarly journals 1D AND 2D NMR STUDIES OF 2–(2–(BENZYLOXY)–3–METHOXYPHENYL)–1H–BENZIMIDAZOLE

2010 ◽  
Vol 7 (2) ◽  
pp. 190-196
Author(s):  
Mohammed Hadi Al–Douh ◽  
Shafida Abd Hamid ◽  
Hasnah Osman
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
2D Nmr ◽  
Coupling Constants ◽  
Nmr Studies ◽  
Phenylene Diamine

The reaction of Benzyl o-vanillin 1 and o-phenylene diamine 2 in dichloromethane produced new benzimidazole, 3. The complete assignments of 3 were made using 1D and 2D NMR including COSY, HMQC and HMBC NMR in CDCl3 and acetone-d6. The coupling constants J are reported in Hertz, and the differences in the peak splittings using both solvents are discussed.   Keywords: 1H NMR; 13C NMR; 2D NMR; Benzimidazole

scholarly journals Microwave-Assisted Regioselective Synthesis and 2D-NMR Studies of New 1,2,3-Triazole Compounds Derived from Acridone

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Mohammed Aarjane ◽  
Siham Slassi ◽  
Bouchra Tazi ◽  
Amina Amine
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
Cycloaddition Reaction ◽  
Reaction Times ◽  
2D Nmr ◽  
Dipolar Cycloaddition ◽  
Microwave Assisted Synthesis ◽  
Nmr Studies ◽  
Microwave Assisted ◽  
Acridone Derivatives

A simple and mild protocol towards the synthesis of new 1,2,3-triazole compounds derived from acridone has been developed via regiospecific 1,3-dipolar cycloaddition reaction between 10-(prop-2-yn-1-yl)acridone derivatives and aromatic azides using CuI as a catalyst. The cycloaddition reaction has been performed using conventional as well as microwave-assisted methods. Microwave-assisted synthesis caused a significant reduction in the reaction times and improvement in the yields of all the synthesized compounds compared with the conventional method. The structure of the 1,4-disubstituted 1,2,3-triazoles has been elucidated by IR, HRMS, 1H-NMR, 13C-NMR, and 2D NMR (1H-13C HMBC, 1H-1H COSY, and 1H-1H NOESY) spectroscopies.

The Electron Effect of Aromatic Group: Control Conformation of 2-Aromatic Cyclododecanone Derivatives

2020 ◽  
Vol 24 (10) ◽  
pp. 1139-1147
Author(s):  
Yang Mingyan ◽  
Wang Daoquan ◽  
Wang Mingan
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
Nmr Spectra ◽  
Coupling Constants ◽  
The Other ◽  
Repulsive Interaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electron Effect ◽  
Group Control

2-Phenylcyclododecanone and 2-cyclohexylcyclododecanone derivatives were synthesized and characterized by 1H NMR, 13C NMR, HR-ESI-MS and X-ray diffraction. Their preferred conformations were analyzed by the coupling constants in the 1H NMR spectra and X-ray diffraction, which showed the skeleton ring of these derivatives containing [3333]-2-one conformation, and the phenyl groups were located at the side-exo position of [3333]-2-one conformation due to the strong π-π repulsive interaction between the π- electron of benzene ring and π-electron of carbonyl group. The cyclohexyl groups were located at the corner-syn or the side-exo position of [3333]-2-one conformation depending on the hindrance of the other substituted groups. The π-π electron effect played a crucial role in efficiently controlling the preferred conformation of 2-aromatic cyclododecanone and the other 2-aromatic macrocyclic derivatives with the similar preferred square and rectangular conformations.

1H NMR and 13C NMR Studies of Oil from Pyrolysis of Indonesian Oil Sands

2016 ◽  
Vol 30 (3) ◽  
pp. 2478-2491 ◽  
Author(s):  
Wang Qing ◽  
Jia Chunxia ◽  
Ge Jianxin ◽  
Guo Wenxue
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
Oil Sands ◽  
Nmr Studies

scholarly journals ISOLASI SENYAWA ALKALOID TURUNAN FUROKUINOLIN DARI RANTING Toddalia asiatica L. DAN UJI AKTIVITAS ANTIKANKER

2019 ◽  
Vol 3 (2) ◽  
pp. 102
Author(s):  
Mulyadi Tanjung ◽  
Devina Oktari Rahayu ◽  
Tjitjik Srie Tjahjandarie
Keyword(s):  
Anticancer Activity ◽  
Cancer Cells ◽  
1H Nmr ◽  
13C Nmr ◽  
Room Temperature ◽  
Spectroscopic Analysis ◽  
2D Nmr ◽  
Activity Test ◽  
Key Word ◽  
Toddalia Asiatica

AbstrakToddalia asiatica merupakan tumbuhan perdu yang tersebar di Afrika, Asia, Madagascar, dan Australia (Hu et al., 2015). Senyawa metabolit sekunder yang ditemukan tumbuhan Toddalia asiatica L. adalah alkaloid. Ekstraksi senyawa alkaloid dari tumbuhan Toddalia asiatica L. dengan cara maserasi menggunakan pelarut metanol pada suhu kamar. Proses isolasi dilakukan melalui fraksinasi dan pemurnian menggunakan kromatografi kolom gravitasi, dan kromatografi radial. Hasil isolasi yang didapatkan merupakan senyawa alkaloid turunan furokuinolin yaitu skimmianin. Struktur senyawa alkaloid turunan furokuinolin yang  diketahui melalui analisa hasil spektroskopi UV, IR, 1D NMR (1H-NMR dan 13C-NMR),  serta 2D NMR (HMBC dan HMQC) dan uji aktivitas antikanker terhadap sel kanker murin leukemia P-388. Kata kunci : Alkaloid turunan furokuinolin, skimmianin, Toddalia asiatica L., antikanker AbstractToddalia asiatica L. is a bushy plant that spreads in Africa, Asia, Madagascar, and Australia (Hu et al., 2015). The secondary metabolite compound found in Toddalia asiatica L. is alkaloid. Extraction of alkaloid compounds from Toddalia asiatica L. by maceration using methanol at room temperature. The isolation process is diluted by fractionation and purification using column chromatography of gravity and radial chromatography. The result  of isolation is an alkaloid compound derived furokuinolin, skimmianin. The structure of alkaloid compounds derived from furokuinolin known through spectroscopic analysis including UV, IR, 1D NMR (1H-NMR and 13C-NMR), and 2D NMR (HMBC and HMQC) and the anticancer activity test against the cancer cells murine P-388.Key word :    Alkaloid  compound  derived  furokuinolin,  skimmianin,  Toddalia asiatica L., anticancer

scholarly journals THE PORIFERASTA COMPOUND-5,22E,25-TRIEN-3-Oβ FROM Clerodendrum paniculatum LEAF AS INDUCER AGENT OF SYSTEMIC RESISTANCE ON RED CHILLI PLANT Capsicum annuum L FROM CUCUMBER MOSAIC VIRUS (CMV

2010 ◽  
Vol 9 (3) ◽  
pp. 487-490
Author(s):  
Weny Musa ◽  
Hersanti Hersanti ◽  
Achmad Zainuddin ◽  
Roekmi-ati Tjokronegoro
Keyword(s):  
Cucumber Mosaic Virus ◽  
Mosaic Virus ◽  
Capsicum Annuum ◽  
1H Nmr ◽  
13C Nmr ◽  
Spectroscopic Data ◽  
2D Nmr ◽  
Systemic Resistance ◽  
Inhibition Activity ◽  
Chilli Plant

The poriferasta-5.22E.25-trien-3β-ol compound of leaves of this plant Clerodendrum paniculatum has activity as an inducer agent of plant systemic resistance of red plant toward Cucumber Mosaic Viruses (CMV), the inhibition activity compound shows 82% inhibition activity at 300 ppm. The structure of these compound were determined on the basis of spectroscopic data including UV, IR, 1H-NMR, 13C-NMR and 2D-NMR   Keywords: Poriferasta-5.22E.25-trien-3β-ol, Clerodendrum paniculatum, induction of systemic resistance, CMV

Two New Chalcone Glycoside Compounds from Viburnum lantana (Family Caprifoliaceae) and Antioxidant Activity of its Hydroalcoholic Extract

2019 ◽  
Vol 16 (2) ◽  
pp. 93-98
Author(s):  
Ali Shafaghat ◽  
Mohammad Shafaghatlonbar
Keyword(s):  
Antioxidant Activity ◽  
Ir Spectra ◽  
1H Nmr ◽  
13C Nmr ◽  
Natural Antioxidants ◽  
2D Nmr ◽  
Antioxidant Property ◽  
Hydroalcoholic Extract ◽  
First Time

In the present study, two novel chalcone glycosides, trans-3-ethoxy-4-O-(glucopyranoside) -2', 3', 4', 5', 6' -pentahydroxy chalcone (compound 1) and trans-3-methoxy-4-O-(glucopyranoside) -2', 3', 4', 5', 6' -pentahydroxy chalcone (compound 2) have been isolated from the leaves of Viburnum lantana L. The structures were elucidated by using 1H-NMR, 13C-NMR, 2D-NMR such as HMQC, HMBC and NOE experiments and UV-Vis, MS and IR spectra. The antioxidant property of hydroalcoholic extract was evaluated by DPPH style. The results revealed that the leave extract possesses significant antioxidant activity (IC50 = 52 µg/mL). This study indicates that hydroalcoholic extract of the leaves from this species is an important source of chalcone and flavonoid derivatives, as well as of useful natural antioxidants. These chalcone glycoside compounds were isolated for the first time from V. lantana leaves.

EXTRACTION, ISOLATION AND SYNTHESIS OF DERIVATIVES OF URSOLIC ACID

INDIAN DRUGS ◽  
2012 ◽  
Vol 49 (01) ◽  
pp. 33-37
Author(s):  
S. B. Babar ◽  
◽  
K. S. Laddha
Keyword(s):  
Petroleum Ether ◽  
Ursolic Acid ◽  
1H Nmr ◽  
13C Nmr ◽  
Methanol Extract ◽  
Nmr Studies ◽  
Simple Method ◽  
Synthetic Derivatives ◽  
Derivatives Of

Study was undertaken with an objective to develop a simple method for isolation of ursolic acid from Nerium indicum Mill leaves and to prepare synthetic derivatives of ursolic acid. The leaves were defatted with petroleum ether and then extracted with methanol. Methanol extract was basified and subsequently acidified, followed by charcoal treatment to isolate ursolic acid. Synthetic derivatives were prepared from isolated ursolic acid by substitution at C-3 position. The structure of ursolic acid and its derivatives were confirmed by IR, MS, 1H NMR, 13C NMR studies.

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