organic compounds
4-Bromo-5-[(5,5-dimethyl-4,5-dihydroisoxazol-3-yl)sulfonylmethyl]-3-methyl-1-(2,2,2-trifluoroethyl)-1H-pyrazole
aKey Laboratory of Pesticide Chemistry and Application, Ministry of Agriculture, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, People's Republic of China
*Correspondence e-mail: jning502@yahoo.com.cn
In the title compound, C12H15BrF3N3O3S, which has potential herbicidal activity, the molecule is twisted, as indicated by the C—S—C—C torsion angle of 67.86 (19)° for the atoms linking the ring systems. An intramolecular C—H⋯F short contact occurs and intermolecular C—H⋯O interactions link the molecules in the crystal.
Related literature
For background to pyrazoles and their pharmacological and pharmaceutical applications, see: Aiello et al. (2000); Hirai et al. (2002); Lahm et al. (2007); Meegalla et al. (2004); Ohno et al. (2004); Shiga et al. (2003); Sivaprasad et al. (2006); Vicentini et al. (2005); Waldrep et al. (1990). The trifluoromethyl group is present in many biologically active pharmaceutical and agrochemical compounds, presumably due to its increased and relatively small size, see: Welch (1987).
Experimental
Crystal data
|
Refinement
|
Data collection: CrystalClear (Rigaku, 2008); cell CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536809040380/hb5125sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809040380/hb5125Isup2.hkl
4-Bromo-5-[(5,5-dimethyl-4,5-dihydroisoxazol-3-yl)sulfonylmethyl]-3-methyl-1-(2,2,2-trifluoroethyl)-1H-pyrazole (0.2 g) was dissolved in acetone (50 ml) at room temperature. Colourless crystals of the title compound (I) were obtained through slow evaporation after two weeks.
The H atoms were placed at calculated positions, with C—H=0.93–0.98 Å, and were included in the
in the riding model approximation with Uiso(H) set to 1.2 - 1.5Ueq(C).Pyrazole derivatives represent one of the most important classes of organic
possessing a wide spectrum of biological activities in agrochemicals such as insecticidal (Lahm et al., 2007; Meegalla et al., 2004; Shiga et al., 2003), fungicidal (Aiello et al., 2000; Sivaprasad et al., 2006), herbicidal (Ohno et al., 2004; Vicentini et al., 2005; Waldrep et al., 1990) activities. Some pyrazole derivatives are in use as herbicides such as pyrazolate, pyrazoxyfen, benzofenap, pyraflufen-ethyl, fluazolate and pyrazosulfuron-ethyl (Hirai et al.,2002). The trifluoromethyl moiety is particularly encountered in many biologically active pharmaceutical and agrochemical compounds presumably due to its increased and relatively small size (Welch 1987). Recently, we introduced trifluoromethyl to forming a novel title compound (I) with high herbicidal activity that has not been reported in literatures. The of the title compound is shown in Fig. 1.For background to pyrazoles and their pharmacological and pharmaceutical applications, see: Aiello et al. (2000); Hirai et al. (2002); Lahm et al. (2007); Meegalla et al. (2004); Ohno et al. (2004); Shiga et al. (2003); Sivaprasad et al. (2006); Vicentini et al. (2005); Waldrep et al. (1990). The trifluoromethyl group is present in many biologically active pharmaceutical and agrochemical compounds, presumably due to its increased
and relatively small size, see: Welch (1987).Data collection: CrystalClear (Rigaku, 2008); cell
CrystalClear (Rigaku, 2008); data reduction: CrystalClear (Rigaku, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).Fig. 1. The molecular structure of the title compound, showing 50° probability displacement ellipsoids and the atom-numbering scheme. |
C12H15BrF3N3O3S | F(000) = 840 |
Mr = 418.24 | Dx = 1.730 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 5465 reflections |
a = 16.127 (3) Å | θ = 1.5–27.5° |
b = 5.4356 (11) Å | µ = 2.74 mm−1 |
c = 19.135 (4) Å | T = 173 K |
β = 106.85 (3)° | Slab, colourless |
V = 1605.3 (6) Å3 | 0.16 × 0.15 × 0.05 mm |
Z = 4 |
Rigaku MM007HF + CCD (Saturn724+) diffractometer | 3614 independent reflections |
Radiation source: Rotating Anode | 3353 reflections with I > 2σ(I) |
Confocal monochromator | Rint = 0.040 |
Detector resolution: 28.5714 pixels mm-1 | θmax = 27.5°, θmin = 1.5° |
ω scans at fixed χ = 45° | h = −20→18 |
Absorption correction: numerical (CrystalClear; Rigaku, 2008) | k = −7→6 |
Tmin = 0.668, Tmax = 0.875 | l = −21→24 |
11131 measured reflections |
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: inferred from neighbouring sites |
wR(F2) = 0.093 | H-atom parameters constrained |
S = 1.14 | w = 1/[σ2(Fo2) + (0.0399P)2 + 1.0315P] where P = (Fo2 + 2Fc2)/3 |
3614 reflections | (Δ/σ)max = 0.001 |
211 parameters | Δρmax = 0.44 e Å−3 |
0 restraints | Δρmin = −0.50 e Å−3 |
C12H15BrF3N3O3S | V = 1605.3 (6) Å3 |
Mr = 418.24 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 16.127 (3) Å | µ = 2.74 mm−1 |
b = 5.4356 (11) Å | T = 173 K |
c = 19.135 (4) Å | 0.16 × 0.15 × 0.05 mm |
β = 106.85 (3)° |
Rigaku MM007HF + CCD (Saturn724+) diffractometer | 3614 independent reflections |
Absorption correction: numerical (CrystalClear; Rigaku, 2008) | 3353 reflections with I > 2σ(I) |
Tmin = 0.668, Tmax = 0.875 | Rint = 0.040 |
11131 measured reflections |
R[F2 > 2σ(F2)] = 0.034 | 0 restraints |
wR(F2) = 0.093 | H-atom parameters constrained |
S = 1.14 | Δρmax = 0.44 e Å−3 |
3614 reflections | Δρmin = −0.50 e Å−3 |
211 parameters |
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. |
x | y | z | Uiso*/Ueq | ||
Br1 | 0.445686 (15) | 0.94374 (5) | 0.090555 (14) | 0.03063 (10) | |
S1 | 0.36847 (3) | 0.46277 (11) | 0.24140 (3) | 0.01880 (13) | |
F1 | 0.05557 (10) | 0.1917 (4) | 0.03774 (10) | 0.0506 (5) | |
F2 | 0.10792 (11) | 0.5508 (4) | 0.06883 (11) | 0.0533 (5) | |
F3 | 0.09624 (11) | 0.4150 (4) | −0.03880 (9) | 0.0446 (5) | |
O1 | 0.34862 (11) | 0.5488 (4) | 0.30560 (9) | 0.0302 (4) | |
O2 | 0.35701 (10) | 0.2071 (3) | 0.22232 (9) | 0.0278 (4) | |
O3 | 0.60544 (10) | 0.5023 (3) | 0.23928 (9) | 0.0247 (4) | |
N1 | 0.29249 (12) | 0.3877 (4) | −0.01482 (10) | 0.0245 (4) | |
N2 | 0.27115 (12) | 0.4000 (4) | 0.04901 (10) | 0.0202 (4) | |
N3 | 0.52217 (12) | 0.4076 (4) | 0.22290 (11) | 0.0218 (4) | |
C1 | 0.36847 (14) | 0.6842 (4) | 0.05707 (12) | 0.0215 (5) | |
C2 | 0.35194 (15) | 0.5606 (5) | −0.01018 (12) | 0.0233 (5) | |
C3 | 0.31611 (14) | 0.5796 (4) | 0.09432 (12) | 0.0190 (4) | |
C4 | 0.39090 (17) | 0.6042 (6) | −0.07062 (14) | 0.0352 (6) | |
H4A | 0.3649 | 0.4916 | −0.1110 | 0.053* | |
H4B | 0.4535 | 0.5753 | −0.0531 | 0.053* | |
H4C | 0.3800 | 0.7745 | −0.0876 | 0.053* | |
C5 | 0.20495 (14) | 0.2363 (5) | 0.05891 (12) | 0.0235 (5) | |
H5A | 0.2172 | 0.1966 | 0.1114 | 0.028* | |
H5B | 0.2064 | 0.0809 | 0.0323 | 0.028* | |
C6 | 0.11590 (16) | 0.3492 (5) | 0.03153 (14) | 0.0306 (6) | |
C7 | 0.30517 (14) | 0.6434 (5) | 0.16676 (12) | 0.0203 (4) | |
H7A | 0.2433 | 0.6247 | 0.1641 | 0.024* | |
H7B | 0.3206 | 0.8188 | 0.1770 | 0.024* | |
C8 | 0.47706 (14) | 0.5475 (4) | 0.25141 (12) | 0.0180 (4) | |
C9 | 0.52301 (14) | 0.7679 (5) | 0.29165 (13) | 0.0242 (5) | |
H9A | 0.5152 | 0.7824 | 0.3409 | 0.029* | |
H9B | 0.5041 | 0.9221 | 0.2641 | 0.029* | |
C10 | 0.61659 (14) | 0.6997 (4) | 0.29502 (13) | 0.0221 (5) | |
C11 | 0.66758 (17) | 0.9027 (5) | 0.27253 (17) | 0.0347 (6) | |
H11A | 0.7229 | 0.8370 | 0.2691 | 0.052* | |
H11B | 0.6786 | 1.0347 | 0.3090 | 0.052* | |
H11C | 0.6343 | 0.9682 | 0.2249 | 0.052* | |
C12 | 0.66479 (18) | 0.5845 (5) | 0.36726 (15) | 0.0359 (6) | |
H12A | 0.7202 | 0.5188 | 0.3643 | 0.054* | |
H12B | 0.6300 | 0.4508 | 0.3786 | 0.054* | |
H12C | 0.6754 | 0.7093 | 0.4058 | 0.054* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Br1 | 0.02683 (15) | 0.02743 (17) | 0.03790 (17) | −0.00740 (9) | 0.00979 (11) | 0.00368 (10) |
S1 | 0.0184 (3) | 0.0222 (3) | 0.0175 (3) | −0.00311 (19) | 0.0078 (2) | −0.0020 (2) |
F1 | 0.0246 (8) | 0.0738 (14) | 0.0495 (10) | −0.0205 (8) | 0.0044 (7) | 0.0103 (9) |
F2 | 0.0288 (9) | 0.0612 (13) | 0.0659 (13) | 0.0097 (8) | 0.0074 (8) | −0.0243 (10) |
F3 | 0.0334 (9) | 0.0640 (13) | 0.0331 (9) | 0.0067 (8) | 0.0043 (7) | 0.0170 (8) |
O1 | 0.0277 (9) | 0.0473 (12) | 0.0192 (8) | −0.0046 (8) | 0.0126 (7) | −0.0057 (8) |
O2 | 0.0285 (9) | 0.0204 (9) | 0.0328 (9) | −0.0056 (7) | 0.0065 (7) | 0.0001 (7) |
O3 | 0.0180 (8) | 0.0272 (9) | 0.0307 (9) | −0.0019 (6) | 0.0098 (7) | −0.0084 (7) |
N1 | 0.0237 (10) | 0.0334 (12) | 0.0174 (9) | 0.0014 (8) | 0.0076 (8) | −0.0002 (8) |
N2 | 0.0185 (9) | 0.0257 (10) | 0.0173 (9) | −0.0007 (7) | 0.0065 (7) | −0.0004 (8) |
N3 | 0.0187 (9) | 0.0221 (10) | 0.0251 (10) | −0.0013 (7) | 0.0070 (8) | −0.0031 (8) |
C1 | 0.0183 (10) | 0.0239 (12) | 0.0220 (11) | 0.0001 (8) | 0.0055 (8) | 0.0036 (9) |
C2 | 0.0204 (11) | 0.0320 (14) | 0.0185 (11) | 0.0040 (9) | 0.0072 (9) | 0.0041 (9) |
C3 | 0.0180 (10) | 0.0201 (11) | 0.0187 (10) | 0.0014 (8) | 0.0047 (8) | 0.0009 (8) |
C4 | 0.0289 (13) | 0.0569 (19) | 0.0236 (13) | −0.0009 (12) | 0.0133 (10) | 0.0072 (12) |
C5 | 0.0231 (11) | 0.0254 (12) | 0.0219 (11) | −0.0066 (9) | 0.0066 (9) | 0.0003 (9) |
C6 | 0.0242 (12) | 0.0373 (15) | 0.0295 (13) | −0.0075 (11) | 0.0067 (10) | 0.0009 (11) |
C7 | 0.0190 (10) | 0.0207 (12) | 0.0217 (11) | 0.0008 (8) | 0.0067 (8) | −0.0028 (9) |
C8 | 0.0181 (10) | 0.0189 (11) | 0.0170 (10) | −0.0008 (8) | 0.0049 (8) | −0.0015 (8) |
C9 | 0.0199 (11) | 0.0235 (12) | 0.0298 (12) | −0.0028 (9) | 0.0083 (9) | −0.0064 (10) |
C10 | 0.0208 (11) | 0.0183 (12) | 0.0261 (12) | −0.0002 (8) | 0.0053 (9) | −0.0037 (9) |
C11 | 0.0256 (13) | 0.0256 (14) | 0.0546 (18) | −0.0013 (10) | 0.0141 (12) | 0.0048 (12) |
C12 | 0.0350 (14) | 0.0383 (16) | 0.0277 (14) | 0.0000 (11) | −0.0014 (11) | 0.0005 (11) |
Br1—C1 | 1.868 (2) | C4—H4B | 0.9800 |
S1—O1 | 1.4346 (17) | C4—H4C | 0.9800 |
S1—O2 | 1.4351 (18) | C5—C6 | 1.509 (3) |
S1—C8 | 1.767 (2) | C5—H5A | 0.9900 |
S1—C7 | 1.789 (2) | C5—H5B | 0.9900 |
F1—C6 | 1.327 (3) | C7—H7A | 0.9900 |
F2—C6 | 1.334 (3) | C7—H7B | 0.9900 |
F3—C6 | 1.339 (3) | C8—C9 | 1.499 (3) |
O3—N3 | 1.387 (2) | C9—C10 | 1.537 (3) |
O3—C10 | 1.487 (3) | C9—H9A | 0.9900 |
N1—C2 | 1.327 (3) | C9—H9B | 0.9900 |
N1—N2 | 1.363 (3) | C10—C12 | 1.511 (3) |
N2—C3 | 1.366 (3) | C10—C11 | 1.512 (3) |
N2—C5 | 1.444 (3) | C11—H11A | 0.9800 |
N3—C8 | 1.279 (3) | C11—H11B | 0.9800 |
C1—C3 | 1.376 (3) | C11—H11C | 0.9800 |
C1—C2 | 1.407 (3) | C12—H12A | 0.9800 |
C2—C4 | 1.487 (3) | C12—H12B | 0.9800 |
C3—C7 | 1.488 (3) | C12—H12C | 0.9800 |
C4—H4A | 0.9800 | ||
O1—S1—O2 | 119.28 (11) | F1—C6—C5 | 110.8 (2) |
O1—S1—C8 | 106.41 (11) | F2—C6—C5 | 112.2 (2) |
O2—S1—C8 | 109.30 (10) | F3—C6—C5 | 112.5 (2) |
O1—S1—C7 | 106.71 (11) | C3—C7—S1 | 114.91 (16) |
O2—S1—C7 | 109.08 (11) | C3—C7—H7A | 108.5 |
C8—S1—C7 | 105.17 (11) | S1—C7—H7A | 108.5 |
N3—O3—C10 | 109.76 (16) | C3—C7—H7B | 108.5 |
C2—N1—N2 | 105.69 (19) | S1—C7—H7B | 108.5 |
N1—N2—C3 | 112.23 (19) | H7A—C7—H7B | 107.5 |
N1—N2—C5 | 118.40 (19) | N3—C8—C9 | 115.9 (2) |
C3—N2—C5 | 129.33 (19) | N3—C8—S1 | 117.85 (17) |
C8—N3—O3 | 108.43 (18) | C9—C8—S1 | 126.24 (17) |
C3—C1—C2 | 107.1 (2) | C8—C9—C10 | 99.33 (18) |
C3—C1—Br1 | 125.64 (18) | C8—C9—H9A | 111.9 |
C2—C1—Br1 | 127.23 (18) | C10—C9—H9A | 111.9 |
N1—C2—C1 | 109.9 (2) | C8—C9—H9B | 111.9 |
N1—C2—C4 | 121.4 (2) | C10—C9—H9B | 111.9 |
C1—C2—C4 | 128.7 (2) | H9A—C9—H9B | 109.6 |
N2—C3—C1 | 105.0 (2) | O3—C10—C12 | 106.28 (19) |
N2—C3—C7 | 125.0 (2) | O3—C10—C11 | 106.6 (2) |
C1—C3—C7 | 130.0 (2) | C12—C10—C11 | 112.6 (2) |
C2—C4—H4A | 109.5 | O3—C10—C9 | 103.34 (17) |
C2—C4—H4B | 109.5 | C12—C10—C9 | 112.1 (2) |
H4A—C4—H4B | 109.5 | C11—C10—C9 | 114.9 (2) |
C2—C4—H4C | 109.5 | C10—C11—H11A | 109.5 |
H4A—C4—H4C | 109.5 | C10—C11—H11B | 109.5 |
H4B—C4—H4C | 109.5 | H11A—C11—H11B | 109.5 |
N2—C5—C6 | 111.7 (2) | C10—C11—H11C | 109.5 |
N2—C5—H5A | 109.3 | H11A—C11—H11C | 109.5 |
C6—C5—H5A | 109.3 | H11B—C11—H11C | 109.5 |
N2—C5—H5B | 109.3 | C10—C12—H12A | 109.5 |
C6—C5—H5B | 109.3 | C10—C12—H12B | 109.5 |
H5A—C5—H5B | 107.9 | H12A—C12—H12B | 109.5 |
F1—C6—F2 | 107.2 (2) | C10—C12—H12C | 109.5 |
F1—C6—F3 | 107.2 (2) | H12A—C12—H12C | 109.5 |
F2—C6—F3 | 106.7 (2) | H12B—C12—H12C | 109.5 |
C2—N1—N2—C3 | 0.2 (3) | N2—C3—C7—S1 | 86.0 (2) |
C2—N1—N2—C5 | 178.1 (2) | C1—C3—C7—S1 | −96.3 (3) |
C10—O3—N3—C8 | 10.9 (2) | O1—S1—C7—C3 | −179.38 (16) |
N2—N1—C2—C1 | −0.1 (3) | O2—S1—C7—C3 | −49.28 (19) |
N2—N1—C2—C4 | −179.6 (2) | C8—S1—C7—C3 | 67.86 (19) |
C3—C1—C2—N1 | 0.0 (3) | O3—N3—C8—C9 | 1.1 (3) |
Br1—C1—C2—N1 | −179.51 (17) | O3—N3—C8—S1 | −177.89 (14) |
C3—C1—C2—C4 | 179.4 (2) | O1—S1—C8—N3 | 148.46 (19) |
Br1—C1—C2—C4 | 0.0 (4) | O2—S1—C8—N3 | 18.4 (2) |
N1—N2—C3—C1 | −0.2 (3) | C7—S1—C8—N3 | −98.6 (2) |
C5—N2—C3—C1 | −177.8 (2) | O1—S1—C8—C9 | −30.4 (2) |
N1—N2—C3—C7 | 178.0 (2) | O2—S1—C8—C9 | −160.43 (19) |
C5—N2—C3—C7 | 0.4 (4) | C7—S1—C8—C9 | 82.6 (2) |
C2—C1—C3—N2 | 0.2 (2) | N3—C8—C9—C10 | −11.7 (3) |
Br1—C1—C3—N2 | 179.65 (16) | S1—C8—C9—C10 | 167.21 (17) |
C2—C1—C3—C7 | −177.9 (2) | N3—O3—C10—C12 | 100.6 (2) |
Br1—C1—C3—C7 | 1.6 (4) | N3—O3—C10—C11 | −139.07 (19) |
N1—N2—C5—C6 | −89.7 (2) | N3—O3—C10—C9 | −17.6 (2) |
C3—N2—C5—C6 | 87.8 (3) | C8—C9—C10—O3 | 16.2 (2) |
N2—C5—C6—F1 | 176.9 (2) | C8—C9—C10—C12 | −97.8 (2) |
N2—C5—C6—F2 | −63.4 (3) | C8—C9—C10—C11 | 131.9 (2) |
N2—C5—C6—F3 | 56.9 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7A···F2 | 0.99 | 2.44 | 3.229 (3) | 137 |
C5—H5A···O1i | 0.99 | 2.30 | 3.131 (3) | 141 |
C7—H7B···O2ii | 0.99 | 2.29 | 3.271 (3) | 169 |
Symmetry codes: (i) −x+1/2, y−1/2, −z+1/2; (ii) x, y+1, z. |
Experimental details
Crystal data | |
Chemical formula | C12H15BrF3N3O3S |
Mr | 418.24 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 173 |
a, b, c (Å) | 16.127 (3), 5.4356 (11), 19.135 (4) |
β (°) | 106.85 (3) |
V (Å3) | 1605.3 (6) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 2.74 |
Crystal size (mm) | 0.16 × 0.15 × 0.05 |
Data collection | |
Diffractometer | Rigaku MM007HF + CCD (Saturn724+) |
Absorption correction | Numerical (CrystalClear; Rigaku, 2008) |
Tmin, Tmax | 0.668, 0.875 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 11131, 3614, 3353 |
Rint | 0.040 |
(sin θ/λ)max (Å−1) | 0.649 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.034, 0.093, 1.14 |
No. of reflections | 3614 |
No. of parameters | 211 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.44, −0.50 |
Computer programs: CrystalClear (Rigaku, 2008), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), Mercury (Macrae et al., 2006).
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7A···F2 | 0.99 | 2.44 | 3.229 (3) | 137 |
C5—H5A···O1i | 0.99 | 2.30 | 3.131 (3) | 141 |
C7—H7B···O2ii | 0.99 | 2.29 | 3.271 (3) | 169 |
Symmetry codes: (i) −x+1/2, y−1/2, −z+1/2; (ii) x, y+1, z. |
Acknowledgements
This work was supported by the Major State Basic Research Development Program of China (No. 2010CB126106 and No. 2006CB101907), and the 863 high-tech key project of China (2006AA10A203)
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Pyrazole derivatives represent one of the most important classes of organic heterocyclic compounds, possessing a wide spectrum of biological activities in agrochemicals such as insecticidal (Lahm et al., 2007; Meegalla et al., 2004; Shiga et al., 2003), fungicidal (Aiello et al., 2000; Sivaprasad et al., 2006), herbicidal (Ohno et al., 2004; Vicentini et al., 2005; Waldrep et al., 1990) activities. Some pyrazole derivatives are in use as herbicides such as pyrazolate, pyrazoxyfen, benzofenap, pyraflufen-ethyl, fluazolate and pyrazosulfuron-ethyl (Hirai et al.,2002). The trifluoromethyl moiety is particularly encountered in many biologically active pharmaceutical and agrochemical compounds presumably due to its increased lipophilicity, electronegativity and relatively small size (Welch 1987). Recently, we introduced trifluoromethyl to forming a novel title compound (I) with high herbicidal activity that has not been reported in literatures. The crystal structure of the title compound is shown in Fig. 1.