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Search for "X-ray diffraction analysis" in Full Text gives 160 result(s) in Beilstein Journal of Organic Chemistry.
Self-assembly of Ru4 and Ru8 assemblies by coordination using organometallic Ru(II)2 precursors: Synthesis, characterization and properties
Beilstein J. Org. Chem. 2012, 8, 313–322, doi:10.3762/bjoc.8.34
- salts in high yields and were characterized fully by multinuclear (1H, 13C and 19F) NMR, infrared (IR) and electrospray ionization mass spectrometry (ESIMS). In addition, the molecular structure of macrocycle 2a was established unequivocally by single-crystal X-ray diffraction analysis and adopts a
- -crystal X-ray diffraction analysis, which reveals a tetranuclear geometry with the dimensions of 5.53 Å × 12.39 Å. In addition to their synthesis and characterization, the UV–vis absorption and cyclic voltammetry studies are reported. Results and Discussion Synthesis and characterization of the
- molecular structure of the tetranuclear metallamacrocycle [(p-cymene)4Ru4(μ-η4-oxalato)2(L)]4+(O3SCF3−)4 (2a) was unambiguously determined by single-crystal X-ray diffraction analysis. Single crystals of 2a of high enough quality for X-ray diffraction were grown by slow vapor diffusion of diethyl ether into
Continuous preparation of carbon-nanotube-supported platinum catalysts in a flow reactor directly heated by electric current
Beilstein J. Org. Chem. 2011, 7, 1412–1420, doi:10.3762/bjoc.7.165
- has much higher dispersion. Powder X-ray diffraction analysis was performed to investigate the crystalline structure of the prepared catalysts and the support material. XRD spectra are given in Figure 5. For pristine carbon nanotubes the diffraction peaks at 30.0° and 50.4° can be attributed to the
Functionalization of anthracene: A selective route to brominated 1,4-anthraquinones
Beilstein J. Org. Chem. 2011, 7, 1036–1045, doi:10.3762/bjoc.7.118
- , however, it was difficult to distinguish the exact stereochemistry of symmetrical compounds 7 and 8 by NMR. Therefore, X-ray diffraction analysis was also carried out for 7. The study confirmed the structure of 7 without any ambiguity (Figure 1). Proton and carbon NMR studies indicated that tetrabromide 8
Photoinduced electron-transfer chemistry of the bielectrophoric N-phthaloyl derivatives of the amino acids tyrosine, histidine and tryptophan
Beilstein J. Org. Chem. 2011, 7, 518–524, doi:10.3762/bjoc.7.60
- by X-ray diffraction analysis (Figure 2) [11], has also been described in literature as a yellow compound [12][13]. The color is not the consequence of any impurity and did not vanish after several recrystallizations and, more importantly, was also observed for the methyl ester and the
Tandem catalysis of ring-closing metathesis/atom transfer radical reactions with homobimetallic ruthenium–arene complexes
Beilstein J. Org. Chem. 2010, 6, 1167–1173, doi:10.3762/bjoc.6.133
- NMR tube revealed, however, the formation of a phosphorus-containing precipitate. Suitable crystals for X-ray diffraction analysis were obtained by repeating the RCM experiment on a larger scale in toluene at room temperature. Their structure was solved and assigned to the paramagnetic complex [(p
Anion receptors containing thiazine-1,1-dioxide heterocycles as hydrogen bond donors
Beilstein J. Org. Chem. 2010, 6, No. 50, doi:10.3762/bjoc.6.50
- installation of this subunit in a potential host. The solid-state structures of both newly synthesized receptors were confirmed by X-ray diffraction analysis of single crystals grown by the slow diffusion of isopropyl ether into concentrated DMSO solutions of each (Figure 3). Unfortunately, attempts to co
Acid catalyzed cyclodimerization of 2,2-bis(trifluoromethyl)-4-alkoxy-oxetanes and -thietanes. Synthesis of 2,2,6,6-tetrakis(trifluoromethyl)-4,8-dialkoxy-1,5-dioxocanes and 3,3,7,7-tetrakis(trifluoromethyl)-9-oxa-2,6-dithia-bicyclo[3.3.1]nonane
Beilstein J. Org. Chem. 2010, 6, No. 46, doi:10.3762/bjoc.6.46
- was established by single crystal X-ray diffraction analysis (see Supporting Information File 2). Hydrocarbon oxetanes were reported to react with alcohols under relatively mild conditions [13]. It is interesting, that electron deficient oxetanes 1 also have similar reactivity and rapidly react with
- hexafluoroisopropanol (25 °C, 16 h, NMR) and both 4a and 4b were found to be inert towards BF3·OEt2 (25 °C, 10 h, CH2Cl2, NMR). However, the addition of compounds 4a or 4b to concentrated H2SO4 resulted in an exothermic reaction and formation of a product, which, after single crystal X-ray diffraction analysis, was
Synthesis and binding studies of two new macrocyclic receptors for the stereoselective recognition of dipeptides
Beilstein J. Org. Chem. 2010, 6, No. 5, doi:10.3762/bjoc.6.5
- the formation of the peptide bonds of the macrocyclic structures, both receptors have been isolated as single diastereoisomers. The molecular structure of receptor 1 has been confirmed by single-crystal X-ray diffraction analysis. Although molecular modeling suggested that the cyclic receptors can
The enantiospecific synthesis of (+)-monomorine I using a 5-endo- trig cyclisation strategy
Beilstein J. Org. Chem. 2007, 3, No. 39, doi:10.1186/1860-5397-3-39
- epimeric pairs proved problematic due to difficulties encountered during separation, and the presence of overlapping signals in the 1H NMR spectrum. Finally, a combination of X-ray diffraction analysis and comparison of the 1H NMR showed that the major diastereoisomer in each case was the undesired C-5
Diastereoselective synthesis of some novel benzopyranopyridine derivatives
Beilstein J. Org. Chem. 2006, 2, No. 25, doi:10.1186/1860-5397-2-25
- determined as S,S by X-ray diffraction analysis (Figure 4) (For details see also: Figure 4 and Supporting Information File 1). Structure elucidation of 5b The mass spectrum of 5b displayed a molecular ion at m/z 245 corresponding to the molecular formula C14H15NO3. Interestingly the molecular ion is 18 amu
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