Di­methyl 2-nitro­terephthalate

In the mol­ecule of the title compound, C₁₀H₉NO₆, the two ester groups and the nitro group are inclined at 9.2 (2), 123.3 (6) and 135.2 (5)°, respectively to the mean plane of the benzene ring. In the crystal structure, mol­ecules are stacked along the a axis, without any π–π inter­actions. The stacked columns are linked together by non-classical intermolecular interactions of the type C—H⋯O.

Related literature

For the use of the title compound in the preparation of 2-amino-dimethyl-terephthalic acid, an inter­mediate for dyes, see: Niu et al. (2002). For related structures, see: Brisse & Pérez (1976); Huang & Liang (2007).

Experimental

Crystal data

• C₁₀H₉NO₆

• M_r = 239.18

• Monoclinic, P 2₁ /n

• a = 6.9080 (14) Å

• b = 12.662 (3) Å

• c = 12.231 (2) Å

• β = 98.18 (3)°

• V = 1058.9 (4) ų

• Z = 4

• Mo Kα radiation

• μ = 0.13 mm⁻¹

• T = 293 (2) K

• 0.30 × 0.30 × 0.10 mm

Data collection

• Enraf–Nonius CAD-4 diffractometer

• Absorption correction: ψ scan (CAD-4 Software; Enraf–Nonius, 1989) T_min = 0.963, T_max = 0.987

• 2052 measured reflections

• 1889 independent reflections

• 1245 reflections with I > 2σ(I)

• R_int = 0.057

• 3 standard reflections every 200 reflections intensity decay: 2%

Refinement

• R[F² > 2σ(F²)] = 0.078

• wR(F²) = 0.201

• S = 1.00

• 1889 reflections

• 156 parameters

• H-atom parameters constrained

• Δρ_max = 0.29 e Å⁻³

• Δρ_min = −0.31 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C1—H1B⋯O2^i	0.96	2.59	3.523 (7)	164
C4—H4A⋯O2^ii	0.93	2.54	3.185 (5)	127
Symmetry codes: (i) -x+2, -y, -z+2; (ii) -x+1, -y, -z+2.

Data collection: CAD-4 Software (Enraf–Nonius, 1989); cell refinement: CAD-4 Software; data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.

Supporting information

S1. Comment

The title compound, (I), is useful as a raw material for the preparation of 2-amino-dimethyl-terephthalic acid, which is used as an important intermediate for dyes (Niu et al., 2002). The structures of dimethyl terephthalate (Brisse & Pérez, 1976) and dimethyl 2,3-dihydroxyterephthalate (Huang & Liang, 2007) which are closely related to the title compound have already been reported. In this article, we report the crystal structure of (I). A view of the molecule of (I) is presented in Fig. 1. The bond lengths and angles are within expected ranges. The C1/O1/C2/O2, C10/O6/C9/O5 and O3/N/O4 planes form dihedral angles of 9.2 (2), 123.3 (6) and 135.2 (5)°, respectively, with the C3—C8 plane. In the crystal structure, the molecules are stacked along the a axis, without any π-π interactions. The stacked columns are linked together by non-classical intermolecular interactions of the type C—H···O (Table 1).

Related literature

For the use of the title compound in the preparation of 2-amino-dimethyl-terephthalic acid, an intermediate for dyes, see: Niu et al. (2002). For related structures, see: Brisse & Pérez, (1976); Huang & Liang, (2007).

S2. Experimental

A sample of commercial 2-nitro-dimethyl-terephthalic acid (Aldrich) was crystalized by slow evaporation of a solution in methanol.

S3. Refinement

Positional parameters of all the H atoms bonded to C atoms were calculated geometrically and were allowed to ride on the C atoms to which they are bonded, with H—C(aryl) = 0.93 Å and U_iso(H) = 1.2U_eq(C) or with H—C(methyl) = 0.96 Å and U_iso(H) = 1.5U_eq(C).

Computing details

Data collection: CAD-4 Software (Enraf–Nonius,1989); cell refinement: CAD-4 Software (Enraf–Nonius,1989); data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXL97 (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures

Fig. 1. A view of the molecule of (I) with the atomic numbering scheme. Displacement ellipsoids were drawn at the 30% probability level.

Dimethyl 2-nitroterephthalate

Crystal data

C10H9NO6	F(000) = 496
Mr = 239.18	Dx = 1.500 Mg m^−3
Monoclinic, P21/n	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2yn	Cell parameters from 25 reflections
a = 6.9080 (14) Å	θ = 10–13°
b = 12.662 (3) Å	µ = 0.13 mm^−1
c = 12.231 (2) Å	T = 293 K
β = 98.18 (3)°	Block, colourless
V = 1058.9 (4) Å^3	0.30 × 0.30 × 0.10 mm
Z = 4

Data collection

Enraf–Nonius CAD-4 diffractometer	1245 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.057
Graphite monochromator	θmax = 25.3°, θmin = 2.3°
ω/2θ scans	h = −8→8
Absorption correction: ψ scan (CAD-4 Software; Enraf–Nonius,1989)	k = 0→15
Tmin = 0.963, Tmax = 0.987	l = 0→14
2052 measured reflections	3 standard reflections every 200 reflections
1889 independent reflections	intensity decay: 2%

Refinement

Refinement on F^2	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F^2 > 2σ(F^2)] = 0.078	H-atom parameters constrained
wR(F^2) = 0.201	w = 1/[σ^2(Fo^2) + (0.05P)^2 + 3.5P] where P = (Fo^2 + 2Fc^2)/3
S = 1.01	(Δ/σ)max < 0.001
1889 reflections	Δρmax = 0.29 e Å^−3
156 parameters	Δρmin = −0.31 e Å^−3
0 restraints	Extinction correction: SHELXL97 (Sheldrick, 2008)
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.053 (8)

Special details

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
O6	0.0321 (5)	0.4552 (3)	0.8800 (3)	0.0576 (9)
O2	0.7697 (5)	0.0539 (2)	1.0189 (3)	0.0634 (10)
O1	0.8957 (5)	0.2101 (3)	1.0787 (3)	0.0584 (9)
O5	0.0234 (5)	0.3733 (3)	0.7173 (3)	0.0633 (10)
O4	0.1497 (6)	0.0806 (3)	0.7385 (3)	0.0755 (12)
N	0.1105 (6)	0.1519 (3)	0.8006 (3)	0.0545 (11)
C3	0.5871 (6)	0.2093 (3)	0.9698 (3)	0.0397 (10)
O3	−0.0550 (5)	0.1733 (3)	0.8156 (4)	0.0806 (13)
C2	0.7594 (7)	0.1483 (3)	1.0248 (4)	0.0445 (11)
C8	0.5802 (7)	0.3193 (3)	0.9806 (4)	0.0489 (11)
H8A	0.6838	0.3561	1.0201	0.059*
C6	0.2593 (6)	0.3208 (3)	0.8712 (3)	0.0412 (10)
C7	0.4154 (7)	0.3717 (3)	0.9309 (4)	0.0516 (12)
H7A	0.4098	0.4447	0.9382	0.062*
C9	0.0911 (7)	0.3822 (3)	0.8120 (4)	0.0470 (11)
C10	−0.1157 (8)	0.5271 (4)	0.8335 (5)	0.0629 (14)
H10A	−0.1305	0.5819	0.8859	0.094*
H10B	−0.2373	0.4901	0.8155	0.094*
H10C	−0.0790	0.5579	0.7677	0.094*
C5	0.2728 (6)	0.2107 (3)	0.8613 (3)	0.0386 (10)
C4	0.4337 (7)	0.1556 (3)	0.9090 (4)	0.0465 (11)
H4A	0.4398	0.0827	0.9006	0.056*
C1	1.0681 (8)	0.1571 (5)	1.1324 (5)	0.0769 (17)
H1A	1.1662	0.2086	1.1583	0.115*
H1B	1.1174	0.1106	1.0808	0.115*
H1C	1.0357	0.1170	1.1939	0.115*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
O6	0.073 (2)	0.0433 (18)	0.060 (2)	0.0163 (17)	0.0214 (17)	−0.0090 (16)
O2	0.075 (2)	0.0335 (18)	0.087 (3)	0.0090 (17)	0.0289 (19)	0.0070 (17)
O1	0.062 (2)	0.0383 (18)	0.076 (2)	0.0080 (16)	0.0165 (18)	0.0019 (17)
O5	0.065 (2)	0.075 (3)	0.049 (2)	0.0151 (19)	0.0045 (17)	−0.0057 (18)
O4	0.099 (3)	0.048 (2)	0.081 (3)	−0.005 (2)	0.017 (2)	−0.028 (2)
N	0.063 (3)	0.042 (2)	0.061 (3)	−0.017 (2)	0.019 (2)	−0.001 (2)
C3	0.051 (3)	0.029 (2)	0.044 (2)	0.0019 (19)	0.0248 (19)	0.0009 (18)
O3	0.052 (2)	0.083 (3)	0.113 (3)	−0.017 (2)	0.036 (2)	−0.010 (3)
C2	0.054 (3)	0.032 (2)	0.053 (3)	0.001 (2)	0.025 (2)	0.004 (2)
C8	0.064 (3)	0.027 (2)	0.058 (3)	−0.002 (2)	0.015 (2)	−0.005 (2)
C6	0.053 (3)	0.029 (2)	0.045 (2)	0.0025 (19)	0.020 (2)	−0.0016 (19)
C7	0.071 (3)	0.023 (2)	0.061 (3)	0.006 (2)	0.010 (2)	−0.004 (2)
C9	0.059 (3)	0.036 (2)	0.052 (3)	−0.002 (2)	0.025 (2)	−0.002 (2)
C10	0.068 (3)	0.052 (3)	0.071 (3)	0.018 (3)	0.021 (3)	0.002 (3)
C5	0.048 (2)	0.030 (2)	0.043 (2)	0.0010 (19)	0.0230 (19)	−0.0007 (18)
C4	0.059 (3)	0.023 (2)	0.065 (3)	−0.007 (2)	0.035 (2)	−0.005 (2)
C1	0.076 (4)	0.059 (4)	0.099 (5)	0.016 (3)	0.026 (3)	0.006 (3)

Geometric parameters (Å, º)

O6—C9	1.345 (5)	C8—H8A	0.9300
O6—C10	1.425 (6)	C6—C7	1.373 (6)
O2—C2	1.200 (5)	C6—C5	1.404 (6)
O1—C2	1.325 (5)	C6—C9	1.497 (6)
O1—C1	1.442 (6)	C7—H7A	0.9300
O5—C9	1.191 (5)	C10—H10A	0.9600
O4—N	1.234 (5)	C10—H10B	0.9600
N—O3	1.214 (5)	C10—H10C	0.9600
N—C5	1.458 (6)	C5—C4	1.371 (6)
C3—C4	1.383 (6)	C4—H4A	0.9300
C3—C8	1.401 (6)	C1—H1A	0.9600
C3—C2	1.496 (6)	C1—H1B	0.9600
C8—C7	1.381 (6)	C1—H1C	0.9600
C9—O6—C10	117.2 (4)	O5—C9—C6	126.3 (4)
C2—O1—C1	115.7 (4)	O6—C9—C6	109.9 (4)
O3—N—O4	123.5 (4)	O6—C10—H10A	109.5
O3—N—C5	118.7 (4)	O6—C10—H10B	109.5
O4—N—C5	117.8 (4)	H10A—C10—H10B	109.5
C4—C3—C8	120.4 (4)	O6—C10—H10C	109.5
C4—C3—C2	119.2 (4)	H10A—C10—H10C	109.5
C8—C3—C2	120.5 (4)	H10B—C10—H10C	109.5
O2—C2—O1	125.0 (4)	C4—C5—C6	121.9 (4)
O2—C2—C3	122.5 (4)	C4—C5—N	118.4 (4)
O1—C2—C3	112.5 (4)	C6—C5—N	119.7 (4)
C7—C8—C3	118.3 (4)	C5—C4—C3	119.4 (4)
C7—C8—H8A	120.9	C5—C4—H4A	120.3
C3—C8—H8A	120.9	C3—C4—H4A	120.3
C7—C6—C5	117.1 (4)	O1—C1—H1A	109.5
C7—C6—C9	120.7 (4)	O1—C1—H1B	109.5
C5—C6—C9	122.0 (4)	H1A—C1—H1B	109.5
C6—C7—C8	123.0 (4)	O1—C1—H1C	109.5
C6—C7—H7A	118.5	H1A—C1—H1C	109.5
C8—C7—H7A	118.5	H1B—C1—H1C	109.5
O5—C9—O6	123.7 (5)
C1—O1—C2—O2	0.6 (7)	C7—C6—C9—O6	−48.0 (5)
C1—O1—C2—C3	−179.0 (4)	C5—C6—C9—O6	137.2 (4)
C4—C3—C2—O2	−0.5 (6)	C7—C6—C5—C4	0.1 (6)
C8—C3—C2—O2	178.9 (4)	C9—C6—C5—C4	175.1 (4)
C4—C3—C2—O1	179.1 (4)	C7—C6—C5—N	179.0 (4)
C8—C3—C2—O1	−1.4 (6)	C9—C6—C5—N	−6.1 (6)
C4—C3—C8—C7	1.3 (7)	O3—N—C5—C4	135.0 (5)
C2—C3—C8—C7	−178.2 (4)	O4—N—C5—C4	−43.2 (6)
C5—C6—C7—C8	−0.3 (7)	O3—N—C5—C6	−43.9 (6)
C9—C6—C7—C8	−175.3 (4)	O4—N—C5—C6	138.0 (4)
C3—C8—C7—C6	−0.4 (7)	C6—C5—C4—C3	0.7 (6)
C10—O6—C9—O5	−1.9 (7)	N—C5—C4—C3	−178.1 (4)
C10—O6—C9—C6	174.5 (4)	C8—C3—C4—C5	−1.5 (6)
C7—C6—C9—O5	128.2 (5)	C2—C3—C4—C5	178.0 (4)
C5—C6—C9—O5	−46.5 (7)

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
C1—H1B···O2^i	0.96	2.59	3.523 (7)	164
C4—H4A···O2^ii	0.93	2.54	3.185 (5)	127

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