organic compounds\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

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ISSN: 2414-3146

2-De­­oxy-D-galactitol

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aGraduate School of Science for Creative Emergence, Kagawa University, 2217-20 Hayashi-cho, Takamatsu, Kagawa 761-0396, Japan, and bDepartment of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki, Kagawa 761-0795, Japan
*Correspondence e-mail: [email protected]

Edited by L. Van Meervelt, Katholieke Universiteit Leuven, Belgium (Received 28 July 2026; accepted 3 August 2026; online 7 August 2026)

2-De­oxy-D-galactitol, C6H14O5, was prepared by reduction of 2-de­oxy-D-galactose with sodium borohydride (NaBH4) and crystallized from aqueous solution. Colorless block-shaped crystals suitable for single-crystal X-ray diffraction were obtained. The title compound crystallizes in the triclinic space group P1, with two crystallographically independent mol­ecules in the asymmetric unit. In the crystal, the mol­ecules are linked by O—H⋯O hydrogen bonds, forming a three-dimensional hydrogen-bonded network.

3D view (loading...)
[Scheme 3D1]
Chemical scheme
[Scheme 1]

Structure description

De­oxy sugars are carbohydrates in which one or more hy­droxy groups are replaced by hydrogen atoms. They occur in biological systems as components of physiologically important compounds; for example, 2-de­oxy-D-ribose forms part of the structural backbone of DNA (Nuevo et al., 2018View full citation). De­oxy sugars have also attracted considerable inter­est because of their potential applications in pharmaceutical and agricultural fields. For example, 2-de­oxy-D-glucose and its analogues have been investigated as diagnostic and therapeutic agents (Pajak et al., 2020View full citation), whereas 7-de­oxy-sedoheptulose has been investigated as a natural herbicidal agent (Brilisauer et al., 2019View full citation). The title compound, C6H14O5, is a sugar alcohol obtained by reduction of the aldehyde group of 2-de­oxy-D-galactose. In the present study, single crystals of 2-de­oxy-D-galactitol were prepared to determine its crystal structure and characterize its inter­molecular inter­actions.

The title compound crystallizes in the triclinic space group P1. The asymmetric unit contains two crystallographically independent mol­ecules (Fig. 1[link]) of 2-de­oxy-D-galactitol, which adopt very similar conformations, with an r.m.s. deviation of 0.530 Å after least-squares fitting. The stereogenic centres at C3, C4 and C5 in one molecule and at C9, C10 and C11 in the other molecule all have S configurations.

[Figure 1]
Figure 1
The title compound, showing the atom-labeling scheme. Displacement ellipsoids are drawn at the 50% probability level, and hydrogen atoms are shown as spheres of arbitrary radius. The O7—H7⋯O2 hydrogen bond is shown as a dashed line.

In the crystal, the mol­ecules are linked by the O—H⋯O hydrogen bonds listed in Table 1[link], with O⋯O distances ranging from 2.669 (4) to 2.872 (4) Å. These inter­actions connect the two crystallographically independent mol­ecules to surrounding symmetry-related mol­ecules, generating a three-dimensional hydrogen-bonded network. For clarity, the molecule containing atoms C1–C6/O1–O5 is designated A, and that containing atoms C7–C12/O6–O10 is designated B. The hydrogen-bonded network comprises two AA, two BB and five AB hydrogen bonds. A partial packing diagram showing the nine crystallographically distinct hydrogen bonds is presented in Fig. 2[link].

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A D—H H⋯A DA D—H⋯A
O1—H1⋯O6i 0.82 1.99 2.809 (4) 175
O2—H2⋯O5ii 0.82 1.85 2.669 (4) 172
O3—H3⋯O1iii 0.82 1.87 2.683 (4) 172
O4—H4⋯O6iv 0.82 2.06 2.871 (4) 168
O5—H5⋯O10iii 0.82 1.88 2.697 (4) 173
O6—H6⋯O8iii 0.82 1.95 2.764 (4) 176
O7—H7⋯O2 0.82 1.90 2.717 (4) 174
O8—H8⋯O3v 0.82 1.95 2.752 (4) 168
O10—H10⋯O7ii 0.82 1.87 2.685 (4) 176
Symmetry codes: (i) Mathematical equation; (ii) Mathematical equation; (iii) Mathematical equation; (iv) Mathematical equation; (v) Mathematical equation.
[Figure 2]
Figure 2
Partial crystal packing of the title compound, showing the nine crystallographically distinct O—H⋯O hydrogen bonds listed in Table 1[link]. The two crystallographically independent mol­ecules in the asymmetric unit are shown in a ball-and-stick representation, and the surrounding symmetry-related mol­ecules are shown in a stick representation. Hydrogen bonds are shown as cyan dashed lines.

Synthesis and crystallization

2-De­oxy-D-galactitol was prepared by reduction of 2-de­oxy-D-galactose with sodium borohydride (NaBH4). Following purification, the product was dissolved in water, and the solution was allowed to evaporate slowly at room temperature. Colorless block-shaped single crystals suitable for single-crystal X-ray diffraction analysis were obtained.

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2[link]. The absolute configuration was assigned on the basis of the known configuration of the 2-de­oxy-D-galactose starting material and the synthetic route.

Table 2
Experimental details

Crystal data
Chemical formula C6H14O5
Mr 166.17
Crystal system, space group Triclinic, P1
Temperature (K) 296
a, b, c (Å) 5.5249 (3), 8.0330 (4), 9.9771 (5)
α, β, γ (°) 108.091 (3), 107.597 (3), 93.072 (3)
V3) 395.86 (4)
Z 2
Radiation type Cu Kα
μ (mm−1) 1.05
Crystal size (mm) 0.10 × 0.10 × 0.10
 
Data collection
Diffractometer Rigaku R-AXIS RAPID
Absorption correction Multi-scan (ABSCOR; Rigaku, 1995View full citation)
Tmin, Tmax 0.666, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections 7108, 2577, 2115
Rint 0.054
(sin θ/λ)max−1) 0.602
 
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.040, 0.102, 1.11
No. of reflections 2577
No. of parameters 209
No. of restraints 3
H-atom treatment H-atom parameters constrained
Δρmax, Δρmin (e Å−3) 0.20, −0.26
Absolute structure Flack x determined using 741 quotients [(I+)−(I)]/[(I+)+(I)] (Parsons et al., 2013View full citation)
Absolute structure parameter 0.1 (3)
Computer programs: RAPID-AUTO (Rigaku, 2009View full citation), SHELXT2018/2 (Sheldrick, 2015aView full citation), SHELXL2018/3 (Sheldrick, 2015bView full citation) and OLEX2 (Dolomanov et al., 2009View full citation).

Structural data


Computing details top

(2S,3S,4S)-Hexane-1,2,3,4,6-pentol top
Crystal data top
C6H14O5Z = 2
Mr = 166.17F(000) = 180
Triclinic, P1Dx = 1.394 Mg m3
a = 5.5249 (3) ÅCu Kα radiation, λ = 1.54187 Å
b = 8.0330 (4) ÅCell parameters from 4704 reflections
c = 9.9771 (5) Åθ = 5.0–68.4°
α = 108.091 (3)°µ = 1.05 mm1
β = 107.597 (3)°T = 296 K
γ = 93.072 (3)°Block, clear light colourless
V = 395.86 (4) Å30.1 × 0.1 × 0.1 mm
Data collection top
Rigaku R-AXIS RAPID
diffractometer
2115 reflections with I > 2σ(I)
Detector resolution: 10.000 pixels mm-1Rint = 0.054
ω scansθmax = 68.2°, θmin = 5.0°
Absorption correction: multi-scan
(ABSCOR; Rigaku, 1995)
h = 66
Tmin = 0.666, Tmax = 1.000k = 99
7108 measured reflectionsl = 1211
2577 independent reflections
Refinement top
Refinement on F2Hydrogen site location: inferred from neighbouring sites
Least-squares matrix: fullH-atom parameters constrained
R[F2 > 2σ(F2)] = 0.040 w = 1/[σ2(Fo2) + (0.0458P)2]
where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.102(Δ/σ)max < 0.001
S = 1.11Δρmax = 0.20 e Å3
2577 reflectionsΔρmin = 0.26 e Å3
209 parametersAbsolute structure: Flack x determined using 741 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013)
3 restraintsAbsolute structure parameter: 0.1 (3)
Primary atom site location: iterative
Special details top

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Refinement. The structure was solved using SHELXT (Sheldrick, 2015a) and refined against F2 by full-matrix least-squares methods using SHELXL (Sheldrick, 2015b). All non-hydrogen atoms were refined anisotropically. Hydrogen atoms were placed in geometrically calculated positions and refined using constrained models. The final refinement gave R1 = 0.0398 for reflections with I > 2σ(I) and wR2 = 0.1021 for all data. The maximum and minimum residual electron densities were 0.20 and -0.26 e Å-3, respectively. The Flack parameter was 0.1 (3).

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
O10.9790 (6)0.2113 (4)0.7967 (3)0.0344 (7)
H10.9512800.1924630.8673990.052*
O20.6517 (6)0.4837 (3)0.6156 (3)0.0286 (7)
H20.7636980.5711240.6479640.043*
O30.3175 (6)0.5092 (3)0.8867 (3)0.0280 (7)
H30.2198410.4142830.8531980.042*
O40.6420 (5)0.8103 (3)0.9513 (3)0.0325 (7)
H40.6975870.9141770.9684130.049*
O50.0103 (5)0.7770 (3)0.6970 (3)0.0311 (7)
H50.0262310.8002310.6303350.047*
C10.7495 (9)0.1538 (6)0.6698 (5)0.0364 (12)
H1A0.6947420.0278490.6442920.044*
H1B0.7860370.1708630.5853920.044*
C20.5335 (8)0.2510 (5)0.6953 (5)0.0291 (10)
H2A0.4873330.2255100.7740490.035*
H2B0.3845110.2065980.6046360.035*
C30.5985 (8)0.4509 (5)0.7382 (4)0.0211 (8)
H3A0.7523210.4964500.8279070.025*
C40.3775 (8)0.5449 (5)0.7679 (4)0.0201 (8)
H4A0.2256000.4995820.6770630.024*
C50.4361 (8)0.7451 (5)0.8122 (4)0.0225 (9)
H5A0.4901260.7740130.7360310.027*
C60.2076 (8)0.8350 (5)0.8298 (4)0.0269 (10)
H6A0.1606620.8118150.9092530.032*
H6B0.2574990.9622980.8596040.032*
O60.1063 (5)0.1703 (4)0.0491 (3)0.0311 (7)
H60.1654600.2616600.0754850.047*
O70.3060 (5)0.5254 (3)0.3734 (3)0.0281 (7)
H70.4124280.5069200.4426080.042*
O80.6987 (5)0.4824 (3)0.1278 (3)0.0267 (7)
H80.5970430.5053910.0594780.040*
O90.4729 (5)0.8068 (4)0.2047 (3)0.0367 (7)
H90.5158380.7919880.1305310.055*
O101.1106 (6)0.8219 (4)0.4667 (3)0.0331 (7)
H101.1752250.7343510.4368670.050*
C70.0984 (9)0.1598 (6)0.1742 (5)0.0311 (10)
H7A0.1121950.0360350.1598140.037*
H7B0.0559070.2087400.2645850.037*
C80.3546 (8)0.2575 (5)0.1948 (5)0.0296 (10)
H8A0.3906550.2139630.1017560.035*
H8B0.4872860.2304720.2706350.035*
C90.3703 (8)0.4578 (5)0.2403 (4)0.0222 (9)
H9A0.2423770.4834960.1599390.027*
C100.6339 (8)0.5506 (5)0.2608 (4)0.0200 (8)
H10A0.7606030.5224650.3401510.024*
C110.6564 (8)0.7525 (5)0.3108 (4)0.0243 (9)
H110.6176820.7918010.4042360.029*
C120.9233 (8)0.8456 (5)0.3427 (4)0.0290 (10)
H12A0.9732440.8003760.2545670.035*
H12B0.9198260.9714210.3629140.035*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
O10.0300 (19)0.0320 (16)0.0498 (19)0.0081 (14)0.0169 (16)0.0217 (14)
O20.034 (2)0.0312 (16)0.0245 (15)0.0053 (14)0.0139 (14)0.0104 (12)
O30.0333 (19)0.0246 (15)0.0285 (16)0.0011 (13)0.0132 (15)0.0104 (12)
O40.0309 (17)0.0198 (13)0.0355 (15)0.0033 (12)0.0011 (13)0.0074 (12)
O50.0250 (19)0.0372 (17)0.0351 (17)0.0078 (14)0.0076 (14)0.0200 (14)
C10.046 (3)0.027 (2)0.035 (2)0.012 (2)0.015 (2)0.0080 (19)
C20.026 (3)0.019 (2)0.037 (2)0.0028 (18)0.008 (2)0.0059 (18)
C30.022 (2)0.022 (2)0.0177 (17)0.0036 (18)0.0045 (17)0.0077 (15)
C40.020 (2)0.0196 (19)0.0208 (19)0.0026 (17)0.0061 (18)0.0082 (15)
C50.025 (3)0.021 (2)0.0203 (19)0.0042 (17)0.0053 (18)0.0078 (16)
C60.030 (3)0.020 (2)0.029 (2)0.0103 (19)0.010 (2)0.0061 (17)
O60.0272 (19)0.0254 (15)0.0347 (15)0.0009 (13)0.0076 (14)0.0053 (11)
O70.0285 (18)0.0353 (17)0.0230 (14)0.0086 (14)0.0112 (13)0.0105 (13)
O80.031 (2)0.0275 (14)0.0233 (14)0.0093 (13)0.0121 (14)0.0070 (12)
O90.043 (2)0.0343 (15)0.0356 (15)0.0195 (14)0.0111 (14)0.0158 (13)
O100.031 (2)0.0313 (16)0.0318 (15)0.0024 (14)0.0086 (15)0.0058 (12)
C70.034 (3)0.029 (2)0.032 (2)0.003 (2)0.010 (2)0.0143 (19)
C80.023 (2)0.027 (2)0.034 (2)0.0012 (19)0.007 (2)0.0073 (19)
C90.022 (2)0.024 (2)0.0158 (18)0.0046 (17)0.0030 (17)0.0046 (15)
C100.019 (2)0.0233 (19)0.0165 (18)0.0027 (17)0.0049 (17)0.0061 (15)
C110.031 (3)0.022 (2)0.0191 (19)0.0061 (18)0.0061 (18)0.0074 (16)
C120.037 (3)0.021 (2)0.029 (2)0.002 (2)0.012 (2)0.0084 (18)
Geometric parameters (Å, º) top
O1—H10.8200O6—H60.8200
O1—C11.424 (5)O6—C71.438 (5)
O2—H20.8200O7—H70.8200
O2—C31.435 (4)O7—C91.429 (4)
O3—H30.8200O8—H80.8200
O3—C41.427 (4)O8—C101.430 (4)
O4—H40.8200O9—H90.8200
O4—C51.423 (5)O9—C111.423 (4)
O5—H50.8200O10—H100.8200
O5—C61.419 (4)O10—C121.425 (5)
C1—H1A0.9700C7—H7A0.9700
C1—H1B0.9700C7—H7B0.9700
C1—C21.502 (6)C7—C81.506 (6)
C2—H2A0.9700C8—H8A0.9700
C2—H2B0.9700C8—H8B0.9700
C2—C31.519 (5)C8—C91.520 (5)
C3—H3A0.9800C9—H9A0.9800
C3—C41.526 (4)C9—C101.526 (4)
C4—H4A0.9800C10—H10A0.9800
C4—C51.517 (5)C10—C111.528 (5)
C5—H5A0.9800C11—H110.9800
C5—C61.517 (5)C11—C121.511 (5)
C6—H6A0.9700C12—H12A0.9700
C6—H6B0.9700C12—H12B0.9700
C1—O1—H1109.5C7—O6—H6109.5
C3—O2—H2109.5C9—O7—H7109.5
C4—O3—H3109.5C10—O8—H8109.5
C5—O4—H4109.5C11—O9—H9109.5
C6—O5—H5109.5C12—O10—H10109.5
O1—C1—H1A109.0O6—C7—H7A109.0
O1—C1—H1B109.0O6—C7—H7B109.0
O1—C1—C2113.1 (4)O6—C7—C8113.0 (3)
H1A—C1—H1B107.8H7A—C7—H7B107.8
C2—C1—H1A109.0C8—C7—H7A109.0
C2—C1—H1B109.0C8—C7—H7B109.0
C1—C2—H2A108.8C7—C8—H8A108.7
C1—C2—H2B108.8C7—C8—H8B108.7
C1—C2—C3113.7 (4)C7—C8—C9114.2 (4)
H2A—C2—H2B107.7H8A—C8—H8B107.6
C3—C2—H2A108.8C9—C8—H8A108.7
C3—C2—H2B108.8C9—C8—H8B108.7
O2—C3—C2107.2 (3)O7—C9—C8110.2 (3)
O2—C3—H3A109.4O7—C9—H9A107.8
O2—C3—C4109.5 (3)O7—C9—C10110.8 (3)
C2—C3—H3A109.4C8—C9—H9A107.8
C2—C3—C4112.0 (3)C8—C9—C10112.2 (3)
C4—C3—H3A109.4C10—C9—H9A107.8
O3—C4—C3110.1 (3)O8—C10—C9110.8 (3)
O3—C4—H4A108.7O8—C10—H10A107.2
O3—C4—C5107.1 (3)O8—C10—C11111.0 (3)
C3—C4—H4A108.7C9—C10—H10A107.2
C5—C4—C3113.5 (3)C9—C10—C11113.1 (3)
C5—C4—H4A108.7C11—C10—H10A107.2
O4—C5—C4107.9 (3)O9—C11—C10111.5 (3)
O4—C5—H5A109.1O9—C11—H11107.3
O4—C5—C6108.7 (3)O9—C11—C12109.8 (3)
C4—C5—H5A109.1C10—C11—H11107.3
C6—C5—C4112.8 (3)C12—C11—C10113.3 (3)
C6—C5—H5A109.1C12—C11—H11107.3
O5—C6—C5113.2 (3)O10—C12—C11112.7 (3)
O5—C6—H6A108.9O10—C12—H12A109.0
O5—C6—H6B108.9O10—C12—H12B109.0
C5—C6—H6A108.9C11—C12—H12A109.0
C5—C6—H6B108.9C11—C12—H12B109.0
H6A—C6—H6B107.8H12A—C12—H12B107.8
O1—C1—C2—C357.9 (5)O6—C7—C8—C966.9 (5)
O2—C3—C4—O3178.3 (3)O7—C9—C10—O8179.8 (3)
O2—C3—C4—C561.7 (3)O7—C9—C10—C1154.9 (3)
O3—C4—C5—O457.6 (4)O8—C10—C11—O965.3 (4)
O3—C4—C5—C662.6 (4)O8—C10—C11—C1259.2 (4)
O4—C5—C6—O5179.2 (3)O9—C11—C12—O10169.6 (3)
C1—C2—C3—O261.7 (4)C7—C8—C9—O755.7 (4)
C1—C2—C3—C4178.2 (3)C7—C8—C9—C10179.6 (3)
C2—C3—C4—O359.5 (3)C8—C9—C10—O856.2 (4)
C2—C3—C4—C5179.6 (3)C8—C9—C10—C11178.4 (3)
C3—C4—C5—O464.2 (3)C9—C10—C11—O960.0 (3)
C3—C4—C5—C6175.7 (3)C9—C10—C11—C12175.6 (3)
C4—C5—C6—O559.5 (4)C10—C11—C12—O1065.0 (4)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
O1—H1···O6i0.821.992.809 (4)175
O2—H2···O5ii0.821.852.669 (4)172
O3—H3···O1iii0.821.872.683 (4)172
O4—H4···O6iv0.822.062.871 (4)168
O5—H5···O10iii0.821.882.697 (4)173
O6—H6···O8iii0.821.952.764 (4)176
O7—H7···O20.821.902.717 (4)174
O8—H8···O3v0.821.952.752 (4)168
O10—H10···O7ii0.821.872.685 (4)176
Symmetry codes: (i) x+1, y, z+1; (ii) x+1, y, z; (iii) x1, y, z; (iv) x+1, y+1, z+1; (v) x, y, z1.
 

Acknowledgements

The authors sincerely thank Professor Genta Sakane (Okayama University of Science) for valuable discussions and technical advice, and Kei Takeshita (FUSHIMI Pharmaceutical Co., Ltd.) for helpful advice. This work was supported by the JST Support for Pioneering Research Initiated by the Next Generation (SPRING) program, Japan.

References

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