- A new fatty aldol ester from the aerial part of Mimosa invisa (Mimosaceae)
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A new aldol ester named 17-O-triacontanoylheptadecanal (1) was isolated from the aerial part of Mimosa invisa (Mimosaceae) together with eight known compounds identified as β-sitosterol (2), α-amyrine (3), lupeol (4), 4-O-methylepinumisoflavone (5), alpinumisoflavone (6), betulinic acid (7), 3-O β- D-glucopyranoside of sitosterol (8) and epirobinetinidol (9). The structures of compounds were determined on the basis of NMR and mass spectrometry data as well as by comparing the data reported in the literatures. The antimicrobial activities of the crude extract and compounds 1 and 9 were investigated against seven microbial species. The natural products showed moderate activities compared to that of the crude extract.
- Nana, Frederic,Sandjo, Louis Pergaud,Keumedjio, Felix,Kuete, Victor,Ngadjui, Bonaventure Tchaleu
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- Bioactive phenylethanoids and coumarines from basalmocitrus cameroonensis
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Two new phenylethanoids, basalefhanoid A (1) and B (2), and one new ceramide, basalamide A (3), together with eleven known compounds (4-14) were isolated from the MeOH extract of the stem barks of Basalmocitrus cameroonensis. The structures of all compoun
- Wansi, Jean Duplex,Djouaka Bavoua, Judith Liliane,Happi, Emmanuel Ngeufa,Devkota, Krishna Prasad,Lenta, Bruno Ndjakou,Mesaik, Muhammed Ahmed,Choudhary, Muhammad Iqbal,Fomum, Zacharias Tanee,Sewald, Norbert
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experimental part
p. 452 - 458
(2009/08/08)
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- A facile synthesis of long chain acyclic alkanols via Kolbe coupling: 1-Docosanol and 1-triacontanol
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A convenient synthesis of long chain acyclic alkanols viz., 1-docosanol and 1-triacontanol has been devised via Kolbe radical coupling of mono-methyl azelate 2, which has been synthesized from azelaic acid 1. The dimer viz. dimethyl thapsate 3, on Ba(OH)2 hydrolysis affords mono-methyl thapsate 4, which upon mixed Kolbe coupling with appropriate alkanoic acid [CH3(CH)2)nCOOH, n = 6 for 1-docosanol and n = 14 for 1-tri-acontanol] gives the cross coupled products methyl docosanoate 7 and methyl triacontanoate 8 along with the radical dimers dimethyl triacontanedioate 4′ and tetradecane 5′/triacontane 6′ as byproducts. Compounds 7 and 8 on LAH reduction in dry THF yield 1-docosanol 9 and 1- triacontanol 10, respectively in high yields. The mixed anodic coupling has been studied by varying parameters viz. degree of neutralization and molar ratio of compounds 4 and C8/C16 alkanoic acid, current density, anode material etc.
- Yadav, Ashok K.,Singh, Arpita
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p. 1724 - 1726
(2007/10/03)
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- Tris (trimethylsilyl)silane in the deoxygenation of long chain unsaturated alcohols converts cis to trans isomers
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During radical deoxygenation reactions tris (trimethylsilyl)silane can cause cis to trans isomerization and reduction of remote double bonds in contrast to tributyltin hydride.
- Johnson,Poulos
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p. 2045 - 2048
(2007/10/02)
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- OZONOLYSIS OF ALKENES AND REACTIONS OF POLYFUNCTIONAL COMPOUNDS XLI. SYNTHESIS OF OXYGEN-CONTAINING DERIVATIVES OF TRIACONTANE
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Triacontanoic acid, its ester, triacontan-1-ol, and also their 12-Z-unsaturated analogs were synthetized on the basis of methyl 12-oxododecenoate, which is the product from ozonolysis of cyclododecene.
- Odinokov, V. N.,Akhmetova, V. R.,Khasanov, Kh. D.,Abduvakhabov, A. A.,Tolstikov, G. A.
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p. 1209 - 1210
(2007/10/02)
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- A New Synthesis of Long Chain Acid Esters and Carbinols
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A versatile synthesis of difficulty accessible long chain acid esters and carbinols is described.The synthesis involves acylations at 2- and 5-positions of thiophene.Thioketalation of the resulting ketoesters followed by Raney nickel desulfurization yield acid esters which on LAH reduction give the corresponding carbinols.
- Rao, S. Jagadishwar,Bhalerao, U. T.,Tilak, B. D.
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p. 208 - 211
(2007/10/02)
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- A CONVENIEN SYNTHESIS OF 1-TRIACONTANOL, A PLANT CROWTH GORMONE
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A synthesis of 1-triacontanol, a plant growth regulator, starting from myristic acid and by two succesive additions of eight and nine carbon units from sebacic acid in Kolbe electro-organic process has been reported.
- Joshi, U. R.,Kapadi, A. H.
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p. 681 - 686
(2007/10/02)
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- NEW SYNTHESIS OF 1-TRIACONTANOL
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Succinic anhydride and behenic acid have been used to attach C4 and C22 carbon chains on to 2 and 5 positions of thiophene through two alternate acylation sequences.Raney nickel desulphurization to the 2,5-disubstituted thiophene yielded triacontanoic acid esters which on LAH reduction gave 1-triacontanol.
- Bhalerao, U. T.,Rao, Jagadishwar S.,Tilak, B. D.
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p. 5439 - 5440
(2007/10/02)
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- SYNTHESE DU TRIACONTANOL-1 PAR METATHESE FONCTIONALISEE
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The synthesis of triacontanol (4b) is described from the cross-metathesis of cyclododecene (2) and methyl oleate (1a) or oleyl acetate (1b).
- Villemin, Didier
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p. 2855 - 2856
(2007/10/02)
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- A CONVENIENT SYNTHESIS OF 1-TRIACONTANOL
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1-Triacontanol, a new plant growth regulator, has been synthesised starting from stearic acid, and by two successive additions of six carbon units through enamine intermediates.
- Rama Rao, A. V.,Deshmukh, M. N.,Kamalam, M.
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p. 227 - 230
(2007/10/02)
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