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NMR Spectroscopy and Conformational Features

Carbohydrate Chemistry, Royal Society of Chemistry, vol. 31, 2000 R41 Anonymous (U.K.), NMR Spectroscopy and Conformational Features , p. 312... [Pg.4]

Novel cationic methyl and neutral methyl, chloro Pd11 complexes have been synthesized with various functionalized imidazole ligands. For the first time, structurally characterized examples of this type of Pd complex could be obtained. The chelate ligand is shown to adopt a boat conformation. Inversion of the chelate ring was established by NMR spectroscopy. Depending on electronic and steric features of the ligand, the complexes can act as catalysts in the CO/ethylene as well as the Fleck reaction.186... [Pg.568]

Carbon-13 NMR spectroscopy has also been utilized to probe the structure, isomers, and conformational aspects of 1,2,5-oxadiazole chemistry. The dc values for monocyclic furazans vary from 140 to 160 ppm depending on the substituent, and C- H couplings of ca. 200 Hz are observed for the parent furazan and monosubstituted derivatives (92KGS1 lOl >. For furoxans the most noteworthy feature of their carbon spectra is the large displacement of the C(3) resonance to lower chemical shift. While the C(4) peak remains in the range 140-160 ppm that for C(3) is shifted to 100-125 ppm. At low temperatures benzofuroxan shows two peaks at 113.7 (C(3)) and 152.2 (C(4)) which coalesce on warming. The parent furoxan has C- H couplings of 211 Hz for C(3) and 202 Hz for... [Pg.233]

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Conformation spectroscopy

NMR and Conformations

NMR conformation

Spectroscopy and Conformational Features

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