Aromatic compounds

In this paper, we reported the isolation and structure resolution of five flavonoids including three flavan-3-ol compounds, (+)-catechin (1), (-)- catechin (2), and catechin 3- O-α-L-rhamnopyranoside (3), one flavone, chrysoeriol (4) and one flavononol, engeletin (5) from leaves of C. brachiata Merr.

7p viyoko 01-10-2024 4 1   Download

The efficient synthesis of 12-substituted-3,4,4a,5,12,12a-hexahydrobenzo[b]acridine-1,6,11(2H)-triones starting from 2-amino-1,4-naphthoquinone, 1,3-cyclohexanedione, and different (hetero)aromatic aldehydes was developed. These reactions were carried out in acetic acid under microwave irradiation in the presence of p-toluenesulfonic acid as catalyst. The structure of the newly synthesized compounds were confirmed employing spectroscopic data as well as elemental analysis. The plausible mechanism of these three-component domino reactions was also described.

7p dianmotminh02 03-05-2024 4 1   Download

The present study investigated the phytochemical and biological properties of the rhizomes C. aromatica. From the CHCl3 extract of C. aromatic rhizomes, six known compounds, including (-)-hannokinol, (3R,5R)-3,5-diacetoxy-1,7-bis(4- hydroxyphenyl)heptane, naringenin, 2-(4- (hydroxymethyl)phenyl)propan-2-ol, 5-hydroxymethylfurfural, and bisacurone, were isolated. All compounds were tested on the biological inhibitory activities against tyrosinase, αglucosidase, and urease. It was the first time all compounds were isolated from rhizomes of C. aromatica Salisb.

6p dianmotminh02 03-05-2024 4 3   Download

Bài giảng "Hóa hữu cơ: Chương 7 - Hydrocacbon thơm (Aromatic compounds)" được biên soạn với các nội dung chính sau: Phân loại, nguồn gốc; Danh pháp; Cấu trúc; Tính chất vật lý; Các phương pháp điều chế; Tính chất hóa học của Hydrocacbon thơm. Mời các bạn cùng tham khảo chi tiết bài giảng tại đây!

48p kimphuong59 01-02-2023 20 3   Download

Twelve volatile constituents were identified from Liverwort Porella densifolia (Hepaticae) collected at Ham Rong Mountain, Sapa, Lao Cai Province by gas chromatography/mass spectrometry (GC/MS). The volatile constituents including some monoterpenes (β-myrcene, α- pinene and camphene); two major sesquiterpenes, deoxopinguisone and bicyclogermacrene-2 were identified.

4p larachdumlanat127 20-12-2020 6 2   Download

Ten aromatic aldazines: 4-nitrobenzal-, 3-nitrobenzal-, 2-nitrobenzal-, 4-dimethylaminobenzal-, 4-methoxybenzal-, 3-methoxybenzal-, 4-fluorobenzal-, 4-chlorobenzal-, 4-bromobenzaldazine and 7-carboxymethoxy-6-hydroxy-3-sulfoquinolin-5-carbaldazine, were synthesized by condensing two equivalents of an appropriate aldehyde with one equivalent of hydrazine hydrate. The structure of the received aldazines was determined by IR, 1H-NMR and ESI MS spectra.

6p tamynhan8 04-11-2020 14 2   Download

Từ 4,5-đimetoxi-2-(3-metylfuran-4-yl)phenylamine, đem điazoni hóa sau đó ghép với các amin và phenol thơm tạo thành 8 hợp chất azo. Cấu trúc của các hợp chất này được các định bằng các phương pháp phổ IR, 1H NMR, 13C NMR, HSQC, HMBC. Đã thử hoạt tính kháng vi sinh vật kiểm định của 3 hợp chất. Fom 4,5-dimethoxy-2-(3-methylfuroxan-4-yl)phenylamine, diazonium and followed by pairing with aromatic amines and phenols to obtain 8 azo compounds. These compounds have been measuredby IR, 1H RRN, 13C NMR, HSQC, HMBC to determine their structuresand.

6p khidoichuoi 04-03-2020 74 4   Download

4-Amino-3-(2-methoxy-4-propylphenoxymethylen)-(1H)-1,2,4-triazole-5-thione was prepared from eugenol in Ocimum Sanetum L. essential oil. A series of 7 imines were synthesized from these key compounds by condensing it with different aromatic aldehydes. The structures of these imines were confirmed by EI MS, IR and NMR spectroscopy, in many cases 2D NMR spectra are also used.

5p uocvong04 24-09-2015 30 3   Download

Two derivatives of 2-thioxoquinazolin-4(3H)-one including compounds 3 and 5 were synthesized by cyclization reaction of anthranilic acid with ethyl isothiocyanate and phenyl isothiocyanate, respectively. Eight novel derivatives of 2-thioxoquinazolin-4(3H)-one including compounds (7a-h) were synthesized by cyclization reaction of derivatives of anthranilic acid with aromatic amines and carbon disulfide in potassium hydroxide/methanol. The obtained compounds were structurally determined by IR, MS, 1 H NMR and 13 C NMR analysis method.

6p uocvong03 24-09-2015 44 3   Download

CYP73 enzymes are highly conserved cytochromes P450 in plant species that catalyse the regiospecific 4-hydroxylation ofcinnamicacid to formprecursorsofligninandmanyother phenolic compounds. A CYP73A1 homology model based on P450 experimentally solved structures was used to iden-tify active site residues likely togovern substrate binding and regio-specific catalysis. The functional significance of these residues was assessed using site-directedmutagenesis.

12p tumor12 20-04-2013 40 3   Download

1. ACD Labs (Advance Chemical Development) - Tập hợp nhiều tiện ích trong việc thiết kế và khảo sát mô hình phân tử. 2. Alkane Nomenclature 2.1 - Ôn tập danh pháp Ankane (giống như trò chơi đố danh pháp vậy). 3. Aromatic Compound Nomenclature 1.7 - Ôn tập danh pháp Hydrocacbon thơm. 4. Atoms, Symbols and Equations 4.0 - Đây là một chương trình trắc nghiệm Hóa học, đưa ra các câu hỏi trắc nghiệm về nguyên tử và cấu tạo nguyên tử, có 8 bài trắc ngiệm khác nhau với nhiều câu hỏi khảo sát cấu trúc nguyên...

3p nkt_bibo42 03-02-2012 205 25   Download

BASICS OF CRUDE OIL Crude oils are complex mixtures containing many different hydrocarbon compounds. An average crude oil contains about 84% carbon, 14% hydrogen, 1 ÷ 3% sulfur and less than 1% each of nitrogen, oxygen, metals and salts. Simple crude oil assays are used to classify crude oils as paraffinic, naphthenic, aromatic or mixed, based on the predominant proportion of similar hydrocarbon molecules. The comprehensive crude assays determine the value of the crude: its yield and quality of useful products.

5p vitconsieuquay 19-08-2011 247 141   Download

To be classified as aromatic, a compound must meet both of the following criteria: It must have an un-interrupted cyclic p cloud above & below the plane of the molecule. The p cloud must contain (4n + 2) p electrons (n = 0, 1, 2…).

40p 3dagkhoa 28-10-2010 94 27   Download