supplementary materials


zq2209 scheme

Acta Cryst. (2013). E69, o1728    [ doi:10.1107/S160053681302761X ]

4-Eth­oxy-3-meth­oxy­benzaldehyde

Z. Leka, S. B. Novakovic, G. A. Bogdanovic, J. Muskinja and R. D. Vukicevic

Abstract top

In the title compound, C10H12O3, all non-H atoms are approximately coplanar, with an r.m.s. deviation of 0.046 Å. In the crystal, very weak C-H...O inter­actions link the mol­ecules into sheets parallel to (101).

Comment top

Dehydrozingerone derivatives belong to an important class of compounds, not only due to their different bioactivities (Tatsuzaki et al., 2006; Kubra et al., 2013), but also as the key substrates in synthesis of some heterocycles (Panda et al., 2008), particularly flavones (Mostahar et al., 2007). They can be synthesized by condensation of the corresponding aromatic aldehyde with acetone. Thus, starting substrate in synthesis of ethyl derivative of dehydrozingerone is 4-ethoxy-3-methoxybenzaldehyde (I), compound obtained by simple methylation of vanillin.

In the title structure, all non-hydrogen atoms are approximately coplanar with a mean deviation of 0.046 Å (Fig. 1). A somewhat higher displacement of 0.102 (2) Å has been observed for atom C9 belonging to ethoxy moiety. The dihedral angle between the best planes through the phenyl ring and the non-H atoms of ethoxy moiety is 8.1 (1)°. The aromatic C—C bond lengths are in the expected range of 1.368 (2)–1.411 (2) Å (Table 2). The five C—O bonds have various lengths. The shortest length is found for the carbonyl C1—O1 = 1.204 (2) bond in accordance with the prevaling double bond character.

The crystal structure exhibits no conventional hydrogen bonding. The molecules are held together by weak C–H···O and van der Waals interactions. The two C—H···O intermolecular contacts shorter than the sum of the van der Waals radii [C1—H1 = 0.93; H1···O1= 2.67 Å; C1—H1···O1i = 157.3° and C10—H10B = 0.96, H10B···O2 = 2.62 Å, C10—H10B···O2ii = 156.4° (symmetry codes: i = -x,+y - 1/2,-z + 3/2; ii = -x + 1,+y - 1/2,-z + 1/2)] connect the molecules into a sheet parallel to (101). These sheets further connect into three-dimensional structure by C—H···π interaction [C10—H10c = 0.96, H10c···Cg1 = 3.00 Å C10—H10c···Cg1iii = 147° [(symmetry code: iii = -x + 1,-y,-z + 1)] (Fig. 2). The approximate distance between the adjacent parallel sheets is 3.5 Å. For related crystal structures, see Matos Beja et al. (1997) and Velavan et al. (1995).

Related literature top

For the bioactivity of dehydrozingerone derivatives and their role in the synthesis of heterocycles, see: Tatsuzaki et al. (2006); Kubra et al. (2013); Panda et al. (2008); Mostahar et al. (2007). For related crystal structures, see: Matos Beja et al. (1997); Velavan et al. (1995).

Experimental top

Diethyl sulfate was dropped into a water solution of sodium hydroxide and vanillin. The reaction mixture was stirred overnight at 50°C and cooled at room temperature resulting firstly an oily product, which on standing gave crude crystal 4-ethoxy-3-methoxybenzaldehyde.

One gram of crude 4-ethoxy-3-methoxybenzaldehyde was stirred vigorously in 150 ml of boiling water, the hot mixture filtered of through a cotton pad. The obtained milky-white emulsion upon overnight cooling at room temperature gave crystal needles of 4-ethoxy-3-methoxybenzaldehyde.

Refinement top

All H atoms were included in calculated positions and treated as riding with d(C—H) equal to: 0.96 Å (CH3), 0.97 Å (CH2) or 0.93 Å (aromatic CH) and Uiso(H) equal to: 1.5 Ueq(C) for CH3 or 1.2 Ueq(C) for CH2 and CH.

Computing details top

Data collection: CrysAlis PRO (Agilent, 2013); cell refinement: CrysAlis PRO (Agilent, 2013); data reduction: CrysAlis PRO (Agilent, 2013); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and Mercury (Macrae et al., 2006); software used to prepare material for publication: WinGX (Farrugia, 2012), PLATON (Spek, 2009) and PARST (Nardelli, 1995).

Figures top
[Figure 1] Fig. 1. The molecular structure of the title compound, with atom labels and 30% probability displacement ellipsoids for non-H atoms.
[Figure 2] Fig. 2. Three-dimensional layered structure of the title compound. All H atoms which are not involved in intermolecular interactions are omitted for clarity.
4-Ethoxy-3-methoxybenzaldehyde top
Crystal data top
C10H12O3F(000) = 384
Mr = 180.20Dx = 1.275 Mg m3
Monoclinic, P21/cCu Kα radiation, λ = 1.54180 Å
Hall symbol: -P 2ybcCell parameters from 1676 reflections
a = 11.5314 (16) Åθ = 3.9–71.1°
b = 8.7905 (11) ŵ = 0.78 mm1
c = 9.3363 (13) ÅT = 293 K
β = 97.339 (14)°Needle, white
V = 938.6 (2) Å30.39 × 0.17 × 0.14 mm
Z = 4
Data collection top
Agilent Gemini S
diffractometer
1848 independent reflections
Radiation source: Enhance (Cu) X-ray Source1299 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.021
Detector resolution: 16.3280 pixels mm-1θmax = 73.2°, θmin = 3.9°
ω scansh = 1414
Absorption correction: multi-scan
(CrysAlis PRO; Agilent, 2013)
k = 108
Tmin = 0.933, Tmax = 1.000l = 119
6035 measured reflections
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.047Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.148H-atom parameters constrained
S = 1.04 w = 1/[σ2(Fo2) + (0.0746P)2 + 0.0716P]
where P = (Fo2 + 2Fc2)/3
1848 reflections(Δ/σ)max < 0.001
120 parametersΔρmax = 0.12 e Å3
0 restraintsΔρmin = 0.17 e Å3
Crystal data top
C10H12O3V = 938.6 (2) Å3
Mr = 180.20Z = 4
Monoclinic, P21/cCu Kα radiation
a = 11.5314 (16) ŵ = 0.78 mm1
b = 8.7905 (11) ÅT = 293 K
c = 9.3363 (13) Å0.39 × 0.17 × 0.14 mm
β = 97.339 (14)°
Data collection top
Agilent Gemini S
diffractometer
1848 independent reflections
Absorption correction: multi-scan
(CrysAlis PRO; Agilent, 2013)
1299 reflections with I > 2σ(I)
Tmin = 0.933, Tmax = 1.000Rint = 0.021
6035 measured reflectionsθmax = 73.2°
Refinement top
R[F2 > 2σ(F2)] = 0.047H-atom parameters constrained
wR(F2) = 0.148Δρmax = 0.12 e Å3
S = 1.04Δρmin = 0.17 e Å3
1848 reflectionsAbsolute structure: ?
120 parametersAbsolute structure parameter: ?
0 restraintsRogers parameter: ?
Special details top

Experimental. Absorption correction: empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm (CrysAlis PRO; Agilent, 2013)

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
O10.01326 (13)0.00997 (18)0.78722 (16)0.0954 (5)
O20.27667 (11)0.22381 (13)0.46226 (14)0.0818 (4)
O30.37383 (11)0.00811 (13)0.35924 (13)0.0780 (4)
C10.03443 (17)0.1075 (2)0.7257 (2)0.0824 (5)
H10.01300.20760.74110.099*
C20.12260 (15)0.0833 (2)0.62934 (18)0.0683 (5)
C30.15663 (15)0.0635 (2)0.59500 (18)0.0675 (5)
H30.12300.14700.63480.081*
C40.23881 (14)0.08576 (18)0.50352 (17)0.0642 (4)
C50.29161 (15)0.0414 (2)0.44602 (18)0.0665 (5)
C60.25783 (15)0.1856 (2)0.47925 (19)0.0768 (5)
H60.29180.26960.44060.092*
C70.17310 (17)0.2063 (2)0.5703 (2)0.0793 (6)
H70.15020.30430.59170.095*
C80.22711 (16)0.3550 (2)0.5194 (2)0.0889 (6)
H8A0.14380.35350.49380.133*
H8B0.25880.44470.48040.133*
H8C0.24530.35540.62270.133*
C90.43966 (16)0.1315 (2)0.3099 (2)0.0812 (6)
H9A0.38720.20510.25830.097*
H9B0.48380.18230.39160.097*
C100.52047 (17)0.0694 (3)0.2129 (2)0.0930 (7)
H10A0.47610.02110.13140.140*
H10B0.56590.15070.17990.140*
H10C0.57170.00370.26450.140*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
O10.0975 (10)0.0929 (10)0.1040 (11)0.0069 (8)0.0448 (9)0.0036 (8)
O20.0900 (8)0.0605 (7)0.1034 (9)0.0055 (6)0.0452 (7)0.0059 (6)
O30.0846 (8)0.0715 (8)0.0838 (8)0.0123 (6)0.0332 (7)0.0019 (6)
C10.0844 (12)0.0782 (12)0.0887 (13)0.0103 (10)0.0265 (10)0.0006 (10)
C20.0694 (10)0.0658 (11)0.0714 (10)0.0022 (8)0.0152 (8)0.0024 (8)
C30.0679 (10)0.0652 (10)0.0715 (10)0.0047 (8)0.0170 (8)0.0022 (8)
C40.0661 (9)0.0578 (10)0.0706 (10)0.0041 (7)0.0162 (8)0.0045 (7)
C50.0675 (9)0.0694 (11)0.0643 (9)0.0050 (8)0.0153 (8)0.0017 (8)
C60.0872 (12)0.0633 (11)0.0834 (12)0.0063 (9)0.0239 (10)0.0036 (9)
C70.0920 (13)0.0600 (11)0.0887 (12)0.0049 (9)0.0224 (10)0.0028 (9)
C80.0965 (14)0.0606 (11)0.1171 (16)0.0027 (9)0.0431 (12)0.0010 (10)
C90.0803 (12)0.0827 (12)0.0839 (12)0.0139 (10)0.0235 (10)0.0118 (10)
C100.0837 (13)0.1090 (17)0.0911 (14)0.0149 (11)0.0294 (11)0.0087 (12)
Geometric parameters (Å, º) top
O1—C11.204 (2)C6—C71.387 (2)
O2—C41.3618 (18)C6—H60.9300
O2—C81.421 (2)C7—H70.9300
O3—C51.355 (2)C8—H8A0.9600
O3—C91.433 (2)C8—H8B0.9600
C1—C21.457 (2)C8—H8C0.9600
C1—H10.9300C9—C101.484 (3)
C2—C71.376 (2)C9—H9A0.9700
C2—C31.398 (2)C9—H9B0.9700
C3—C41.368 (2)C10—H10A0.9600
C3—H30.9300C10—H10B0.9600
C4—C51.411 (2)C10—H10C0.9600
C5—C61.374 (2)
C4—O2—C8117.27 (13)C2—C7—H7119.7
C5—O3—C9117.93 (14)C6—C7—H7119.7
O1—C1—C2126.0 (2)O2—C8—H8A109.5
O1—C1—H1117.0O2—C8—H8B109.5
C2—C1—H1117.0H8A—C8—H8B109.5
C7—C2—C3119.20 (16)O2—C8—H8C109.5
C7—C2—C1119.78 (17)H8A—C8—H8C109.5
C3—C2—C1121.02 (17)H8B—C8—H8C109.5
C4—C3—C2120.83 (16)O3—C9—C10108.51 (16)
C4—C3—H3119.6O3—C9—H9A110.0
C2—C3—H3119.6C10—C9—H9A110.0
O2—C4—C3125.22 (15)O3—C9—H9B110.0
O2—C4—C5115.38 (14)C10—C9—H9B110.0
C3—C4—C5119.40 (15)H9A—C9—H9B108.4
O3—C5—C6125.06 (16)C9—C10—H10A109.5
O3—C5—C4115.17 (15)C9—C10—H10B109.5
C6—C5—C4119.77 (16)H10A—C10—H10B109.5
C5—C6—C7120.13 (17)C9—C10—H10C109.5
C5—C6—H6119.9H10A—C10—H10C109.5
C7—C6—H6119.9H10B—C10—H10C109.5
C2—C7—C6120.65 (17)
O1—C1—C2—C7177.57 (19)O2—C4—C5—O30.8 (2)
O1—C1—C2—C32.7 (3)C3—C4—C5—O3178.53 (14)
C7—C2—C3—C40.2 (3)O2—C4—C5—C6178.87 (16)
C1—C2—C3—C4179.46 (15)C3—C4—C5—C61.7 (3)
C8—O2—C4—C30.3 (3)O3—C5—C6—C7179.56 (16)
C8—O2—C4—C5179.05 (16)C4—C5—C6—C70.8 (3)
C2—C3—C4—O2179.20 (15)C3—C2—C7—C60.8 (3)
C2—C3—C4—C51.5 (3)C1—C2—C7—C6179.51 (17)
C9—O3—C5—C66.9 (3)C5—C6—C7—C20.5 (3)
C9—O3—C5—C4173.41 (14)C5—O3—C9—C10177.85 (15)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C1—H1···O1i0.932.673.547 (3)157
C10—H10B···O2ii0.962.623.525 (2)156
Symmetry codes: (i) x, y1/2, z+3/2; (ii) x+1, y1/2, z+1/2.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C1—H1···O1i0.932.673.547 (3)157.3
C10—H10B···O2ii0.962.623.525 (2)156.4
Symmetry codes: (i) x, y1/2, z+3/2; (ii) x+1, y1/2, z+1/2.
Acknowledgements top

This work was supported by the Ministry of Education, Science and Technological development of the Republic of Serbia (projects No. 172014, 172035 and 172034).

references
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