organic compounds
n-Propyl 2,3,4,6-tetra-O-acetyl-β-D-glucopyranoside
aBAM Federal Institute for Materials Research and Testing, Department of Analytical Chemistry, Reference Materials, Richard-Willstätter-Strasse 11, D-12489 Berlin, Germany
*Correspondence e-mail: franziska.emmerling@bam.de
The title compound [systematic name: (2R,3R,4S,5R,6R)-2-(acetoxymethyl)-6-propoxytetrahydro-2H-pyran-3,4,5-triyl triacetate], C17H26O10, was formed by a Koenigs–Knorr reaction of 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide and n-propanol. The central ring adopts a chair conformation. The crystal does not contain any significant interactions such as hydrogen bonds.
Related literature
Metabolites of alcohol are important markers for previous alcohol consumption, see: Joya et al. (2012); Helander et al. (2012). For the investigation of the short-chain alkyl alcohol content in alcoholic beverages, see: Lachenmeier & Musshoff (2004). For the relevance of short-chain alkyl alcohol glucuronides as alcohol markers, see: Sticht & Käferstein (1999). For related synthesis, see: Baer & Abbas (1979).
Experimental
Crystal data
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Data collection: APEX2 (Bruker, 2001); cell SAINT (Bruker, 2001); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008) and ORTEPIII (Burnett & Johnson,1996); software used to prepare material for publication: SHELXTL.
Supporting information
10.1107/S1600536812051495/bt6871sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536812051495/bt6871Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536812051495/bt6871Isup3.mol
n-Propyl 2,3,4,6-tetra-O-acetyl-β-D-glucopyranoside was synthesized by a Koenigs-Knorr-reaction of 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide and n-propanol. In order to obtain crystals suitable for single-crystal analysis, about 10 mg were dissolved in 2 ml i-propanol. Colourless crystals of the title compound were formed after 4 days of slow solvent evaporation at room temperature.
All H-atoms were positioned geometrically and refined using a riding model with d(C—H) = 0.93 Å, Uiso=1.2Ueq (C) for aromatic 0.98 Å, Uiso = 1.2Ueq (C) for CH, 0.97 Å, Uiso = 1.2Ueq (C) for CH2, 0.96 Å, Uiso = 1.5Ueq (C) for CH3 hydrogen atoms. In the absence of significant
effects 1815 Friedel pairs were merged. The has not been determined by anomalous-dispersion effects in diffraction measurements of the crystal. The conformation has been assigned due to an unchanging chiral centre in the synthetic procedure.Data collection: APEX2 (Bruker, 2001); cell
SAINT (Bruker, 2001); data reduction: SAINT (Bruker, 2001); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008) and ORTEPIII (Burnett & Johnson,1996); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. ORTEP representation of the title compound with atomic labeling shown with 30% probability displacement ellipsoids. | |
Fig. 2. View of the unit cell of the title compound along the a axis. |
C17H26O10 | F(000) = 832 |
Mr = 390.38 | Dx = 1.242 Mg m−3 |
Orthorhombic, P212121 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 1756 reflections |
a = 7.0072 (11) Å | θ = 2.5–20.6° |
b = 15.215 (3) Å | µ = 0.10 mm−1 |
c = 19.579 (3) Å | T = 296 K |
V = 2087.4 (6) Å3 | Block, colourless |
Z = 4 | 0.47 × 0.41 × 0.12 mm |
Bruker APEXII CCD diffractometer | 2444 independent reflections |
Radiation source: fine-focus sealed tube | 1286 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.094 |
ϕ and ω scans | θmax = 26.4°, θmin = 1.7° |
Absorption correction: multi-scan (SADABS; Bruker, 2001) | h = −8→8 |
Tmin = 0.152, Tmax = 0.326 | k = −14→19 |
12995 measured reflections | l = −22→24 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.044 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.122 | H-atom parameters constrained |
S = 0.87 | w = 1/[σ2(Fo2) + (0.0473P)2] where P = (Fo2 + 2Fc2)/3 |
2444 reflections | (Δ/σ)max < 0.001 |
244 parameters | Δρmax = 0.15 e Å−3 |
0 restraints | Δρmin = −0.13 e Å−3 |
C17H26O10 | V = 2087.4 (6) Å3 |
Mr = 390.38 | Z = 4 |
Orthorhombic, P212121 | Mo Kα radiation |
a = 7.0072 (11) Å | µ = 0.10 mm−1 |
b = 15.215 (3) Å | T = 296 K |
c = 19.579 (3) Å | 0.47 × 0.41 × 0.12 mm |
Bruker APEXII CCD diffractometer | 2444 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2001) | 1286 reflections with I > 2σ(I) |
Tmin = 0.152, Tmax = 0.326 | Rint = 0.094 |
12995 measured reflections |
R[F2 > 2σ(F2)] = 0.044 | 0 restraints |
wR(F2) = 0.122 | H-atom parameters constrained |
S = 0.87 | Δρmax = 0.15 e Å−3 |
2444 reflections | Δρmin = −0.13 e Å−3 |
244 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
O1 | −0.5821 (4) | −0.44666 (15) | 0.11382 (11) | 0.0723 (7) | |
O2 | −0.4530 (6) | −0.5422 (2) | 0.18823 (14) | 0.1102 (11) | |
O3 | −0.2268 (3) | −0.39673 (15) | 0.05183 (11) | 0.0658 (6) | |
O4 | −0.2904 (6) | −0.25348 (18) | 0.03622 (15) | 0.1102 (11) | |
O5 | −0.2593 (4) | −0.39896 (14) | −0.09808 (11) | 0.0669 (7) | |
O6 | 0.0304 (4) | −0.4603 (2) | −0.10821 (15) | 0.0957 (9) | |
O7 | −0.5722 (4) | −0.57770 (15) | −0.04254 (12) | 0.0729 (7) | |
O8 | −0.7407 (4) | −0.59780 (17) | 0.05611 (13) | 0.0857 (8) | |
O9 | −0.2672 (4) | −0.62575 (15) | −0.12723 (11) | 0.0738 (7) | |
O10 | −0.2239 (5) | −0.6686 (2) | −0.23468 (15) | 0.1215 (12) | |
C1 | −0.5591 (7) | −0.4835 (3) | 0.17671 (19) | 0.0767 (11) | |
C2 | −0.6884 (7) | −0.4384 (3) | 0.22700 (18) | 0.1032 (15) | |
H2A | −0.6717 | −0.4641 | 0.2714 | 0.155* | |
H2B | −0.8187 | −0.4453 | 0.2128 | 0.155* | |
H2C | −0.6574 | −0.3770 | 0.2289 | 0.155* | |
C3 | −0.4973 (5) | −0.4916 (2) | 0.05674 (16) | 0.0597 (9) | |
H3A | −0.4081 | −0.5364 | 0.0733 | 0.072* | |
C4 | −0.3908 (5) | −0.4247 (2) | 0.01340 (16) | 0.0591 (9) | |
H4A | −0.4734 | −0.3744 | 0.0034 | 0.071* | |
C5 | −0.1930 (7) | −0.3094 (3) | 0.06182 (19) | 0.0737 (11) | |
C6 | −0.0292 (7) | −0.2960 (3) | 0.1081 (2) | 0.0915 (14) | |
H6A | −0.0080 | −0.2342 | 0.1143 | 0.137* | |
H6B | 0.0827 | −0.3224 | 0.0885 | 0.137* | |
H6C | −0.0558 | −0.3228 | 0.1514 | 0.137* | |
C7 | −0.3248 (5) | −0.4675 (2) | −0.05259 (15) | 0.0560 (9) | |
H7A | −0.2198 | −0.5082 | −0.0429 | 0.067* | |
C8 | −0.0781 (6) | −0.4022 (3) | −0.12245 (17) | 0.0685 (10) | |
C9 | −0.0396 (7) | −0.3275 (3) | −0.16879 (19) | 0.0945 (14) | |
H9A | 0.0885 | −0.3317 | −0.1859 | 0.142* | |
H9B | −0.0545 | −0.2733 | −0.1443 | 0.142* | |
H9C | −0.1277 | −0.3290 | −0.2063 | 0.142* | |
C10 | −0.4873 (5) | −0.5170 (2) | −0.08911 (17) | 0.0639 (10) | |
H10A | −0.5840 | −0.4746 | −0.1040 | 0.077* | |
C11 | −0.6544 (6) | −0.5349 (3) | 0.01541 (18) | 0.0699 (10) | |
H11A | −0.7481 | −0.4910 | 0.0007 | 0.084* | |
C12 | −0.9385 (8) | −0.6126 (4) | 0.0406 (3) | 0.135 (2) | |
H12A | −1.0041 | −0.5565 | 0.0400 | 0.162* | |
H12B | −0.9480 | −0.6377 | −0.0048 | 0.162* | |
C13 | −1.0301 (9) | −0.6678 (5) | 0.0862 (4) | 0.162 (3) | |
H13A | −0.9848 | −0.7270 | 0.0775 | 0.195* | |
H13B | −1.1649 | −0.6670 | 0.0750 | 0.195* | |
C14 | −1.0134 (8) | −0.6520 (4) | 0.1606 (3) | 0.163 (3) | |
H14A | −1.0800 | −0.6974 | 0.1849 | 0.245* | |
H14B | −1.0682 | −0.5960 | 0.1716 | 0.245* | |
H14C | −0.8812 | −0.6525 | 0.1735 | 0.245* | |
C15 | −0.4194 (6) | −0.5683 (3) | −0.14971 (17) | 0.0765 (11) | |
H15A | −0.5234 | −0.6027 | −0.1686 | 0.092* | |
H15B | −0.3731 | −0.5288 | −0.1848 | 0.092* | |
C16 | −0.1777 (7) | −0.6732 (3) | −0.1757 (2) | 0.0798 (12) | |
C17 | −0.0204 (7) | −0.7261 (3) | −0.1465 (2) | 0.0987 (15) | |
H17A | 0.0397 | −0.7594 | −0.1822 | 0.148* | |
H17B | −0.0704 | −0.7654 | −0.1126 | 0.148* | |
H17C | 0.0718 | −0.6877 | −0.1258 | 0.148* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0767 (17) | 0.0846 (17) | 0.0556 (14) | 0.0178 (15) | 0.0109 (13) | 0.0092 (12) |
O2 | 0.130 (3) | 0.124 (3) | 0.0759 (18) | 0.050 (3) | 0.0144 (18) | 0.0268 (17) |
O3 | 0.0678 (16) | 0.0658 (15) | 0.0638 (14) | 0.0028 (14) | −0.0051 (13) | 0.0010 (12) |
O4 | 0.149 (3) | 0.0707 (18) | 0.110 (2) | 0.010 (2) | −0.029 (2) | −0.0002 (18) |
O5 | 0.0688 (17) | 0.0688 (16) | 0.0631 (14) | 0.0136 (14) | 0.0140 (13) | 0.0154 (12) |
O6 | 0.0701 (19) | 0.115 (2) | 0.102 (2) | 0.0170 (19) | 0.0162 (16) | 0.0149 (18) |
O7 | 0.0765 (17) | 0.0740 (16) | 0.0683 (15) | −0.0015 (15) | 0.0013 (14) | −0.0006 (13) |
O8 | 0.0682 (18) | 0.101 (2) | 0.0875 (18) | −0.0126 (16) | −0.0038 (15) | 0.0267 (16) |
O9 | 0.0829 (19) | 0.0780 (16) | 0.0605 (14) | 0.0182 (15) | −0.0064 (14) | −0.0084 (13) |
O10 | 0.137 (3) | 0.159 (3) | 0.0689 (18) | 0.028 (3) | −0.001 (2) | −0.029 (2) |
C1 | 0.076 (3) | 0.096 (3) | 0.058 (2) | 0.013 (3) | 0.006 (2) | 0.011 (2) |
C2 | 0.114 (4) | 0.135 (4) | 0.061 (2) | 0.024 (4) | 0.019 (3) | 0.004 (2) |
C3 | 0.057 (2) | 0.066 (2) | 0.0557 (19) | 0.0087 (18) | 0.0038 (19) | 0.0036 (18) |
C4 | 0.059 (2) | 0.061 (2) | 0.058 (2) | 0.0083 (19) | 0.0021 (18) | 0.0073 (17) |
C5 | 0.091 (3) | 0.068 (3) | 0.062 (2) | −0.003 (2) | 0.009 (2) | 0.005 (2) |
C6 | 0.101 (4) | 0.096 (3) | 0.078 (3) | −0.021 (3) | −0.007 (3) | −0.001 (2) |
C7 | 0.060 (2) | 0.057 (2) | 0.0511 (18) | 0.0119 (18) | 0.0043 (18) | 0.0055 (17) |
C8 | 0.067 (3) | 0.084 (3) | 0.054 (2) | 0.001 (3) | 0.005 (2) | −0.001 (2) |
C9 | 0.107 (4) | 0.103 (3) | 0.073 (2) | −0.023 (3) | 0.015 (3) | 0.013 (2) |
C10 | 0.063 (2) | 0.073 (2) | 0.0561 (19) | 0.015 (2) | −0.0013 (19) | 0.0080 (19) |
C11 | 0.063 (2) | 0.078 (3) | 0.069 (2) | 0.002 (2) | 0.002 (2) | 0.016 (2) |
C12 | 0.094 (4) | 0.177 (6) | 0.134 (4) | −0.059 (4) | −0.025 (4) | 0.040 (4) |
C13 | 0.084 (4) | 0.224 (7) | 0.179 (6) | −0.038 (5) | −0.009 (4) | 0.065 (6) |
C14 | 0.100 (5) | 0.213 (7) | 0.176 (6) | 0.017 (5) | 0.048 (5) | 0.083 (6) |
C15 | 0.084 (3) | 0.087 (3) | 0.059 (2) | 0.011 (3) | −0.011 (2) | −0.0033 (19) |
C16 | 0.086 (3) | 0.087 (3) | 0.067 (3) | −0.002 (3) | 0.006 (2) | −0.013 (2) |
C17 | 0.105 (4) | 0.094 (3) | 0.097 (3) | 0.024 (3) | 0.004 (3) | −0.015 (3) |
O1—C1 | 1.362 (4) | C6—H6B | 0.9600 |
O1—C3 | 1.439 (4) | C6—H6C | 0.9600 |
O2—C1 | 1.184 (5) | C7—C10 | 1.540 (5) |
O3—C5 | 1.364 (4) | C7—H7A | 0.9800 |
O3—C4 | 1.438 (4) | C8—C9 | 1.479 (5) |
O4—C5 | 1.200 (5) | C9—H9A | 0.9600 |
O5—C8 | 1.357 (5) | C9—H9B | 0.9600 |
O5—C7 | 1.447 (3) | C9—H9C | 0.9600 |
O6—C8 | 1.199 (4) | C10—C15 | 1.498 (5) |
O7—C10 | 1.428 (4) | C10—H10A | 0.9800 |
O7—C11 | 1.429 (4) | C11—H11A | 0.9800 |
O8—C11 | 1.384 (4) | C12—C13 | 1.384 (7) |
O8—C12 | 1.437 (5) | C12—H12A | 0.9700 |
O9—C16 | 1.347 (4) | C12—H12B | 0.9700 |
O9—C15 | 1.447 (4) | C13—C14 | 1.480 (7) |
O10—C16 | 1.202 (4) | C13—H13A | 0.9700 |
C1—C2 | 1.503 (6) | C13—H13B | 0.9700 |
C2—H2A | 0.9600 | C14—H14A | 0.9600 |
C2—H2B | 0.9600 | C14—H14B | 0.9600 |
C2—H2C | 0.9600 | C14—H14C | 0.9600 |
C3—C11 | 1.517 (5) | C15—H15A | 0.9700 |
C3—C4 | 1.521 (5) | C15—H15B | 0.9700 |
C3—H3A | 0.9800 | C16—C17 | 1.479 (6) |
C4—C7 | 1.519 (4) | C17—H17A | 0.9600 |
C4—H4A | 0.9800 | C17—H17B | 0.9600 |
C5—C6 | 1.476 (6) | C17—H17C | 0.9600 |
C6—H6A | 0.9600 | ||
C1—O1—C3 | 117.3 (3) | C8—C9—H9C | 109.5 |
C5—O3—C4 | 120.2 (3) | H9A—C9—H9C | 109.5 |
C8—O5—C7 | 119.2 (3) | H9B—C9—H9C | 109.5 |
C10—O7—C11 | 112.3 (3) | O7—C10—C15 | 107.5 (3) |
C11—O8—C12 | 114.1 (3) | O7—C10—C7 | 109.1 (3) |
C16—O9—C15 | 116.9 (3) | C15—C10—C7 | 112.8 (3) |
O2—C1—O1 | 123.8 (4) | O7—C10—H10A | 109.1 |
O2—C1—C2 | 126.7 (4) | C15—C10—H10A | 109.1 |
O1—C1—C2 | 109.5 (4) | C7—C10—H10A | 109.1 |
C1—C2—H2A | 109.5 | O8—C11—O7 | 108.6 (3) |
C1—C2—H2B | 109.5 | O8—C11—C3 | 108.1 (3) |
H2A—C2—H2B | 109.5 | O7—C11—C3 | 109.2 (3) |
C1—C2—H2C | 109.5 | O8—C11—H11A | 110.3 |
H2A—C2—H2C | 109.5 | O7—C11—H11A | 110.3 |
H2B—C2—H2C | 109.5 | C3—C11—H11A | 110.3 |
O1—C3—C11 | 108.7 (3) | C13—C12—O8 | 114.0 (5) |
O1—C3—C4 | 108.6 (3) | C13—C12—H12A | 108.8 |
C11—C3—C4 | 110.4 (3) | O8—C12—H12A | 108.8 |
O1—C3—H3A | 109.7 | C13—C12—H12B | 108.8 |
C11—C3—H3A | 109.7 | O8—C12—H12B | 108.8 |
C4—C3—H3A | 109.7 | H12A—C12—H12B | 107.7 |
O3—C4—C7 | 109.2 (3) | C12—C13—C14 | 120.0 (6) |
O3—C4—C3 | 107.3 (3) | C12—C13—H13A | 107.3 |
C7—C4—C3 | 109.7 (3) | C14—C13—H13A | 107.3 |
O3—C4—H4A | 110.2 | C12—C13—H13B | 107.3 |
C7—C4—H4A | 110.2 | C14—C13—H13B | 107.3 |
C3—C4—H4A | 110.2 | H13A—C13—H13B | 106.9 |
O4—C5—O3 | 122.1 (4) | C13—C14—H14A | 109.5 |
O4—C5—C6 | 126.9 (4) | C13—C14—H14B | 109.5 |
O3—C5—C6 | 110.9 (4) | H14A—C14—H14B | 109.5 |
C5—C6—H6A | 109.5 | C13—C14—H14C | 109.5 |
C5—C6—H6B | 109.5 | H14A—C14—H14C | 109.5 |
H6A—C6—H6B | 109.5 | H14B—C14—H14C | 109.5 |
C5—C6—H6C | 109.5 | O9—C15—C10 | 107.9 (3) |
H6A—C6—H6C | 109.5 | O9—C15—H15A | 110.1 |
H6B—C6—H6C | 109.5 | C10—C15—H15A | 110.1 |
O5—C7—C4 | 108.1 (2) | O9—C15—H15B | 110.1 |
O5—C7—C10 | 107.5 (2) | C10—C15—H15B | 110.1 |
C4—C7—C10 | 112.3 (3) | H15A—C15—H15B | 108.4 |
O5—C7—H7A | 109.6 | O10—C16—O9 | 121.3 (4) |
C4—C7—H7A | 109.6 | O10—C16—C17 | 127.1 (4) |
C10—C7—H7A | 109.6 | O9—C16—C17 | 111.5 (3) |
O6—C8—O5 | 122.5 (3) | C16—C17—H17A | 109.5 |
O6—C8—C9 | 126.4 (4) | C16—C17—H17B | 109.5 |
O5—C8—C9 | 111.0 (4) | H17A—C17—H17B | 109.5 |
C8—C9—H9A | 109.5 | C16—C17—H17C | 109.5 |
C8—C9—H9B | 109.5 | H17A—C17—H17C | 109.5 |
H9A—C9—H9B | 109.5 | H17B—C17—H17C | 109.5 |
Experimental details
Crystal data | |
Chemical formula | C17H26O10 |
Mr | 390.38 |
Crystal system, space group | Orthorhombic, P212121 |
Temperature (K) | 296 |
a, b, c (Å) | 7.0072 (11), 15.215 (3), 19.579 (3) |
V (Å3) | 2087.4 (6) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.47 × 0.41 × 0.12 |
Data collection | |
Diffractometer | Bruker APEXII CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 2001) |
Tmin, Tmax | 0.152, 0.326 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 12995, 2444, 1286 |
Rint | 0.094 |
(sin θ/λ)max (Å−1) | 0.625 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.044, 0.122, 0.87 |
No. of reflections | 2444 |
No. of parameters | 244 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.15, −0.13 |
Computer programs: APEX2 (Bruker, 2001), SAINT (Bruker, 2001), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008) and ORTEPIII (Burnett & Johnson,1996), SHELXTL (Sheldrick, 2008).
References
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Bruker (2001). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
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In recent years the determination of alcohol metabolites gained importance for screening previous alcohol consumption (Joya et al., Helander et al., 2012). Beside ethanol several short-chain alkyl alcohols, e.g. n-propanol, are found in alcoholic beverages as a result of fermentation process (Lachenmeier & Musshoff, 2004). The glucuronides of these so-called fusel alcohols are interesting markers for the consumption of alcohol (Sticht & Käferstein, 1999). So the analysis of these glucuronic metabolites, including their synthesis and full characterization is mandatory. The compound was formed by a Koenigs-Knorr-reaction of 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide and n-propanol (related synthesis Baer & Abbas, 1979) as an intermediate product towards synthesis of n-propyl-glucuronide.
The central ring has a chair conformation (Fig 1). One side chain of the molecule shows a small tendency to disorder, indicated in the ORTEP representation. This disorder leads to an unusual short contact C12—C13 (1.38 Å). The absolute configuration could not be defined confidently based on the single-crystal diffraction data. The isomeric purity of the title compound was confirmed by 1H-NMR.