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- W2056542141 abstract "13C NMR chemical shifts have been measured and assigned for epimeric methyl 3α/β-hydroxy-5β-cholan-24-oates (methyl lithocholate [3α-OH epimer] and methyl iso-lithocholate [3β-OH epimer]). Their molecular dynamics simulations suggest that for both epimers there exists two predominant gas phase conformations, which have been further forwarded for ab initio/HF optimizations and DFT/GIAO based 13C NMR chemical shift calculations. Excellent linear relationships have been observed between experimental and calculated 13C NMR chemical shifts for both epimers. For methyl lithocholate (MeLC), the other minimum energy conformation equates very well with the single crystal X-ray structure (orthorhombic, space group P212121, unit cell a=7.14710(10)Å, b=11.9912(2)Å, c=26.4368(5)Å). The crystalline packing of MeLC consists of continuous parallel intermolecular hydrogen bonded [3α-OH⋯OC24] head-to-tail polymeric chains, which are further cross-linked by many simultaneous weak C(sp3)H⋯O-type of interactions." @default.
- W2056542141 created "2016-06-24" @default.
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- W2056542141 date "2003-04-01" @default.
- W2056542141 modified "2023-09-24" @default.
- W2056542141 title "Comparison of epimeric methyl lithocholate and methyl iso-lithocholate molecules: single crystal X-ray structure of methyl lithocholate, ab initio HF/6-31G* optimized structures and experimental and calculated DFT/B3LYP 13C NMR chemical shifts" @default.
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- W2056542141 doi "https://doi.org/10.1016/s0022-2860(02)00476-3" @default.
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