โ Scribed by K. Takegoshi; C.A. McDowell
No coin nor oath required. For personal study only.
The orientations of the principal axes of the 13C chemical shielding tensor of the double-bonded C5 carbon nucleus in smgle crystals of 1,1,2,2-tetraacetylethane are essentially identical with those of an aromatIc carbon nucleus. That observation and the similarities between the tensors of the carbonyl and the enolic carbon nuctei result from strong intramolecular hydrogen bonding.
๐ SIMILAR VOLUMES
The chemical shielding tensors and their direction cosines of the "C nuclei in a single crystal of methyl cr-D-glucopyranoside were determined by the high-resolution solid state n.m.r. technique. The results were used to assign the 13C cross-polarization, magic angle spinning (c.p.-m.a.s.) spectrum
The anisotropies, Atr, of the ]H and 13C nuclear shielding tensors of chloroform were determined experimentally and theoretically. The liquid crystal NMR ENEMIX method gives Ao" c = --51.8 to --51.4 ppm in excellent agreement with ab initio GIAO SCF/MCSCF calculations resulting in -51 ppm, preferrin