Crystal structures of 5,5′-bis(­hydroxy­methyl)-3,3′-biisoxazole and 4,4′,5,5′-tetrakis­(hydroxy­methyl)-3,3′-biisoxazole

Sausa, R.C.; Wingard, L.A.; Guzmán, P.E.; Pesce-Rodriguez, R.A.; Sabatini, J.J.; Zavalij, P.Y.

doi:10.1107/S2056989018000828

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ISSN: 2056-9890

Volume 74| Part 2| February 2018| Pages 196-200

https://doi.org/10.1107/S2056989018000828

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Crystal structures of 5,5′-bis(hydroxymethyl)-3,3′-biisoxazole and 4,4′,5,5′-tetrakis(hydroxymethyl)-3,3′-biisoxazole

Rosario C. Sausa,^a ^* Leah A. Wingard,^b Pablo E. Guzmán,^b Rose A. Pesce-Rodriguez,^a Jesse J. Sabatini ^b and Peter Y. Zavalij ^c

^aUS Army Research Laboratory, RDRL-WML-B, Aberdeen Proving Ground, MD 21005, USA, ^bUS Army Research Laboratory, RDRL-WML-C, Aberdeen Proving Ground, MD 21005, USA, and ^cUniversity of Maryland, College Park, MD 20742, USA
^*Correspondence e-mail: rosario.c.sausa.civ@mail.mil

Edited by C. Massera, Università di Parma, Italy (Received 19 December 2017; accepted 12 January 2018; online 19 January 2018)

The molecular structure of 5,5′-bis(hydroxymethyl)-3,3′-biisoxazole, C₈H₈N₂O₄ (1), is composed of two trans planar isoxazole rings [r.m.s deviation = 0.006 (1) Å], each connected with a methyl hydroxyl group. Similarly, the structure of 4,4′,5,5′-tetrakis(hydroxymethyl)-3,3′-biisoxazole, C₁₀H₁₂N₂O₆ (2), is composed of two planar isoxazole rings [r.m.s. deviation = 0.002 (1) Å], but with four hydroxymethyl groups as substituents. Both molecules sit on a center of inversion, thus Z′ = 0.5. The crystal structures are stabilized by networks of O—H⋯N [for (1)] and O—H⋯O hydrogen-bonding interactions [for (2)], giving rise to corrugated supramolecular planes. The isoxazole rings are packed in a slip-stacked fashion, with centroid-to-centroid distances of 4.0652 (1) Å for (1) (along the b-axis direction) and of 4.5379 (Å) for (2) (along the a-axis direction).

Keywords: crystal structure; hydroxymethyl-biisoxazole; FTIR.

CCDC references: 1816712; 1816711

1. Chemical context

The five-membered, heterocyclic isoxazole moiety forms the basis for a number of medical and agricultural products, as well as energetic materials (Galenko et al., 2015 ; Sausa et al., 2017 ; Wingard et al., 2017a ,b ; Sysak & Obmińska-Mrukowicz, 2017 ). Its versatility stems from the electronegative oxygen and nitrogen atoms, which provide the ring nucleophilic activity, and its three carbon atoms, which afford the addition of a variety of functional groups. The title compounds 5,5′-bis(hydroxymethyl)-3,3′-biisoxazole (1) and 4,4′,5,5′-tetrakis(hydroxymethyl)-3,3′-biisoxazole (2) exhibit two isoxazole rings, each attached with one or two hydroxymethy groups. These compounds have been synthesized recently in our laboratory as useful precursors to a new class of energetic materials. The addition of nitric acid to the title compounds results in nitrate esterification, yielding the energetic materials biisoxazolebis(methylene dinitrate) (3) and biisoxazoletetrakis(methyl nitrate) (4), where a nitrate functional group replaces the hydrogen atom in the hydroxyl groups (Wingard et al., 2017a,b). These derivative compounds are potential energetic plasticizing ingredients in nitrocellulose or melt-castable formulations because the rings present Lewis-base behavior towards electrophilic nitrocellulose and the alkyl nitric esters afford miscibility and compatibility with conventional energetic plasticizers.

2. Structural commentary

The title compounds exhibit molecular structures typical of biisoxazole derivatives. Fig. 1 reveals that the isoxazole rings of (1) exhibit a trans planar configuration [r.m.s deviation = 0.0009 (1) Å], suggesting a delocalized aromatic π system. The C4 atom is nearly coplanar with the ring (atom-to-mean plane distance = 0.006 Å), whereas the C4—O2 bond is twisted slightly out of the plane, as evidenced by the torsion angles C2—C1—C4—O2 = −13.3 (2)° and O1—C1—C4—O2 = 167.55 (11)°. Atoms C1/C4/O2 form a plane that subtends a dihedral angle of 12.72 (1)° with respect to the isoxazole ring. Similarly, the isoxazole rings of (2) are nearly planar [r.m.s deviation = 0.002 (1) Å]; however, the corresponding O2—C4 bond is twisted more out of plane than that of compound (1), as evidenced by the magnitude of the torsion angle O2—C4—C1—O1 = −54.93 (11)°. For comparison, the torsion angle formed by atoms O3—C5—C2—C1 is −110.02 (11)°. The atoms O2/C4/C1 and O3/C5/C2 form planes subtending dihedral angles of 53.78 (8) and 69.37 (7)° with respect to the isoxazole ring. Superimposition of the ring atoms of both structures (see Fig. 2) yields an r.m.s. deviation of 0.01 Å. Finally, compound (2) exhibits a weak intramolecular interaction involving atoms O3—H3A and N1ⁱⁱⁱ [see Table 2 for the geometrical parameters; symmetry code: (iii) = −x + 2, −y + 1, −z + 1.]

Table 2
Hydrogen-bond geometry (Å, °) for (II)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H2A⋯O3ⁱ	0.849 (18)	1.849 (18)	2.6936 (11)	172.8 (16)
O3—H3A⋯O2ⁱⁱ	0.792 (19)	2.085 (19)	2.7898 (11)	148.3 (18)
O3—H3A⋯N1ⁱⁱⁱ	0.792 (19)	2.550 (19)	3.0728 (12)	125.0 (16)
Symmetry codes: (i) $[-x+1, y+{\script{1\over 2}}, -z+{\script{1\over 2}}]$ ; (ii) $[x+1, -y+{\script{1\over 2}}, z+{\script{1\over 2}}]$ ; (iii) -x+2, -y+1, -z+1.

Figure 1
Molecular conformation and atom-numbering scheme of compounds (1) and (2). Non-labeled atoms of both structures are generated by inversion (−x + 2, −y + 1, −z + 1). Non-hydrogen atoms are shown as 50% probability displacement ellipsoids.

Figure 2
An overlay of the asymmetric units of compounds (1) and (2), depicted in red and green, respectively.

3. Supramolecular features

Intermolecular hydrogen bonding plays a key role in the stabilization of the crystal structures of the title compounds. Figs. 3 and 4 show the packing of (1) and (2), respectively, and Tables 1 and 2 list their hydrogen-bonding geometries. Compound (1) displays hydrogen bonding between the oxygen atoms O2, belonging to the hydroxy groups, and the N1 atoms of the isoxazole rings of adjacent molecules, generating a supramolecular framework parallel to ( $[\overline{2}]$ 01) [O2⋯N1ⁱ = 2.8461 (15) Å; symmetry code: (i) x − $[1\over2]$ , −y + $[1\over2]$ , z − $[1\over2]$ ]. In contrast, compound (2) forms a network of hydrogen bonds involving the hydroxy groups O2—H2A and O3—H3A of adjacent molecules, so that each OH group acts both as donor and acceptor [see Table 2 and Fig. 4; O2⋯O3ⁱ = 2.694 (1) Å; symmetry code: (i) −x + 1, y + $[{1\over 2}]$ , −z + $[{1\over 2}]$ ; O3⋯O2ⁱⁱ = 2.790 (1) Å; symmetry code: (ii) x + 1, −y + $[{1\over 2}]$ , z + $[{1\over 2}]$ ]. In this way, each molecule forms eight hydrogen bonds with the four closest surrounding analogues, giving rise to corrugated planes parallel to ( $[\overline{1}]$ 02).

Table 1
Hydrogen-bond geometry (Å, °) for (I)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H2A⋯N1ⁱ	0.82	2.03	2.8461 (15)	171
Symmetry code: (i) $[x-{\script{1\over 2}}, -y+{\script{1\over 2}}, z-{\script{1\over 2}}]$ .

Figure 3
Crystal packing of (1) viewed along the a-axis direction. Dashed lines represent O2—H2A⋯N1ⁱ hydrogen bonds; symmetry code: (i) x − $[1\over2]$ , −y + $[1\over2]$ , z − $[1\over2]$ .

Figure 4
Crystal packing of (2) viewed along the a-axis direction. Dashed lines represent O2—H2A⋯O3ⁱ and O3—H3A⋯O2ⁱⁱ hydrogen bonds; symmetry codes: (i) −x + 1, y + $[{1\over 2}]$ , −z + $[{1\over 2}]$ ; (ii) x + 1, −y + $[{1\over 2}]$ , z + $[{1\over 2}]$ .

The crystal structure of (1) reveals a slip-stacked geometry of the rings in the b-axis direction, with centroid-to-centroid distances of 4.0652 (1) Å and plane-to-plane shifts of 2.256 (2) Å. In contrast, in compound (2) the rings are stacked along the a-axis direction, with centroid-to-centroid distances of 4.5379 (4) Å and plane-to-plane shifts of 2.683 (2) Å.

4. Database survey

A search of the Cambridge Structural Database (CSD web interface, December 2017; Groom et al., 2016 ) and the Crystallography Open Database (Gražulis et al., 2009 ) yielded the crystal structures of several compounds containing the biisoxazole moiety. For examples, see Cannas & Marongiu (1967 ) (CCDC 1111317, BIOXZL); van der Peet et al. (2013 ) (CCDC 935274, LIRLEF); Sausa et al. (2017) (CCDC 1540757, TAXDUU); Wingard et al. (2017b) (CCDC 1529260, WANVEP). Compounds (3) (Sausa et al., 2017) and (4) (Wingard et al. 2017b) are noteworthy because they are nitrate derivatives of the title compounds (1) and (2), respectively, with the hydrogen atoms in the OH groups replaced by NO₂ moieties. A superimposition of the respective isoxazole rings of compound (1) and (3) yields an r.m.s. deviation of 0.004 Å (Fig. 5A). In both molecules, the rings adopt a trans conformations; however, in (1) the O1 and O2 atoms are in a trans conformation with respect to the C1—C4 bond, whereas in (3) the corresponding O atoms are in a cis conformation. In (1), the plane encompassing the atoms O2, C4, and C1 forms a dihedral angle of 12.72 (1)° with respect to the mean plane of the isoxazole ring, in contrast to a value of 66.8 (2)° in (3) for the corresponding atoms. A similar comparison between (2) and (4) yields an r.m.s. deviation of 0.01 Å for the superimposition of the isoxazole rings, and dihedral angles of 53.78 (8) and 69.37 (7)° for (2) (planes formed by the atoms O2/C4/C1 and O3/C5/C2, respectively) compared to those of 84.54 (14) and 84.81 (18)° or 79.19 (15) and 82.32 (17)° for (4) (Fig. 5B). The most striking supramolecular difference between the title compounds and (3) and (4) is that the former exhibit hydrogen bonding, which contributes to the stability of their crystal structure.

Figure 5
Overlays of the asymmetric units of (1) and (3) (A) and (2) and (4) (B).

5. Synthesis and crystallization

The synthesis of the title compounds has been reported recently (Wingard et al., 2017a,b). Briefly, they were prepared by [3 + 2] cycloaddition of dichloroglyoxime and alcohol. In the case of compound (1), a saturated solution of sodium bicarbonate was added to a solution of dichloroglyoxime (30 g), propargyl alcohol (55.2 ml), and methanol (1900 ml) over 6 h. Once the reaction was complete, the product was stirred for an additional 10 h and the remaining solvent evaporated. A yield of 75% was obtained after the product was washed with distilled water, collected by Büchner filtration, and then dried. Compound (2) was prepared by adding dropwise a dichloroglyoxime and butyl alcohol solution (0.8 M) to a refluxing solution comprising NaHCO₃ (6.7 g), 2-butyne-1,4-diol (13.72 g), and butyl alcohol (200 ml). Once the reaction was complete, the product was cooled to room temperature and the remaining solvent evaporated. Then, the product was washed with distilled water, filtered, and dried, resulting in a yield of 68%. Slow solvent evaporation of the title compounds in methanol yielded suitable single crystals for the X-ray diffraction experiments at 150K. We note the title compounds have nearly the same density (1.596 vs 1.597 Mg m⁻³), given that their molecular mass and cell constants are quite different.

Fig. 6 shows the FTIR spectra of (1) and (2) recorded with a Nicolet iS50 spectrophotometer, using attenuated total reflectance. The intense peak frequencies (cm⁻¹) are listed as follows: Compound (1): 3371.83, 3126.65, 1596.96, 1415.14, 1360.62, 1268.13, 1237.16, 1080.70, 1058.61, 1026.40, 993.24, 929.53, 901.95, 828.87, 746.83, 653.69, 621.96, and 424.11. Compound (2): 3234.89, 1623.59, 1456.55, 1418.41, 1354.66, 1261.30, 1185.44, 1128.41, 1046.52, 1011.82, 984.07, 964.14, 931.24, 906.80, 764.50, 725.86, 641.00, 576.90, 475.85, and 449.97.

Figure 6
FTIR spectra of the title compounds.

6. Refinement

Crystal data, data collection, structure solution and refinement details are summarized in Table 3. The hydrogen atoms for compound (1) were refined using a riding model with C—H = 0.93 or 0.98 Å and U_iso(H) = 1.2U_eq(C) and O—H = 0.74–0.85 Å and U_iso(H) = 1.5U_eq(O), whereas for compound (2) all the hydrogen atoms were refined independently including isotropic displacement parameters.

Table 3
Experimental details

	(I)	(II)
Crystal data
Chemical formula	C₈H₈N₂O₄	C₁₀H₁₂N₂O₆
M_r	196.16	256.22
Crystal system, space group	Monoclinic, P2₁/n	Monoclinic, P2₁/c
Temperature (K)	150	150
a, b, c (Å)	7.7824 (3), 4.0652 (1), 13.2109 (5)	4.5379 (4), 9.9195 (8), 12.0177 (9)
β (°)	102.334 (4)	99.9312 (11)
V (Å³)	408.31 (2)	532.86 (8)
Z	2	2
Radiation type	Mo Kα	Mo Kα
μ (mm⁻¹)	0.13	0.13
Crystal size (mm)	0.35 × 0.25 × 0.05	0.49 × 0.20 × 0.11

Data collection
Diffractometer	Rigaku Oxford DiffractionSuperNova, Dualflex, EosS2	Bruker SMART APEXII CCD
Absorption correction	Multi-scan (CrysAlis PRO; Rigaku OD, 2015 $[Rigaku OD (2015). CrysAlis PRO. Rigaku Oxford Diffraction Ltd, Yarnton, England.]$ ; Bourhis et al., 2015 )	Multi-scan (SADABS; Sheldrick, 2008 )
T_min, T_max	0.207, 1.000	0.904, 0.985
No. of measured, independent and observed [I > 2σ(I)] reflections	3474, 823, 754	7638, 1737, 1570
R_int	0.027	0.019
(sin θ/λ)_max (Å⁻¹)	0.624	0.730

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.033, 0.086, 1.04	0.034, 0.072, 1.00
No. of reflections	823	1737
No. of parameters	66	106
H-atom treatment	H-atom parameters constrained	All H-atom parameters refined
Δρ_max, Δρ_min (e Å⁻³)	0.28, −0.15	0.44, −0.22
Computer programs: CrysAlis PRO (Rigaku OD, 2015 $[Rigaku OD (2015). CrysAlis PRO. Rigaku Oxford Diffraction Ltd, Yarnton, England.]$ ), APEX2, XSHELL and SAINT (Bruker, 2010 ), SHELXT (Sheldrick, 2015a ), SHELXS97 (Sheldrick, 2008), SHELXL2014 (Sheldrick, 2015b ), OLEX2 (Dolomanov et al., 2009 ), Mercury (Macrae et al., 2008 ) and PLATON (Spek, 2009 ).

Supporting information

CCDC references: 1816712; 1816711

Crystal structure: contains datablocks 1, 2. DOI: https://doi.org/10.1107/S2056989018000828/xi2007sup1.cif

Structure factors: contains datablocks 1, 2. DOI: https://doi.org/10.1107/S2056989018000828/xi20071sup3.hkl

Structure factors: contains datablock 2. DOI: https://doi.org/10.1107/S2056989018000828/xi20072sup2.hkl

Supporting information file. DOI: https://doi.org/10.1107/S2056989018000828/xi20071sup4.cml

Supporting information file. DOI: https://doi.org/10.1107/S2056989018000828/xi20072sup5.cml

checkCIF report

Computing details top

Data collection: CrysAlis PRO (Rigaku OD, 2015) for (1); APEX2 (Bruker, 2010) for (2). Cell refinement: CrysAlis PRO (Rigaku OD, 2015) for (1); SAINT (Bruker, 2010) for (2). Data reduction: CrysAlis PRO (Rigaku OD, 2015) for (1); SAINT (Bruker, 2010) for (2). Program(s) used to solve structure: SHELXT (Sheldrick, 2015a) for (1); SHELXS97 (Sheldrick, 2008) for (2). Program(s) used to refine structure: SHELXL (Sheldrick, 2015b) for (1); SHELXL2014 (Sheldrick, 2015b) for (2). Molecular graphics: OLEX2 (Dolomanov et al., 2009) for (1); XSHELL (Bruker, 2010) for (2). Software used to prepare material for publication: Mercury (Macrae et al., 2008) for (1); PLATON (Spek, 2009) for (2).

5,5'-Dihydroxymethyl-3,3'-biisoxazole (1) top

Crystal data top

C₈H₈N₂O₄	F(000) = 204
M_r = 196.16	D_x = 1.596 Mg m⁻³
Monoclinic, P2₁/n	Mo Kα radiation, λ = 0.71073 Å
a = 7.7824 (3) Å	Cell parameters from 1980 reflections
b = 4.0652 (1) Å	θ = 2.8–26.2°
c = 13.2109 (5) Å	µ = 0.13 mm⁻¹
β = 102.334 (4)°	T = 150 K
V = 408.31 (2) Å³	Block, colorless
Z = 2	0.35 × 0.25 × 0.05 mm

Data collection top

Rigaku Oxford DiffractionSuperNova, Dualflex, EosS2 diffractometer	823 independent reflections
Radiation source: fine-focus sealed X-ray tube, Enhance (Mo) X-ray Source	754 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.027
Detector resolution: 8.0945 pixels mm^-1	θ_max = 26.3°, θ_min = 2.8°
ω scans	h = −9→9
Absorption correction: multi-scan CrysAlisPro (Rigaku OD, 2015; Bourhis et al., 2015)	k = −5→5
T_min = 0.207, T_max = 1.000	l = −16→16
3474 measured reflections

Refinement top

Refinement on F²	Hydrogen site location: inferred from neighbouring sites
Least-squares matrix: full	H-atom parameters constrained
R[F² > 2σ(F²)] = 0.033	w = 1/[σ²(F_o²) + (0.040P)² + 0.183P] where P = (F_o² + 2F_c²)/3
wR(F²) = 0.086	(Δ/σ)_max < 0.001
S = 1.03	Δρ_max = 0.28 e Å⁻³
823 reflections	Δρ_min = −0.15 e Å⁻³
66 parameters	Extinction correction: SHELXL-2016/4 (Sheldrick 2015), Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
0 restraints	Extinction coefficient: 0.041 (8)
Primary atom site location: dual

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
C1	0.64217 (17)	0.3456 (3)	0.39844 (9)	0.0193 (3)
C2	0.78918 (17)	0.5023 (3)	0.38810 (10)	0.0207 (3)
H2	0.808128	0.621413	0.331370	0.025*
C3	0.90869 (16)	0.4449 (3)	0.48325 (9)	0.0188 (3)
C4	0.46651 (17)	0.3002 (3)	0.32830 (10)	0.0230 (3)
H4A	0.453788	0.076229	0.302446	0.028*
H4B	0.373826	0.343734	0.365286	0.028*
N1	0.83872 (14)	0.2665 (3)	0.54646 (8)	0.0238 (3)
O1	0.66636 (12)	0.2010 (2)	0.49285 (7)	0.0240 (3)
O2	0.45577 (14)	0.5241 (3)	0.24526 (7)	0.0304 (3)
H2A	0.412548	0.431590	0.190584	0.046*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.0199 (7)	0.0198 (7)	0.0165 (6)	0.0029 (5)	0.0004 (5)	−0.0032 (5)
C2	0.0194 (7)	0.0238 (7)	0.0174 (6)	0.0007 (5)	0.0009 (5)	−0.0005 (5)
C3	0.0173 (7)	0.0209 (7)	0.0174 (6)	0.0021 (5)	0.0019 (5)	−0.0029 (5)
C4	0.0190 (7)	0.0249 (7)	0.0226 (7)	−0.0005 (5)	−0.0009 (5)	−0.0054 (5)
N1	0.0173 (6)	0.0315 (7)	0.0198 (6)	−0.0029 (5)	−0.0019 (4)	−0.0002 (5)
O1	0.0180 (5)	0.0319 (6)	0.0199 (5)	−0.0052 (4)	−0.0008 (4)	0.0003 (4)
O2	0.0342 (6)	0.0275 (6)	0.0230 (5)	−0.0011 (4)	−0.0087 (4)	−0.0024 (4)

Geometric parameters (Å, º) top

C1—C2	1.3419 (19)	C3—N1	1.3093 (17)
C1—C4	1.4901 (17)	C4—H4A	0.9700
C1—O1	1.3550 (15)	C4—H4B	0.9700
C2—H2	0.9300	C4—O2	1.4142 (17)
C2—C3	1.4143 (18)	N1—O1	1.4021 (14)
C3—C3ⁱ	1.465 (2)	O2—H2A	0.8200

C2—C1—C4	133.19 (12)	C1—C4—H4A	110.3
C2—C1—O1	110.24 (11)	C1—C4—H4B	110.3
O1—C1—C4	116.57 (11)	H4A—C4—H4B	108.5
C1—C2—H2	127.9	O2—C4—C1	107.28 (11)
C1—C2—C3	104.14 (11)	O2—C4—H4A	110.3
C3—C2—H2	127.9	O2—C4—H4B	110.3
C2—C3—C3ⁱ	129.00 (15)	C3—N1—O1	105.45 (10)
N1—C3—C2	111.97 (11)	C1—O1—N1	108.21 (10)
N1—C3—C3ⁱ	119.03 (14)	C4—O2—H2A	109.5

C1—C2—C3—C3ⁱ	179.69 (17)	C3—N1—O1—C1	0.23 (14)
C1—C2—C3—N1	−0.03 (15)	C4—C1—C2—C3	−179.05 (14)
C2—C1—C4—O2	−13.3 (2)	C4—C1—O1—N1	179.11 (11)
C2—C1—O1—N1	−0.26 (14)	O1—C1—C2—C3	0.18 (14)
C2—C3—N1—O1	−0.12 (15)	O1—C1—C4—O2	167.55 (11)
C3ⁱ—C3—N1—O1	−179.87 (14)

Symmetry code: (i) −x+2, −y+1, −z+1.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O2—H2A···N1ⁱⁱ	0.82	2.03	2.8461 (15)	171

Symmetry code: (ii) x−1/2, −y+1/2, z−1/2.

4,4',5,5'-Tetrahydroxymethyl-3,3'-biisoxazole (2) top

Crystal data top

C₁₀H₁₂N₂O₆	F(000) = 268
M_r = 256.22	D_x = 1.597 Mg m⁻³
Monoclinic, P2₁/c	Mo Kα radiation, λ = 0.71073 Å
a = 4.5379 (4) Å	Cell parameters from 3988 reflections
b = 9.9195 (8) Å	θ = 2.7–32.1°
c = 12.0177 (9) Å	µ = 0.13 mm⁻¹
β = 99.9312 (11)°	T = 150 K
V = 532.86 (8) Å³	Needle, colourless
Z = 2	0.49 × 0.20 × 0.11 mm

Data collection top

Bruker SMART APEXII CCD diffractometer	1737 independent reflections
Radiation source: sealed tube	1570 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.019
Detector resolution: 8.333 pixels mm^-1	θ_max = 31.3°, θ_min = 2.7°
φ and ω scans	h = −6→6
Absorption correction: multi-scan (SADABS; Sheldrick, 2008)	k = −14→14
T_min = 0.904, T_max = 0.985	l = −17→17
7638 measured reflections

Refinement top

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)] = 0.034	Hydrogen site location: difference Fourier map
wR(F²) = 0.072	All H-atom parameters refined
S = 1.00	w = 1/[σ²(F_o²) + (0.010P)² + 0.3955P] where P = (F_o² + 2F_c²)/3
1737 reflections	(Δ/σ)_max < 0.001
106 parameters	Δρ_max = 0.44 e Å⁻³
0 restraints	Δρ_min = −0.22 e Å⁻³

Special details top

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
O1	0.58044 (17)	0.58291 (7)	0.30718 (6)	0.01981 (16)
O2	0.23448 (16)	0.42300 (8)	0.13078 (6)	0.01890 (15)
H2A	0.174 (4)	0.5035 (18)	0.1182 (14)	0.039 (4)*
O3	0.93528 (19)	0.17777 (8)	0.42532 (7)	0.02252 (17)
H3A	1.037 (4)	0.1801 (18)	0.4858 (16)	0.045 (5)*
N1	0.7277 (2)	0.60707 (9)	0.41811 (7)	0.02010 (18)
C1	0.6765 (2)	0.46292 (10)	0.27170 (8)	0.01576 (17)
C2	0.8810 (2)	0.40630 (9)	0.35428 (8)	0.01513 (17)
C3	0.9048 (2)	0.50244 (10)	0.44419 (8)	0.01585 (18)
C4	0.5528 (2)	0.42337 (10)	0.15275 (8)	0.01753 (18)
H4A	0.631 (3)	0.4856 (14)	0.1016 (12)	0.022 (3)*
H4B	0.622 (3)	0.3337 (14)	0.1391 (11)	0.021 (3)*
C5	1.0376 (2)	0.27405 (10)	0.35134 (9)	0.01875 (19)
H5A	1.255 (3)	0.2866 (14)	0.3717 (12)	0.024 (3)*
H5B	0.992 (3)	0.2362 (14)	0.2760 (11)	0.021 (3)*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
O1	0.0240 (4)	0.0166 (3)	0.0163 (3)	0.0036 (3)	−0.0036 (3)	−0.0010 (3)
O2	0.0163 (3)	0.0169 (3)	0.0216 (3)	−0.0003 (3)	−0.0019 (3)	−0.0014 (3)
O3	0.0302 (4)	0.0154 (3)	0.0187 (4)	−0.0019 (3)	−0.0050 (3)	0.0026 (3)
N1	0.0253 (4)	0.0171 (4)	0.0153 (4)	0.0022 (3)	−0.0038 (3)	−0.0019 (3)
C1	0.0171 (4)	0.0143 (4)	0.0154 (4)	−0.0012 (3)	0.0015 (3)	−0.0003 (3)
C2	0.0167 (4)	0.0136 (4)	0.0148 (4)	−0.0008 (3)	0.0017 (3)	0.0001 (3)
C3	0.0183 (4)	0.0139 (4)	0.0145 (4)	−0.0012 (3)	0.0003 (3)	0.0001 (3)
C4	0.0171 (4)	0.0199 (4)	0.0147 (4)	−0.0007 (3)	0.0001 (3)	−0.0006 (3)
C5	0.0219 (4)	0.0161 (4)	0.0176 (4)	0.0030 (3)	0.0015 (3)	−0.0006 (3)

Geometric parameters (Å, º) top

O1—N1	1.4050 (11)	C3—C2	1.4312 (13)
O2—H2A	0.849 (18)	C3—C3ⁱ	1.4657 (18)
O2—C4	1.4229 (12)	C4—C1	1.4952 (13)
O3—H3A	0.792 (19)	C4—H4A	0.980 (14)
N1—C3	1.3171 (12)	C4—H4B	0.966 (14)
C1—O1	1.3612 (12)	C5—O3	1.4354 (13)
C1—C2	1.3577 (13)	C5—H5A	0.982 (14)
C2—C5	1.4953 (13)	C5—H5B	0.969 (14)

C1—O1—N1	108.71 (7)	O2—C4—C1	112.33 (8)
C4—O2—H2A	108.4 (11)	O2—C4—H4A	110.6 (8)
C5—O3—H3A	110.4 (13)	O2—C4—H4B	108.3 (8)
C3—N1—O1	105.20 (8)	C1—C4—H4A	108.5 (8)
O1—C1—C4	116.17 (8)	C1—C4—H4B	108.9 (8)
C2—C1—O1	110.38 (8)	H4A—C4—H4B	108.1 (11)
C2—C1—C4	133.38 (9)	O3—C5—C2	111.30 (8)
C1—C2—C3	103.26 (8)	O3—C5—H5A	110.3 (8)
C1—C2—C5	127.83 (9)	O3—C5—H5B	106.3 (8)
C3—C2—C5	128.91 (9)	C2—C5—H5A	110.1 (8)
N1—C3—C2	112.45 (8)	C2—C5—H5B	109.7 (8)
N1—C3—C3ⁱ	118.88 (11)	H5A—C5—H5B	109.0 (11)
C2—C3—C3ⁱ	128.67 (11)

O1—N1—C3—C2	−0.53 (11)	C1—C2—C5—O3	−110.02 (11)
O1—N1—C3—C3ⁱ	179.26 (10)	C2—C1—O1—N1	0.05 (11)
O1—C1—C2—C3	−0.35 (10)	C3—C2—C5—O3	68.82 (13)
O1—C1—C2—C5	178.72 (9)	C3ⁱ—C3—C2—C1	−179.21 (12)
O2—C4—C1—O1	−54.93 (11)	C3ⁱ—C3—C2—C5	1.74 (19)
O2—C4—C1—C2	128.39 (11)	C4—C1—O1—N1	−177.38 (8)
N1—C3—C2—C1	0.56 (11)	C4—C1—C2—C3	176.48 (10)
N1—C3—C2—C5	−178.49 (10)	C4—C1—C2—C5	−4.46 (18)
C1—O1—N1—C3	0.30 (10)

Symmetry code: (i) −x+2, −y+1, −z+1.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O2—H2A···O3ⁱⁱ	0.849 (18)	1.849 (18)	2.6936 (11)	172.8 (16)
O3—H3A···O2ⁱⁱⁱ	0.792 (19)	2.085 (19)	2.7898 (11)	148.3 (18)
O3—H3A···N1ⁱ	0.792 (19)	2.550 (19)	3.0728 (12)	125.0 (16)

Symmetry codes: (i) −x+2, −y+1, −z+1; (ii) −x+1, y+1/2, −z+1/2; (iii) x+1, −y+1/2, z+1/2.

Acknowledgements

We thank Dr D. Taylor of the US Army Research Laboratory and Dr Eric Reinheimer of Rigaku for helpful suggestions regarding this work.

References

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Volume 74| Part 2| February 2018| Pages 196-200

https://doi.org/10.1107/S2056989018000828

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research communications\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

Crystal structures of 5,5′-bis­(­hy­droxy­methyl)-3,3′-biisoxazole and 4,4′,5,5′-tetra­kis­­(hy­droxy­methyl)-3,3′-biisoxazole

1. Chemical context

2. Structural commentary

3. Supra­molecular features

4. Database survey

5. Synthesis and crystallization

6. Refinement

Supporting information

Acknowledgements

References

research communications

Crystal structures of 5,5′-bis(hydroxymethyl)-3,3′-biisoxazole and 4,4′,5,5′-tetrakis(hydroxymethyl)-3,3′-biisoxazole

3. Supramolecular features