The title compound, C
16H
18N
2O
2, is a key intermediate for the synthesis of biologically active novel heterocycles,
e.g. isoxazolines and isoxazoles. Geometric parameters of the molecule are in the usual ranges. The crystal packing is stabilized by an O—H
N hydrogen bond.
Supporting information
CCDC reference: 269818
Key indicators
- Single-crystal X-ray study
- T = 173 K
- Mean (C-C) = 0.002 Å
- R factor = 0.049
- wR factor = 0.129
- Data-to-parameter ratio = 15.4
checkCIF/PLATON results
No syntax errors found
Alert level C
PLAT029_ALERT_3_C _diffrn_measured_fraction_theta_full Low ....... 0.97
PLAT220_ALERT_2_C Large Non-Solvent C Ueq(max)/Ueq(min) ... 2.75 Ratio
PLAT222_ALERT_3_C Large Non-Solvent H Ueq(max)/Ueq(min) ... 3.12 Ratio
0 ALERT level A = In general: serious problem
0 ALERT level B = Potentially serious problem
3 ALERT level C = Check and explain
0 ALERT level G = General alerts; check
0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
1 ALERT type 2 Indicator that the structure model may be wrong or deficient
2 ALERT type 3 Indicator that the structure quality may be low
0 ALERT type 4 Improvement, methodology, query or suggestion
Data collection: X-AREA (Stoe & Cie, 2001); cell refinement: X-AREA; data reduction: X-AREA; program(s) used to solve structure: SHELXS97 (Sheldrick, 1990); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: PLATON (Spek, 2003); software used to prepare material for publication: SHELXL97 and PLATON.
4-[2-(5-Ethylpyridin-2-yl)ethoxy]benzaldehyde oxime
top
Crystal data top
C16H18N2O2 | F(000) = 576 |
Mr = 270.32 | Dx = 1.254 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 6268 reflections |
a = 16.4538 (19) Å | θ = 3.7–26.3° |
b = 5.3346 (5) Å | µ = 0.08 mm−1 |
c = 17.952 (2) Å | T = 173 K |
β = 114.709 (9)° | Needle, colourless |
V = 1431.4 (3) Å3 | 0.42 × 0.13 × 0.08 mm |
Z = 4 | |
Data collection top
Stoe IPDS-II two-circle diffractometer | 2222 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.047 |
Graphite monochromator | θmax = 26.4°, θmin = 3.8° |
ω scans | h = −19→20 |
7184 measured reflections | k = −6→6 |
2848 independent reflections | l = −22→14 |
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)] = 0.049 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.129 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0771P)2 + 0.1912P] where P = (Fo2 + 2Fc2)/3 |
2848 reflections | (Δ/σ)max < 0.001 |
185 parameters | Δρmax = 0.31 e Å−3 |
0 restraints | Δρmin = −0.30 e Å−3 |
Special details top
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 (Å2) top | x | y | z | Uiso*/Ueq | |
O1 | 0.20300 (9) | 0.5422 (3) | 0.03269 (8) | 0.0334 (3) | |
N1 | 0.27506 (9) | 0.4887 (3) | 0.10822 (8) | 0.0245 (3) | |
C1 | 0.29326 (11) | 0.6795 (3) | 0.15606 (10) | 0.0216 (3) | |
H1 | 0.2594 | 0.8288 | 0.1369 | 0.026* | |
O2 | 0.56538 (7) | 0.6991 (2) | 0.47903 (7) | 0.0242 (3) | |
C2 | 0.64378 (10) | 0.5454 (3) | 0.50075 (10) | 0.0228 (3) | |
H2A | 0.6688 | 0.5636 | 0.4595 | 0.027* | |
H2B | 0.6287 | 0.3669 | 0.5033 | 0.027* | |
C3 | 0.71147 (11) | 0.6344 (3) | 0.58463 (10) | 0.0255 (4) | |
H3A | 0.7170 | 0.8192 | 0.5846 | 0.031* | |
H3B | 0.6908 | 0.5875 | 0.6272 | 0.031* | |
C4 | 1.04676 (12) | 0.1659 (4) | 0.62787 (12) | 0.0325 (4) | |
H4A | 1.0531 | −0.0013 | 0.6536 | 0.039* | |
H4B | 1.0422 | 0.1412 | 0.5716 | 0.039* | |
C5 | 1.12935 (14) | 0.3188 (5) | 0.67619 (18) | 0.0517 (6) | |
H5A | 1.1822 | 0.2319 | 0.6771 | 0.078* | |
H5B | 1.1353 | 0.3403 | 0.7325 | 0.078* | |
H5C | 1.1242 | 0.4835 | 0.6504 | 0.078* | |
C11 | 0.36498 (10) | 0.6736 (3) | 0.23963 (9) | 0.0188 (3) | |
C12 | 0.42947 (10) | 0.4829 (3) | 0.26693 (10) | 0.0204 (3) | |
H12 | 0.4270 | 0.3504 | 0.2307 | 0.025* | |
C13 | 0.49695 (10) | 0.4844 (3) | 0.34613 (10) | 0.0205 (3) | |
H13 | 0.5403 | 0.3543 | 0.3636 | 0.025* | |
C14 | 0.50073 (10) | 0.6786 (3) | 0.40003 (9) | 0.0188 (3) | |
C15 | 0.43671 (10) | 0.8692 (3) | 0.37439 (10) | 0.0209 (3) | |
H15 | 0.4387 | 0.9999 | 0.4110 | 0.025* | |
C16 | 0.37018 (10) | 0.8663 (3) | 0.29503 (10) | 0.0208 (3) | |
H16 | 0.3272 | 0.9973 | 0.2777 | 0.025* | |
C21 | 0.80133 (10) | 0.5148 (3) | 0.60363 (10) | 0.0221 (3) | |
N22 | 0.84692 (9) | 0.6062 (3) | 0.56209 (9) | 0.0259 (3) | |
C23 | 0.92392 (11) | 0.4945 (3) | 0.57214 (11) | 0.0279 (4) | |
H23 | 0.9555 | 0.5610 | 0.5428 | 0.033* | |
C24 | 0.96104 (11) | 0.2866 (3) | 0.62285 (10) | 0.0256 (4) | |
C25 | 0.91491 (12) | 0.2002 (3) | 0.66732 (11) | 0.0294 (4) | |
H25 | 0.9380 | 0.0638 | 0.7042 | 0.035* | |
C26 | 0.83447 (11) | 0.3140 (3) | 0.65783 (11) | 0.0278 (4) | |
H26 | 0.8027 | 0.2550 | 0.6880 | 0.033* | |
H1O | 0.1897 (19) | 0.382 (6) | 0.007 (2) | 0.065 (8)* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
O1 | 0.0346 (7) | 0.0325 (7) | 0.0197 (6) | 0.0031 (5) | −0.0018 (5) | −0.0029 (5) |
N1 | 0.0234 (7) | 0.0276 (7) | 0.0181 (6) | −0.0024 (5) | 0.0043 (5) | −0.0006 (5) |
C1 | 0.0223 (7) | 0.0220 (7) | 0.0202 (8) | −0.0005 (6) | 0.0088 (6) | 0.0001 (6) |
O2 | 0.0203 (6) | 0.0313 (6) | 0.0174 (6) | 0.0051 (5) | 0.0043 (5) | −0.0054 (4) |
C2 | 0.0194 (7) | 0.0259 (7) | 0.0214 (7) | 0.0041 (6) | 0.0069 (6) | −0.0021 (6) |
C3 | 0.0235 (8) | 0.0312 (8) | 0.0199 (8) | 0.0028 (7) | 0.0071 (6) | −0.0026 (6) |
C4 | 0.0292 (9) | 0.0368 (9) | 0.0317 (9) | 0.0058 (7) | 0.0131 (8) | 0.0009 (7) |
C5 | 0.0275 (10) | 0.0545 (13) | 0.0757 (17) | −0.0001 (9) | 0.0241 (11) | −0.0241 (12) |
C11 | 0.0190 (7) | 0.0213 (7) | 0.0175 (7) | −0.0047 (6) | 0.0090 (6) | −0.0019 (6) |
C12 | 0.0242 (8) | 0.0188 (7) | 0.0210 (7) | −0.0023 (6) | 0.0122 (6) | −0.0043 (6) |
C13 | 0.0211 (7) | 0.0195 (7) | 0.0227 (8) | 0.0022 (6) | 0.0110 (6) | −0.0011 (6) |
C14 | 0.0178 (7) | 0.0229 (7) | 0.0164 (7) | −0.0024 (6) | 0.0078 (6) | −0.0022 (6) |
C15 | 0.0217 (7) | 0.0205 (7) | 0.0214 (7) | −0.0004 (6) | 0.0100 (6) | −0.0046 (6) |
C16 | 0.0197 (7) | 0.0198 (7) | 0.0235 (8) | 0.0014 (6) | 0.0095 (6) | −0.0007 (6) |
C21 | 0.0204 (7) | 0.0258 (8) | 0.0166 (7) | −0.0011 (6) | 0.0044 (6) | −0.0025 (6) |
N22 | 0.0235 (7) | 0.0294 (7) | 0.0223 (7) | 0.0009 (6) | 0.0073 (6) | 0.0036 (6) |
C23 | 0.0251 (8) | 0.0350 (9) | 0.0245 (8) | −0.0003 (7) | 0.0114 (7) | 0.0055 (7) |
C24 | 0.0213 (8) | 0.0302 (8) | 0.0224 (8) | 0.0007 (7) | 0.0063 (6) | −0.0001 (6) |
C25 | 0.0265 (8) | 0.0342 (9) | 0.0249 (8) | 0.0033 (7) | 0.0082 (7) | 0.0098 (7) |
C26 | 0.0243 (8) | 0.0344 (9) | 0.0250 (8) | 0.0007 (7) | 0.0107 (7) | 0.0054 (7) |
Geometric parameters (Å, º) top
O1—N1 | 1.4077 (18) | C11—C12 | 1.402 (2) |
O1—H1O | 0.95 (3) | C11—C16 | 1.408 (2) |
N1—C1 | 1.284 (2) | C12—C13 | 1.391 (2) |
C1—C11 | 1.471 (2) | C12—H12 | 0.9500 |
C1—H1 | 0.9500 | C13—C14 | 1.401 (2) |
O2—C14 | 1.3761 (19) | C13—H13 | 0.9500 |
O2—C2 | 1.4379 (19) | C14—C15 | 1.396 (2) |
C2—C3 | 1.527 (2) | C15—C16 | 1.387 (2) |
C2—H2A | 0.9900 | C15—H15 | 0.9500 |
C2—H2B | 0.9900 | C16—H16 | 0.9500 |
C3—C21 | 1.513 (2) | C21—N22 | 1.351 (2) |
C3—H3A | 0.9900 | C21—C26 | 1.395 (2) |
C3—H3B | 0.9900 | N22—C23 | 1.342 (2) |
C4—C5 | 1.510 (3) | C23—C24 | 1.402 (2) |
C4—C24 | 1.518 (2) | C23—H23 | 0.9500 |
C4—H4A | 0.9900 | C24—C25 | 1.390 (2) |
C4—H4B | 0.9900 | C25—C26 | 1.400 (2) |
C5—H5A | 0.9800 | C25—H25 | 0.9500 |
C5—H5B | 0.9800 | C26—H26 | 0.9500 |
C5—H5C | 0.9800 | | |
| | | |
N1—O1—H1O | 102.5 (18) | C16—C11—C1 | 119.39 (14) |
C1—N1—O1 | 110.52 (13) | C13—C12—C11 | 121.14 (14) |
N1—C1—C11 | 121.91 (14) | C13—C12—H12 | 119.4 |
N1—C1—H1 | 119.0 | C11—C12—H12 | 119.4 |
C11—C1—H1 | 119.0 | C12—C13—C14 | 119.76 (14) |
C14—O2—C2 | 116.97 (12) | C12—C13—H13 | 120.1 |
O2—C2—C3 | 106.99 (13) | C14—C13—H13 | 120.1 |
O2—C2—H2A | 110.3 | O2—C14—C15 | 115.69 (13) |
C3—C2—H2A | 110.3 | O2—C14—C13 | 124.24 (14) |
O2—C2—H2B | 110.3 | C15—C14—C13 | 120.06 (14) |
C3—C2—H2B | 110.3 | C16—C15—C14 | 119.56 (14) |
H2A—C2—H2B | 108.6 | C16—C15—H15 | 120.2 |
C21—C3—C2 | 109.43 (13) | C14—C15—H15 | 120.2 |
C21—C3—H3A | 109.8 | C15—C16—C11 | 121.49 (14) |
C2—C3—H3A | 109.8 | C15—C16—H16 | 119.3 |
C21—C3—H3B | 109.8 | C11—C16—H16 | 119.3 |
C2—C3—H3B | 109.8 | N22—C21—C26 | 121.11 (15) |
H3A—C3—H3B | 108.2 | N22—C21—C3 | 116.06 (14) |
C5—C4—C24 | 113.32 (16) | C26—C21—C3 | 122.77 (16) |
C5—C4—H4A | 108.9 | C23—N22—C21 | 118.44 (14) |
C24—C4—H4A | 108.9 | N22—C23—C24 | 124.67 (17) |
C5—C4—H4B | 108.9 | N22—C23—H23 | 117.7 |
C24—C4—H4B | 108.9 | C24—C23—H23 | 117.7 |
H4A—C4—H4B | 107.7 | C25—C24—C23 | 116.14 (15) |
C4—C5—H5A | 109.5 | C25—C24—C4 | 122.83 (16) |
C4—C5—H5B | 109.5 | C23—C24—C4 | 121.03 (16) |
H5A—C5—H5B | 109.5 | C24—C25—C26 | 120.11 (16) |
C4—C5—H5C | 109.5 | C24—C25—H25 | 119.9 |
H5A—C5—H5C | 109.5 | C26—C25—H25 | 119.9 |
H5B—C5—H5C | 109.5 | C21—C26—C25 | 119.45 (16) |
C12—C11—C16 | 117.98 (14) | C21—C26—H26 | 120.3 |
C12—C11—C1 | 122.63 (14) | C25—C26—H26 | 120.3 |
| | | |
O1—N1—C1—C11 | 179.02 (14) | C1—C11—C16—C15 | −179.84 (14) |
C14—O2—C2—C3 | 170.10 (13) | C2—C3—C21—N22 | 73.96 (18) |
O2—C2—C3—C21 | −169.22 (13) | C2—C3—C21—C26 | −103.16 (19) |
N1—C1—C11—C12 | 13.4 (2) | C26—C21—N22—C23 | 2.0 (2) |
N1—C1—C11—C16 | −166.90 (16) | C3—C21—N22—C23 | −175.17 (14) |
C16—C11—C12—C13 | −0.4 (2) | C21—N22—C23—C24 | 0.3 (3) |
C1—C11—C12—C13 | 179.34 (15) | N22—C23—C24—C25 | −2.5 (3) |
C11—C12—C13—C14 | 0.3 (2) | N22—C23—C24—C4 | 177.54 (16) |
C2—O2—C14—C15 | −164.93 (14) | C5—C4—C24—C25 | −105.9 (2) |
C2—O2—C14—C13 | 14.4 (2) | C5—C4—C24—C23 | 74.1 (2) |
C12—C13—C14—O2 | −179.03 (14) | C23—C24—C25—C26 | 2.3 (3) |
C12—C13—C14—C15 | 0.3 (2) | C4—C24—C25—C26 | −177.72 (17) |
O2—C14—C15—C16 | 178.60 (14) | N22—C21—C26—C25 | −2.1 (3) |
C13—C14—C15—C16 | −0.8 (2) | C3—C21—C26—C25 | 174.90 (16) |
C14—C15—C16—C11 | 0.7 (2) | C24—C25—C26—C21 | −0.2 (3) |
C12—C11—C16—C15 | −0.1 (2) | | |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1O···N22i | 0.95 (3) | 1.86 (3) | 2.7948 (19) | 169 (3) |
Symmetry code: (i) −x+1, y−1/2, −z+1/2. |