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Search for "NMR characterization" in Full Text gives 32 result(s) in Beilstein Journal of Organic Chemistry.
Two strategies for the synthesis of the biologically important ATP analogue ApppI, at a multi-milligram scale
Beilstein J. Org. Chem. 2015, 11, 2189–2193, doi:10.3762/bjoc.11.237
- any NMR characterization data, only HPLC and MS data were presented, and these are rather unsatisfactory methods with which to prove the purity of a product. They also stated that there was 5–10% ADP (adenosine diphosphate) as an impurity in some preparations and that it is possible that there may
Micro-flow synthesis and structural analysis of sterically crowded diimine ligands with five aryl rings
Beilstein J. Org. Chem. 2013, 9, 2336–2343, doi:10.3762/bjoc.9.268
- synthesized ligands were mixed in CH2Cl2 and stirred for 4 h at room temperature. Free ligands 3b or 3c were not observed by 1H NMR analysis of the obtained crude mixtures. NMR characterization of the complexes 12 and 13 was poor due to the paramagnetic nature of the pseudo-tetrahedral nickel centers. In the
Synthesis of conformationally restricted glutamate and glutamine derivatives from carbonylation of orthopalladated phenylglycine derivatives
Beilstein J. Org. Chem. 2012, 8, 1569–1575, doi:10.3762/bjoc.8.179
- carbonylation reaction. Synthesis of methyl (1H)-isoindolin-1-one-3-carboxylates by carbonylation of phenylglycine derivatives [12]. Synthesis and NMR characterization of orthometallated complex 3. Carbonylation of 1 to afford glutamate and glutamine derivatives 2a–j. Reaction of 1 and CO in CH2Cl2 [18
An easy α-glycosylation methodology for the synthesis and stereochemistry of mycoplasma α-glycolipid antigens
Beilstein J. Org. Chem. 2012, 8, 629–639, doi:10.3762/bjoc.8.70
- O-benzyl group by catalytic hydrogenolysis, the GGPL-I homologue I-a was obtained. In the same way, the GGPL-I sn-isomer I-b was derived from a mixture of 4b and 5b available from the reaction between 1 and (R)-glycidol (Scheme 1 and Scheme 2b). 1H NMR characterization of I-a, I-b and the related
Long-range diastereoselectivity in Ugi reactions of 2-substituted dihydrobenzoxazepines
Beilstein J. Org. Chem. 2011, 7, 976–979, doi:10.3762/bjoc.7.109
- influence on the diastereoselectivity. NMR characterization of the products is reported in Supporting Information File 2. Minimization of the cyclic imine 5a using CSC Chem3D (v10) indicates that there are only two significant conformations, and that the one with the substituent at C-2 in the equatorial
- . Results of Ugi reactions of imines 5a,b. Supporting Information Supporting Information File 133: Complete experimental procedures. Supporting Information File 134: NMR characterization of products 6 and NMR spectra. Acknowledgements We wish to thank Benedetta Pollarolo for her collaboration to this work
Poly(glycolide) multi-arm star polymers: Improved solubility via limited arm length
Beilstein J. Org. Chem. 2010, 6, No. 67, doi:10.3762/bjoc.6.67
- star copolymers. Acknowledgements Florian Wolf acknowledges the IMPRS (International Max Planck-Research School) of the Max Planck Society for continuous support. The authors thank Heinz Kolshorn for his valuable help with the detailed NMR characterization of the materials. Holger Frey acknowledges
1-(4-Alkyloxybenzyl)-3-methyl-1H-imidazol-3-ium organic backbone: A versatile smectogenic moiety
Beilstein J. Org. Chem. 2009, 5, No. 62, doi:10.3762/bjoc.5.62
- analysis. Due to their close chemical structures, similar behaviour was observed during NMR characterization for all 1n samples as a function of concentration. A significant chemical shift related to the proton of the imidazolium head (Him), and in particular a Δδ = 0.43 ppm (from low to high concentration
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