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Acta Cryst. (2010). E66, o1433    [ doi:10.1107/S1600536810018659 ]

2-(2,2-Dimethyl-2,3-dihydro-1-benzofuran-7-yloxy)acetic acid monohydrate

L.-T. Yang, J. Ye, X.-F. Luo and A.-X. Hu

Abstract top

In the title compound, C12H14O4·H2O, the dihydrobenzofuran ring adopts an envelope conformation with the substituted C atom 0.142 (1) Å out of the least-squares plane. In the crystal, the components are linked via intermolecular Owater-H...O and O-H...Owater hydrogen-bonding interactions, forming a three-dimensional network.

Comment top

2-(2,2-dimethyl-2,3-dihydrobenzofuran-7-yloxy)acetic acid monohydrate (I), C12H14O4.H2O, is a derivative of commercially available Carbofuran which is a carbamate-based insecticide (Xu et al., 2005; Li,et al., 2009), Herein we report the synthesis and structure of the title compound.

The dihedral angle between the plane C7—C3—C2—O1 and the plane C8—O1—C7 is 23.20 (14)°, which indicates that the dihydrobenzofuran ring is in an envelope conformation (Fig. 1). Its substituted C8 atom is 0.142 (1) Å out of the least-squares plane defined by O1, C2, C3, C7 and C8. In the crystal structure, intermolecular Owater—H···O and and O—H···Owater hydrogen bonds link organic molecules and water molecules into a three-dimensional network (Fig. 2).

Related literature top

For background to carbamate-based insecticides, see: Xu et al. (2005); Li et al. (2009).

Experimental top

0.10 mol 2,2-dimethyl-2,3-dihydrobenzofuran-7-ol , 0.12 mol chloroacetic acid, 0.25 mol sodium hydroxide and 70 ml water were stirred and heated under reflux for 3 h. Then the reaction mixture was cooled to 283 K and 15 ml concentrated hydrochloric acid was added to give 2-(2,2-dimethyl-2,3-dihydrobenzofuran-7-yloxy)acetic acid hydrate as amber solid of 21.91 g, yield 98.5%. Single colourless crystals suitable for X-ray diffraction were obtained by slow evaporation of an ethyl acetate solution at room temperature over a period of nine days.

1H NMR (CDCl3,300 MHz), δ: 1.50(s, 6H, 2CH3), 3.03(s,2H,CH2), 4.71(s,2H,OCH2), 6.74~6.83(m, 2H,ArH), 6.84~6.87(m,1H,ArH).

Refinement top

All H atoms except for the water H atoms were refined in the riding-model approximation, with C—H distances of 0.98 Å (methyl), 0.95Å (aromatic) and 0.99Å (methylene), and with Uiso(H)=1.5 or 1.2Ueq(carrier). The water H atoms were located in Fourier syntheses. Their positions were refined with distance restraints of 0.85 (2) Å, with Uiso(H) values set equal to 1.5Ueq(O). The carboxylate proton was placed in a calculated position.

Computing details top

Data collection: SMART (Bruker, 2001); cell refinement: SAINT-Plus (Bruker, 2003); data reduction: SAINT-Plus (Bruker, 2003); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. The molecular structure of the title compound showing 30% probability displacement ellipsoids. H atoms are drawn as spheres with arbitrary radius.
[Figure 2] Fig. 2. A packing diagram for the title compound, viewed down [010]. H atoms bonded to C atoms have been omitted for clarity.
2-(2,2-Dimethyl-2,3-dihydro-1-benzofuran-7-yloxy)acetic acid monohydrate top
Crystal data top
C12H14O4·H2OF(000) = 512
Mr = 240.25Dx = 1.288 Mg m−3
Monoclinic, P21/cMelting point: 383.2 K
Hall symbol: -P 2ybcMo Kα radiation, λ = 0.71073 Å
a = 10.1692 (7) ÅCell parameters from 3163 reflections
b = 9.2516 (6) Åθ = 2.3–27.1°
c = 15.3647 (11) ŵ = 0.10 mm−1
β = 121.000 (1)°T = 173 K
V = 1239.06 (15) Å3Block, colorless
Z = 40.46 × 0.42 × 0.30 mm
Data collection top
Bruker SMART 1000 CCD
diffractometer		2697 independent reflections
Radiation source: fine-focus sealed tube2120 reflections with I > 2σ(I)
graphiteRint = 0.019
ω scansθmax = 27.1°, θmin = 2.3°
Absorption correction: multi-scan
(SADABS; Sheldrick, 2004)		h = −12→11
Tmin = 0.955, Tmax = 0.971k = −7→11
6151 measured reflectionsl = −19→19
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)] = 0.039Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.111H atoms treated by a mixture of independent and constrained refinement
S = 1.04 w = 1/[σ2(Fo2) + (0.0517P)2 + 0.395P]
where P = (Fo2 + 2Fc2)/3
2697 reflections(Δ/σ)max = 0.001
163 parametersΔρmax = 0.25 e Å−3
0 restraintsΔρmin = −0.16 e Å−3
Crystal data top
C12H14O4·H2OV = 1239.06 (15) Å3
Mr = 240.25Z = 4
Monoclinic, P21/cMo Kα radiation
a = 10.1692 (7) ŵ = 0.10 mm−1
b = 9.2516 (6) ÅT = 173 K
c = 15.3647 (11) Å0.46 × 0.42 × 0.30 mm
β = 121.000 (1)°
Data collection top
Bruker SMART 1000 CCD
diffractometer		2697 independent reflections
Absorption correction: multi-scan
(SADABS; Sheldrick, 2004)		2120 reflections with I > 2σ(I)
Tmin = 0.955, Tmax = 0.971Rint = 0.019
6151 measured reflectionsθmax = 27.1°
Refinement top
R[F2 > 2σ(F2)] = 0.039H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.111Δρmax = 0.25 e Å−3
S = 1.04Δρmin = −0.16 e Å−3
2697 reflectionsAbsolute structure: ?
163 parametersFlack parameter: ?
0 restraintsRogers parameter: ?
Special details top

Experimental. 1H NMR (CDCl3,300 MHz), delta: 1.50(s, 6H, 2CH3), 3.03(s,2H,CH2), 4.71(s,2H,OCH2), 6.74~6.83(m, 2H,ArH), 6.84~6.87(m,1H,ArH).

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. 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 (Å2) top
xyzUiso*/Ueq
C10.31319 (14)−0.08179 (14)0.92110 (10)0.0262 (3)
C20.20485 (15)0.01702 (14)0.85462 (10)0.0267 (3)
C30.12122 (16)0.10425 (15)0.88122 (11)0.0303 (3)
C40.14753 (18)0.09740 (17)0.97925 (12)0.0368 (3)
H40.09040.15590.99890.044*
C50.25901 (18)0.00335 (16)1.04785 (11)0.0360 (3)
H50.2796−0.00051.11550.043*
C60.34170 (16)−0.08577 (15)1.01982 (10)0.0304 (3)
H60.4176−0.14931.06820.036*
C70.01064 (17)0.19009 (17)0.78777 (12)0.0377 (4)
H7A0.01010.29340.80430.045*
H7B−0.09490.15130.75620.045*
C80.07678 (17)0.16885 (15)0.71767 (11)0.0346 (3)
C9−0.0406 (2)0.1410 (2)0.60728 (12)0.0498 (4)
H9A0.01190.11320.57130.075*
H9B−0.10060.22900.57670.075*
H9C−0.10910.06280.60220.075*
C100.1872 (2)0.28869 (18)0.73154 (13)0.0449 (4)
H10A0.26040.30300.80410.067*
H10B0.12990.37830.70210.067*
H10C0.24270.26240.69730.067*
C110.48288 (15)−0.27410 (15)0.94317 (10)0.0288 (3)
H11A0.4348−0.33620.97160.035*
H11B0.5754−0.22871.00020.035*
C120.52628 (16)−0.36346 (15)0.87960 (10)0.0292 (3)
O10.16890 (11)0.03407 (10)0.75592 (7)0.0308 (2)
O20.37837 (11)−0.16642 (10)0.87999 (7)0.0300 (2)
O30.48249 (14)−0.34112 (12)0.79128 (8)0.0443 (3)
O40.61833 (13)−0.46912 (11)0.93349 (8)0.0387 (3)
H4A0.6434−0.51640.89760.058*
O5W0.28781 (13)−0.12943 (12)0.65785 (8)0.0354 (3)
H5A0.259 (2)−0.079 (2)0.6924 (15)0.053*
H5B0.349 (2)−0.191 (2)0.7004 (15)0.053*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
C10.0261 (6)0.0248 (6)0.0279 (6)−0.0024 (5)0.0140 (5)−0.0013 (5)
C20.0286 (7)0.0257 (7)0.0248 (6)−0.0032 (5)0.0131 (5)−0.0004 (5)
C30.0302 (7)0.0274 (7)0.0351 (7)0.0001 (5)0.0181 (6)0.0001 (6)
C40.0434 (8)0.0355 (8)0.0406 (8)0.0006 (7)0.0282 (7)−0.0035 (6)
C50.0464 (9)0.0375 (8)0.0300 (7)−0.0025 (6)0.0238 (7)−0.0011 (6)
C60.0336 (7)0.0292 (7)0.0271 (7)−0.0013 (6)0.0148 (6)0.0021 (6)
C70.0374 (8)0.0356 (8)0.0392 (8)0.0077 (6)0.0190 (7)0.0032 (6)
C80.0383 (8)0.0304 (7)0.0315 (7)0.0115 (6)0.0153 (6)0.0067 (6)
C90.0494 (10)0.0519 (10)0.0332 (8)0.0185 (8)0.0106 (7)0.0038 (7)
C100.0559 (10)0.0360 (8)0.0472 (9)0.0062 (7)0.0297 (8)0.0091 (7)
C110.0310 (7)0.0279 (7)0.0256 (6)0.0040 (5)0.0132 (5)0.0053 (5)
C120.0307 (7)0.0263 (7)0.0295 (7)0.0009 (5)0.0147 (6)0.0032 (6)
O10.0356 (5)0.0299 (5)0.0253 (5)0.0089 (4)0.0147 (4)0.0050 (4)
O20.0343 (5)0.0298 (5)0.0247 (5)0.0078 (4)0.0145 (4)0.0043 (4)
O30.0615 (7)0.0419 (6)0.0295 (5)0.0174 (5)0.0234 (5)0.0061 (5)
O40.0495 (6)0.0363 (6)0.0347 (6)0.0162 (5)0.0249 (5)0.0089 (5)
O5W0.0475 (6)0.0314 (6)0.0309 (5)0.0032 (5)0.0227 (5)0.0026 (4)
Geometric parameters (Å, °) top
C1—O21.3720 (16)C8—C101.513 (2)
C1—C61.3903 (19)C9—H9A0.9800
C1—C21.3906 (18)C9—H9B0.9800
C2—O11.3738 (16)C9—H9C0.9800
C2—C31.3781 (19)C10—H10A0.9800
C3—C41.389 (2)C10—H10B0.9800
C3—C71.514 (2)C10—H10C0.9800
C4—C51.386 (2)C11—O21.4147 (16)
C4—H40.9500C11—C121.509 (2)
C5—C61.395 (2)C11—H11A0.9900
C5—H50.9500C11—H11B0.9900
C6—H60.9500C12—O31.2082 (17)
C7—C81.548 (2)C12—O41.3111 (16)
C7—H7A0.9900O4—H4A0.8400
C7—H7B0.9900O5W—H5A0.86 (2)
C8—O11.4868 (16)O5W—H5B0.85 (2)
C8—C91.511 (2)
O2—C1—C6127.47 (12)C9—C8—C7115.32 (13)
O2—C1—C2115.14 (11)C10—C8—C7111.45 (13)
C6—C1—C2117.38 (12)C8—C9—H9A109.5
O1—C2—C3113.96 (12)C8—C9—H9B109.5
O1—C2—C1123.09 (12)H9A—C9—H9B109.5
C3—C2—C1122.93 (13)C8—C9—H9C109.5
C2—C3—C4119.42 (13)H9A—C9—H9C109.5
C2—C3—C7107.23 (12)H9B—C9—H9C109.5
C4—C3—C7133.33 (13)C8—C10—H10A109.5
C5—C4—C3118.58 (13)C8—C10—H10B109.5
C5—C4—H4120.7H10A—C10—H10B109.5
C3—C4—H4120.7C8—C10—H10C109.5
C4—C5—C6121.54 (13)H10A—C10—H10C109.5
C4—C5—H5119.2H10B—C10—H10C109.5
C6—C5—H5119.2O2—C11—C12107.97 (11)
C1—C6—C5120.07 (13)O2—C11—H11A110.1
C1—C6—H6120.0C12—C11—H11A110.1
C5—C6—H6120.0O2—C11—H11B110.1
C3—C7—C8102.50 (11)C12—C11—H11B110.1
C3—C7—H7A111.3H11A—C11—H11B108.4
C8—C7—H7A111.3O3—C12—O4124.54 (13)
C3—C7—H7B111.3O3—C12—C11124.88 (13)
C8—C7—H7B111.3O4—C12—C11110.58 (11)
H7A—C7—H7B109.2C2—O1—C8106.73 (10)
O1—C8—C9105.86 (12)C1—O2—C11117.15 (10)
O1—C8—C10106.75 (12)C12—O4—H4A109.5
C9—C8—C10112.51 (14)H5A—O5W—H5B103.8 (18)
O1—C8—C7104.03 (11)
O2—C1—C2—O1−2.53 (19)C4—C3—C7—C8166.32 (16)
C6—C1—C2—O1178.40 (12)C3—C7—C8—O122.35 (15)
O2—C1—C2—C3175.87 (12)C3—C7—C8—C9137.81 (14)
C6—C1—C2—C3−3.2 (2)C3—C7—C8—C10−92.32 (14)
O1—C2—C3—C4−179.74 (12)O2—C11—C12—O32.6 (2)
C1—C2—C3—C41.7 (2)O2—C11—C12—O4−177.34 (11)
O1—C2—C3—C71.47 (16)C3—C2—O1—C813.73 (15)
C1—C2—C3—C7−177.06 (13)C1—C2—O1—C8−167.74 (12)
C2—C3—C4—C50.7 (2)C9—C8—O1—C2−144.32 (13)
C7—C3—C4—C5179.06 (15)C10—C8—O1—C295.60 (13)
C3—C4—C5—C6−1.5 (2)C7—C8—O1—C2−22.37 (14)
O2—C1—C6—C5−176.62 (13)C6—C1—O2—C112.41 (19)
C2—C1—C6—C52.3 (2)C2—C1—O2—C11−176.54 (11)
C4—C5—C6—C1−0.1 (2)C12—C11—O2—C1173.93 (11)
C2—C3—C7—C8−15.13 (15)
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O5W—H5A···O10.86 (2)1.95 (2)2.8104 (15)173.0 (19)
O5W—H5B···O30.85 (2)1.94 (2)2.7888 (15)176.5 (19)
O4—H4A···O5Wi0.841.712.5416 (15)171
Symmetry codes: (i) −x+1, y−1/2, −z+3/2.
Table 1
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O5W—H5A···O10.86 (2)1.95 (2)2.8104 (15)173.0 (19)
O5W—H5B···O30.85 (2)1.94 (2)2.7888 (15)176.5 (19)
O4—H4A···O5Wi0.841.712.5416 (15)171
Symmetry codes: (i) −x+1, y−1/2, −z+3/2.
Acknowledgements top

This work was supported by the Central University Basic Scientific Research Fund of Hunan University.

references
References top

Bruker (2001). SMART. Bruker AXS Inc., Madison, Wisconsin, USA.

Bruker (2003). SAINT-Plus. Bruker AXS Inc., Madison, Wisconsin, USA.

Li, W.-S., Li, L. & Li, J.-S. (2009). Acta Cryst. E65, o2928.

Sheldrick, G. M. (2004). SADABS. University of Göttingen, Germany.

Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122.

Xu, L.-Z., Yu, G.-P. & Yang, S.-H. (2005). Acta Cryst. E61, o1924–o1926.