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Various Spectroscopic Techniques (various + spectroscopic_techniques)
Selected AbstractsSynthesis, Structural Characterisation and Reactions of Some Vinylgold(I) Phosphane ComplexesEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 4 2006Fabian Mohr Abstract A series of vinylgold(I) complexes [Au(CR=CHR)L] (R = H, Me; L = PPh3, PPh2Me, PPhMe2) were prepared from the reaction of the Grignard reagents [MgBr(CR=CHR)] (R = H, Me) with the gold(I) phosphane complexes [AuCl(L)] (L = PPh3, PPh2Me, PPhMe2) at low temperature. The complexes were characterised by various spectroscopic techniques and, in the case of [Au(CMe=CHMe)(PPh3)], by a single-crystal X-ray structure determination. The gold,carbon bonds of these vinylgold(I) complexes are easily cleaved by acids and, in the presence of potassium permanganate, by species containing acidic protons. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006) [source] Synthetic, Structural, and Electrochemical Studies of 2-Ferrocenyl- and2-Cymantrenyl-Functionalized 2,3-Dihydro-1H -1,3,2-diazaboroles and1,3,2-DiazaborolidenesEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 23 2005Lothar Weber Abstract Reaction of (dibromoboryl)ferrocene (1) with 1 equiv. of the diazabutadiene tBuN=CH,CH=NtBu, and subsequent reduction of the obtained borolium salt 2 with sodium amalgam, affords the first ferrocenyl-functionalized 1,3,2-diazaborole (3). Similarly, 1,1,-bis(dibromoboryl)ferrocene (4) can be transformed into compound 6, which contains two diazaborolyl substituents at the ferrocene core. Treatment of precursors 1 and 4 with 1,2-bis(tert -butylamino)ethane in the presence of Et3N gives rise to the formation of the diazaborolidine derivatives 13 and 14. 1-Dibromoboryl-3-methylcymantrene (7) was also treated with tBuN=CH,CH=NtBu to give the borolium salt 8, which was subsequently reduced to the 2-cymantrenyl-diazaborole 9. Treatment of 7 with tBuN(H)CH2CH2N(H)tBu in the presence of Et3N furnished the corresponding 2-cymantrenyl-diazaborolidine 15. The novel compounds were characterized by elemental analyses and various spectroscopic techniques (IR; 1H, 13C, and 11B NMR; MS). The molecular structures of 3, 6, and 15 were elucidated by X-ray diffraction analyses. Cyclovoltammetric studies of the ferrocene derivatives at high scan rates show features of a quasireversible oxidation at the iron center. The heterocyclic groups serve as electron donors, considerably lowering the oxidation potential of the central iron atoms when compared to the parent compound ferrocene. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005) [source] Micranthin C, a Novel 13(12,11)abeo -Abietanoid from Isodon lophanthoids var. micranthusHELVETICA CHIMICA ACTA, Issue 10 2003Ai-Hua Zhao A novel 13(12,11)abeo -abietane skeletal diterpenoid, micranthin C (1), was isolated from Isodon lophanthoids var. micranthus. Its structure was determined by various spectroscopic techniques and finally confirmed by single-crystal X-ray diffraction. [source] Synthesis of benzo[b][1,4]thiazepines by the reaction of 3-aryl-1-(3-coumarinyl)propen-1-ones with 2-aminothiophenol,JOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 6 2007Albert Lévai 3-(2-Aryl-2,3-dihydro-benzo[b][1,4]thiazepin-4-yl)chromen-2-ones (2a, e, f) and (Z)-3-(2,3-dihydro-2-arylbenzo[b][1,4]thiazepin-4(5H)-ylidene)chroman-2-ones (3a-f) have been synthesized by the reaction of 3-aryl-1-(3-coumarinyl)propen-1-ones (1a-f) with 2-aminothiophenol in a hot mixture of toluene and acetic acid. Structures of all new compounds and their complete 1H and 13C assignments were achieved applying different one- and two-dimensional nmr experiments in combination with various spectroscopic techniques. [source] Organotin(IV) tryptophanylglycinates: potential non-steroidal antiinflammatory agents; crystal structure of dibutyltin(IV) tryptophanylglycinateAPPLIED ORGANOMETALLIC CHEMISTRY, Issue 9 2009Mala Nath Abstract Diorganotin(IV) derivatives of tryptophanylglycine (H2Trp,Gly) with general formula R2Sn(Trp,Gly), where R = Me, n -Bu, Ph and n -Oct, and triorganotin(IV) derivatives R,3 Sn(HTrp,Gly) where R, = Me, n -Bu and Ph, have been synthesized and structurally characterized in the ,solid state as well as in solution on the basis of various spectroscopic techniques, viz. FT-IR, multinuclear 1H, 13C and 119Sn NMR, 119Sn Mössbauer and single crystal X-ray diffraction. These investigations suggest that tryptophanylglycine in R2Sn(Trp,Gly) acts as dianionic tridentate coordinating through carboxylate oxygen [C(O)O,], amino nitrogen (NH2) and N,peptide, while in the case of R,3 Sn(HTrp,Gly), the ligand acts as monoanionic bidentate coordinating through C(O)O, and NH2. This is further confirmed by the single-crystal X-ray structure of n -Bu2Sn(Trp,Gly) which shows that two butyl groups and peptide nitrogen (N,peptide) are in the equatorial positions, while the two axial positions are occupied by the carboxylic oxygen [C(O)O,] and the amino nitrogen (NH2) atom from the same ligand molecule in the distorted trigonal,bipyramidal geometry around tin. The anti-inflammatory (using the carrageenan-induced paw edema bioassay in rats), cardiovascular activities and acute toxicity (LD50) of some of these compounds have been examined. All of the studied R2Sn(Trp,Gly) and Ph3Sn(HTrp,Gly) exhibit very high anti-inflammatory activities comparable to that of phenylbutazone along with high safety margin (LD50 > 400 mg kg,1) with no side effects on the cardiovascular system. Copyright © 2009 John Wiley & Sons, Ltd. [source] | ||||||||||