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1.
Hiroshi Hori Yoshihiro Nishida Hiroshi Ohrui Hiroshi Meguro 《Journal of carbohydrate chemistry》2013,32(5):601-618
ABSTRACT D-Mannose derivatives stereospecifically deuterated at C-6 were synthesized and the unequivocal 1H NMR assignments of H-6proS and H-6pro R were made. The preferred conformation of the hydroxymethyl groups of these compounds are discussed. 相似文献
2.
Mohammad Hossein Habibi Shahram Tangestaninejad A. Fallah-Shojaie I. Mohammadpoor-Baltork S. F. Tayyari 《Phosphorus, sulfur, and silicon and the related elements》2013,188(8):1863-1871
Several preparative routes to bis[N(substituted-phenyl) 4-nitro-thiobenzamidato] mercury(II) complexes are presented, including the reaction of mercury(II) oxide, fluoride, chloride, bromide, cyanide, acetate, and nitrate with N(substituted-phenyl) 4-nitro-thiobenzamide derivatives. 1 H-NMR, Raman, and IR measurements confirmed the complexation of mercury to sulphur. 相似文献
3.
Jinyu Shen H. Fred Koch D. Max Roundhill 《Journal of inclusion phenomena and macrocyclic chemistry》2000,38(1-4):57-67
Calix[4]arenes with both ligating and methoxy poly(ethylene glycol) groups appended have been synthesized using several approaches, involving the formation of sulfonyl ester groups on the wide rim, Schiff base derivatives on the narrow rim, and thioether groups on both the wide and narrow rims. These new derivatives have been characterized by a combination of infrared and 1H NMR spectroscopy. Compounds 10 and 11 are insoluble in both water and aqueous poly(ethylene glycol), but the other new compounds are soluble. 相似文献
4.
Akbar Mobinikhaledi Naser Foroughifar Somayeh Faghihi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(7):1837-1842
Treatment of 2-aminopyridine ( 1 ) with chloroacetyl chloride in dry benzene gave 2-chloro-N-(pyridin-2-yl)acetamide ( 3 ), which on further reaction with potassium thiocyanate gave 2-imino-3-(pyridin-2-yl)thiazolidin-4-one ( 4 ) as an intermediate compound for the synthesis of pyridin-2-yl substituted 2-imino-thiazolidine-4-one derivatives. Cyclocondensation reaction of ( 4 ) with a series of aromatic aldehydes gave 5-arylidene derivatives of pyridin-2-yl substituted 2-imino-thiazolidine-4-ones 5a–j . 1 H and 13C NMR spectroscopy, as well as elemental analyses, were used for the identification of these new compounds. 相似文献
5.
H. P. S. Chauhan Jaswant Carpenter Sumit Bhatiya Abhilasha Bakshi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(12):1713-1722
Abstract Replacement reactions of bis(diethyldithiocarbamato)antimony(III) chloride have been carried out with oxygen and sulfur donor ligands such as disodium oxalate, sodium acetate, sodium salicylate, benzoic acid, thioglycolic acid, acetylacetone, thiphenol, ethane-1,2-dithiol, and 2,2-dimethylpropane-1,3-diol to give mixed bis(diethyldithiocarbamato)antimony(III) derivatives of the corresponding ligands. These derivatives have been characterized by the physicochemical [melting point and molecular weight determination, elemental analysis (C, H, N, S, and Sb)], spectral [FT-IR, far-IR, NMR (1H and 13C)], ESI-mass, powder XRD, and SEM studies. [Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: Additional figures and tables] 相似文献
6.
Kiran Sankhala Alok Chaturvedi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(10):1427-1432
Abstract Aluminum(III) derivatives of O-alkyl or O-aryl trithiophosphate of the type Al[S2P(SH)OR]3 (R = Me, Et, Pri, Bui, Ph, CH2Ph) have been synthesized. The products were obtained as white powdery solids. The monomers are soluble in common organic solvents and were characterized by elemental analyses, molecular weight determinations, and IR and (1H, 27Al, and 31P) NMR spectroscopic studies, which are consistent with six coordinated aluminum and bidentate behavior of the trithiophosphate moiety. The products also exhibit antifungal effectiveness against powdery mildew disease. 相似文献
7.
Hong-Yu Fan 《Natural product research》2020,34(14):1962-1970
AbstractRegioselective synthesis of three novel palmitates of 20(R)-ginsenoside Rg3 was accomplished via a facile strategy, along with complete assignment of their 1H and 13C NMR resonances by 1D and 2D NMR (1H-1H COSY, DEPT 135, HSQC, HMBC, and NOESY) techniques. The derivatives were tested for in vitro anti-proliferative activities against pancreatic cancer PANC-1 cells. Compounds 2, 3, and 4 exhibited more potent activity than did 20(R)-ginsenoside Rg3. 相似文献
8.
A novel series of bis-1,2,4-oxadiazole fused benzothiazole derivatives 9a–9j are synthesized, and their structures are confirmed by 1H and 13C NMR, and mass spectral data. All products are evaluated in vitro for their anticancer potential against a panel of four human cancer cell lines such as lung cancer (A549), breast carcinoma (MCF-7), melanoma (A375), and colon cancer (HT-29). The combretastatin-A4 is used as standard drug. All compounds 9a–9j exhibit significant anticancer activity with IC50 values ranging from 0.11±0.01 to 14.6±3.89 μM. Among these, compounds 9a–9d, 9h, 9i demonstrate more potent activity than the control.
相似文献9.
J. Ellermann J. Schamberger F. A. Knoch M. Moll W. Bauer 《Monatshefte für Chemie / Chemical Monthly》1997,128(4):399-410
Summary 5-Fluoro-uracil (1) reacts with chloro-diphenylphosphane to 5-fluoro-N(1), N(3)-bis(diphenylphosphanyl)uracil (3) which was characterized by X-ray crystallography, IR, and mass spectra.19F,31P{1H},13C{1H}, and1H NMR spectra indicate that3 rearranges inTHF solution to some extent to the tautomeric 5-fluoro-O(2), O(4)-bis(diphenylphosphanyl)uracil (4). If the solvent contains traces of water, Ph2P(O)-PPh2 (6) and uracil derivatives are formed by hydrolysis.
Herrn Professor Dr.Walter Siebert zum 60. Geburtstag gewidmet. 相似文献
10.
《Journal of Coordination Chemistry》2012,65(13):2351-2366
The structure and stoichiometries of the complexes that could be formed between Cu2+ and 3,4-dihydro-3-(2-oxo-2-phenylethylidene)-quinoxalin-2(1H)-one (1) were investigated by various spectral techniques such as IR, fluorescence, UV–vis and electron paramagnetic resonance. The results suggest that initially 3?:?1 and 2?:?1 (1/Cu2+) complexes are formed at low Cu2+ concentration and upon adding more Cu2+, 1?:?1 (preferred) and 1?:?2 complexes are generated. Since 1 possesses two possible binding sites, further exploration was done by testing the binding ability of Cu2+ to fragments of 1, namely β-enaminoketone derivatives (2–3) and quinoxaline-2-one (4), and by executing calculations of thermodynamic parameters of the reaction between 1 and Cu2+ in ethanol, optimized geometries of the possible complexes, and estimation of stability constants at various stoichiometries. Consequently, a step-by-step binding mechanism is suggested for formation of various complexes between 1 and Cu2+. 相似文献
11.
To understand the substitution effects of 3-aminomethyl-pyridine on the reaction equilibrium, the interactions between a series of 3-aminomethyl-pyridine derivatives and peroxovanadium(V) complex [OV(O2)2(D2O)]?/[OV(O2)2(HOD)]? in solution were explored by the combined use of multinuclear (1H, 13C, and 51V) magnetic resonance spectroscopy together with HSQC in 0.15 M NaCl ionic medium for mimicking the physiological conditions. Some direct NMR data are given for the first time. The relative reactivity among the 3-aminomethyl-pyridine derivative ligands are N-(pyridin-3-ylmethyl)acetamide (1) ≈ N-(pyridin-3-ylmethyl)propionamide (2) > N-(pyridin-3-ylmethyl)pivalamide (3) > t-butyl(pyridin-3-ylmethyl)carbamate (4). The competitive coordination results in the formation of a series of new six-coordinate peroxovanadium species [OV(O2)2L]? (L = 1–4). The results of density functional calculations indicated that the solvation effects play an important role in these reactions, providing a reasonable explanation on the relative reactivity of the 3-aminomethyl-pyridine derivatives. 相似文献
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13.
Abstract 1,6-Heptadiyne derivatives containing hydroxy and aromatic substituents, 4-hydroxy-4-phenyl-l,6-heptadiyne (HPHD), 4-hydroxy-4-(4′-methylphenyl)-l,6-heptadiyne (HMHD), and 4-hydroxy-4-(4′-methoxy-phenyl)-l,6-heptadiyne (HMOHD), were prepared and polymerized by various transition metal catalyst systems. A molybdenum complex was found to be the most effective catalyst for the cyclopolymerization of 4-hydroxy-l,6-heptadiyne derivatives. Polymerization of 4-hydroxy-l,6-heptadiyne derivatives by MoCl5-based catalysts gave soluble and highly colored polymers. HMOHD containing the methoxy functional group showed the highest reactivity in cyclopolymerization. The structures of the resulting polymers were elucidated with IR, 1H- and 13C-NMR, and UV-visible spectroscopies. The present polymers were thermally and oxidatively more stable and had higher number-average molecular weights (Mn) of 2 × 104 to 3 ×104 than the corresponding 4-hydroxy-1,6-heptadiyne derivatives containing aliphatic substituents. 相似文献
14.
Abstract Regioisomeric 61, 6n-bis-O-(monomethoxytrityl) or 61, 6n-bis-O-(dimethoxytrityl) cyclomaltohexaose, -cyclomaltoheptaose (n = 2-4), and -cyclomaltooctaose derivatives (n = 2-5) were prepared by the reaction of cyclomaltohexaose (1, cG6, αCD), cyclomaltoheptaose (11, cG7, βCD) or cyclomaltooctaose (21, cG8, γCD) and 4-monomethoxytrityl chloride or 4,4′-dimethoxytrityl chloride in pyridine. Products were isolated by HPLC. The regiochemical determination of these positional isomers was done by converting these compounds to the respective 61, 6n-bis-O-(tert-butyldimethylsilyl) derivatives1 whose structures have been already established. 相似文献
15.
Abbas Tarassoli Ziba Khodamoradpur 《Phosphorus, sulfur, and silicon and the related elements》2013,188(7):1675-1680
Reactions of phosph(V)azane derivatives of bis(anilino)phosphine oxide (PhNH)2P(O)H (1) with AlCl3 and SiCl4 produce two new phosph(V)azane complexes, AlCl[(NPh)2P(O)H] (2) and SiCl2[(NPh)2P(O)H] (3). In these reactions, an HCl elimination occurs and M─N bonds (M = Si, Al) form directly between a bis(anilino)phosphine oxide ligand with aluminum and silicon halides. The reactions do not require any base to deprotonate the phosphazane ligand. The final products have been fully characterized by means of elemental analysis and IR, MS, and multinuclear NMR (1H, 13C, 31P, 27Al, and 29Si) spectroscopy. 相似文献
16.
《Journal of Coordination Chemistry》2012,65(7):1180-1186
Ligand bridged homodinuclear derivatives of bismuth(V) of the type, (1a–1d) [where R =–C(CH3)2CH2CH(CH3)–(1a),–CH(CH2CH3)CH2–(1b),–CH(CH3)CH(CH3)–(1c),–CH(CH3)CH2–(1d)] have been synthesized by reactions of equimolar oxobis(triphenylbismuth)dichloride, {[Ph3Bi]2O}Cl2 with glycols, HOROH in the presence of NaOMe. Reactions of sodiumtetraisopropoxoarsonate, NaAs(OPri)4 with in 1 : 1 molar ratio yielded homodinuclear alkoxo derivatives of arsenic(III) containing glycols, (2a–2d). All compounds were characterized by elemental analysis, molecular weight determinations, IR and NMR (1H and 13C) spectral studies. 相似文献
17.
Kanupriya Sharma Nandu Bala Sharma Anirudh Singh 《Phosphorus, sulfur, and silicon and the related elements》2013,188(12):2735-2744
Equimolar reactions of BuSn(OPri)3 with diethanolamines, RN(CH2CH2 OH) 2 (abbreviated as RdeaH2, where R = H or Me), afford dimeric isopropoxo-bridged six-coordinate butyltin(IV) complexes [{Bu(η3-Rdea)Sn(μ-OPri)}2] (R = H ( 1 ), Me ( 2 )). Interactions between BuSn(OPri)3 and diethanolamines (RdeaH2) in a 1:2 molar ratio yield monomeric derivatives of the type [BuSn(Rdea)(RdeaH)] (R = H ( 3 ), R = Me ( 4 )). These homometallic complexes on 1:1 reactions with an appropriate metal alkoxide form monomeric heterobimetallic complexes of the type [BuSn (Rdea)2 {M(OR′)n}] (R = H, M = Al, R′ = Pri, n = 2 ( 5 ); R = H, M = Ti, R = Pri, n = 3 ( 6 ); R = H, M = Zr, R′ = Pri, n = 3 ( 7 ); R = Me, M = Al, R′ = Pri, n = 2 ( 8 ); R = Me, M = Ti, R′ = Pri, n = 3 ( 9 ); R = Me, M = Ge, R′ = Et, n = 3 ( 10 )). The driving force behind this work was (i) to explore the utility of homometal complexes ( 1 ) –( 4 ) in assembling a metal alkoxide fragment via a condensation reaction and (ii) to gain insights into the structures of new compounds by NMR spectral data. All of these derivatives have been characterized by elemental analysis, spectroscopic (IR, NMR; 1H, 27Al, and 119Sn) studies, and molecular weight measurements. 119Sn NMR spectral studies indicate that both the homometallic ( 3 ) and ( 4 ) and heterobimetallic ( 5 ) – ( 9 ) complexes exist in a solution in an equilibrium of six- and five-coordinated tin(IV) species. 相似文献
18.
Pankaj K. Sharma A. K. Rai Yashpal Singh 《Phosphorus, sulfur, and silicon and the related elements》2013,188(9):2147-2154
The reactions of triphenylantimony(v) isopropoxide with 2,2-disubstituted benzothiazolines in a 1:2 molar ratio in refluxing benzene solution yielded the corresponding triphenylantimony(v) derivatives (1–5) of the type Ph3Sb[SC6H4N: C(R)CH2C(O)R']2, [Where, R═CH3, R'═CH3(1); R═CH3, R'═C6H5(2); R═CH3, R'═4-CH3C6H4(3); R═CH3, R'═4-ClC6H4(4); and R═CF3, R'═C6H5(5)]. All of these newly synthesized derivatives have been characterized by elemental analyses and molecular weight measurements as well as IR and NMR [1H and 13C] spectral studies. On the basis of spectral data, seven-coordination around central antimony atom has been assigned to these derivatives. 相似文献
19.