Literature DB >> 21587951

(7E)-5-Benzyl-7-(2-chloro-benzyl-idene)-3-(2-chloro-phen-yl)-2-phenyl-3,3a,4,5,6,7-hexa-hydro-2H-pyrazolo-[4,3-c]pyridine.

N S Karthikeyan, B Uma Mahesh, K Sathiyanarayanan, P Raghavaiah, R S Rathore.   

Abstract

In the title 2H-pyrazolo-[4,3-c]pyridine derivative, C(32)H(27)Cl(2)N(3), the dihydro-pyrazole ring adopts an envelope conformation and the piperidine fused ring a twisted-chair conformation. Two short intra-molecular C-H⋯Cl contacts are observed. The crystal packing is characterized by dimeric C-Cl⋯π inter-actions involving the 5-benzyl ring, with Cl⋯centroid and closest atomic Cl⋯π distances of 3.778 (2) and 3.366 (4) Å, respectively.

Entities:  

Year:  2010        PMID: 21587951      PMCID: PMC3006872          DOI: 10.1107/S1600536810023317

Source DB:  PubMed          Journal:  Acta Crystallogr Sect E Struct Rep Online        ISSN: 1600-5368


Related literature

For the anti-inflammatory activity of 2H-pyrazolo­[4,3-c]pyridine derivatives, see Krapcho & Turk (1975 ▶). For π-halogen-dimer inter­actions and their role in host–guest chemistry, see: Noman et al. (2004 ▶); Nagaraj et al. (2005 ▶).

Experimental

Crystal data

C32H27Cl2N3 M = 524.47 Monoclinic, a = 13.7117 (7) Å b = 15.4451 (6) Å c = 13.6896 (9) Å β = 113.135 (7)° V = 2666.0 (2) Å3 Z = 4 Mo Kα radiation μ = 0.27 mm−1 T = 294 K 0.36 × 0.26 × 0.22 mm

Data collection

Oxford Diffraction Xcalibur Eos Gemini diffractometer Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2009 ▶) T min = 0.909, T max = 0.943 11774 measured reflections 5436 independent reflections 2483 reflections with I > 2σ(I) R int = 0.049

Refinement

R[F 2 > 2σ(F 2)] = 0.049 wR(F 2) = 0.098 S = 0.83 5436 reflections 334 parameters H-atom parameters constrained Δρmax = 0.17 e Å−3 Δρmin = −0.23 e Å−3 Data collection: CrysAlis PRO (Oxford Diffraction, 2009 ▶); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: ORTEP-3 (Farrugia, 1997 ▶) and PLATON (Spek, 2009 ▶); software used to prepare material for publication: SHELXL97 and PLATON. Crystal structure: contains datablocks global, I. DOI: 10.1107/S1600536810023317/ng2791sup1.cif Structure factors: contains datablocks I. DOI: 10.1107/S1600536810023317/ng2791Isup2.hkl Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C32H27Cl2N3F(000) = 1096
Mr = 524.47Dx = 1.307 Mg m3
Monoclinic, P21/cMelting point: 427(2) K
Hall symbol: -P 2ybcMo Kα radiation, λ = 0.71073 Å
a = 13.7117 (7) ÅCell parameters from 2998 reflections
b = 15.4451 (6) Åθ = 2.6–29.1°
c = 13.6896 (9) ŵ = 0.27 mm1
β = 113.135 (7)°T = 294 K
V = 2666.0 (2) Å3Plate, colorless
Z = 40.36 × 0.26 × 0.22 mm
Oxford Diffraction Xcalibur Eos Gemini diffractometer5436 independent reflections
Radiation source: Enhance (Mo) X-ray Source2483 reflections with I > 2σ(I)
graphiteRint = 0.049
Detector resolution: 16.3291 pixels mm-1θmax = 26.4°, θmin = 2.6°
ω scanh = −14→17
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2009)k = −19→17
Tmin = 0.909, Tmax = 0.943l = −15→17
11774 measured reflections
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.049Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.098H-atom parameters constrained
S = 0.83w = 1/[σ2(Fo2) + (0.0389P)2] where P = (Fo2 + 2Fc2)/3
5436 reflections(Δ/σ)max < 0.001
334 parametersΔρmax = 0.17 e Å3
0 restraintsΔρmin = −0.23 e Å3
Experimental. CrysAlis PRO, Oxford Diffraction Ltd., Version 1.171.33.55 (release 05–01-2010 CrysAlis171. NET) Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm.
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.
xyzUiso*/Ueq
C30.68994 (17)0.48100 (13)0.39914 (17)0.0384 (6)
H30.73430.43160.39790.046*
C3A0.60177 (16)0.44975 (13)0.43353 (18)0.0372 (6)
H3A0.58470.49580.47350.045*
C40.62227 (17)0.36610 (14)0.49646 (19)0.0466 (7)
H4A0.64890.32250.46230.056*
H4B0.67530.37560.56750.056*
C60.44171 (18)0.31461 (13)0.39584 (19)0.0483 (7)
H6A0.37700.29700.40310.058*
H6B0.46650.26590.36710.058*
C70.41706 (18)0.38915 (13)0.31845 (19)0.0399 (6)
C7A0.51168 (17)0.43857 (14)0.32849 (19)0.0396 (6)
C80.67598 (17)0.52120 (13)0.21565 (19)0.0372 (6)
C90.78552 (18)0.51570 (14)0.24683 (19)0.0440 (6)
H90.82860.50280.31700.053*
C100.8300 (2)0.52943 (15)0.1736 (2)0.0538 (7)
H100.90330.52610.19540.065*
C110.7685 (2)0.54792 (15)0.0691 (2)0.0565 (7)
H110.79920.55610.02020.068*
C120.6598 (2)0.55403 (15)0.0385 (2)0.0563 (7)
H120.61730.5671−0.03170.068*
C130.61374 (19)0.54113 (14)0.1102 (2)0.0491 (7)
H130.54060.54580.08820.059*
C140.75983 (17)0.55254 (13)0.46627 (18)0.0371 (6)
C150.86179 (18)0.53885 (15)0.54037 (19)0.0496 (7)
C160.9251 (2)0.60585 (19)0.5984 (2)0.0626 (8)
H160.99350.59460.64740.075*
C170.8869 (2)0.68811 (19)0.5834 (2)0.0629 (8)
H170.92970.73360.62110.075*
C180.7853 (2)0.70400 (16)0.5126 (2)0.0603 (8)
H180.75840.76010.50380.072*
C190.72281 (19)0.63714 (15)0.4546 (2)0.0494 (7)
H190.65420.64890.40640.059*
C200.5425 (2)0.25732 (14)0.5690 (2)0.0565 (7)
H20A0.57100.21250.53810.068*
H20B0.47570.23660.56880.068*
C210.6183 (2)0.27240 (15)0.6818 (2)0.0503 (7)
C220.7124 (2)0.22752 (18)0.7258 (3)0.0785 (10)
H220.72950.18630.68550.094*
C230.7823 (3)0.2434 (2)0.8303 (4)0.0997 (14)
H230.84600.21320.85940.120*
C240.7569 (3)0.3035 (2)0.8899 (3)0.0999 (14)
H240.80350.31410.95960.120*
C250.6636 (3)0.34798 (18)0.8477 (2)0.0777 (9)
H250.64620.38860.88840.093*
C260.5955 (2)0.33212 (16)0.7442 (2)0.0601 (8)
H260.53220.36280.71560.072*
C270.32178 (17)0.41049 (14)0.2455 (2)0.0456 (6)
H270.32000.46180.20920.055*
C280.21940 (17)0.36564 (15)0.21350 (18)0.0413 (6)
C290.12329 (18)0.41044 (14)0.1697 (2)0.0454 (6)
C300.02629 (18)0.36958 (16)0.1313 (2)0.0552 (7)
H30−0.03590.40170.10190.066*
C310.0221 (2)0.28080 (17)0.1368 (2)0.0593 (8)
H31−0.04290.25240.11130.071*
C320.1142 (2)0.23457 (15)0.1800 (2)0.0570 (8)
H320.11150.17460.18450.068*
C330.21102 (19)0.27578 (15)0.21688 (19)0.0507 (7)
H330.27260.24280.24480.061*
N10.52729 (14)0.47054 (11)0.24903 (16)0.0431 (5)
N20.62818 (14)0.51001 (11)0.28892 (15)0.0403 (5)
N50.52271 (14)0.33591 (11)0.50228 (15)0.0428 (5)
Cl10.91528 (6)0.43491 (4)0.56217 (7)0.0870 (3)
Cl20.12374 (5)0.52302 (4)0.16351 (7)0.0764 (3)
U11U22U33U12U13U23
C30.0318 (12)0.0456 (13)0.0375 (14)0.0018 (11)0.0133 (12)0.0007 (12)
C3A0.0334 (13)0.0410 (14)0.0401 (14)−0.0001 (10)0.0174 (12)−0.0006 (12)
C40.0388 (14)0.0504 (15)0.0494 (16)−0.0005 (11)0.0161 (14)0.0036 (13)
C60.0433 (15)0.0498 (15)0.0512 (17)−0.0036 (12)0.0179 (14)−0.0057 (13)
C70.0361 (14)0.0483 (14)0.0384 (15)−0.0021 (11)0.0179 (13)−0.0016 (12)
C7A0.0332 (14)0.0460 (14)0.0429 (16)0.0006 (11)0.0187 (13)0.0023 (12)
C80.0335 (14)0.0410 (13)0.0380 (14)−0.0044 (11)0.0152 (13)−0.0030 (12)
C90.0394 (15)0.0571 (15)0.0380 (15)0.0010 (12)0.0180 (13)−0.0014 (12)
C100.0424 (15)0.0719 (17)0.0555 (18)−0.0033 (13)0.0281 (16)−0.0068 (15)
C110.0635 (19)0.0644 (17)0.0556 (19)−0.0102 (14)0.0384 (17)−0.0052 (15)
C120.0599 (19)0.0697 (17)0.0403 (16)−0.0072 (14)0.0208 (16)0.0048 (14)
C130.0379 (14)0.0639 (17)0.0440 (16)−0.0046 (12)0.0143 (14)0.0015 (14)
C140.0351 (13)0.0438 (14)0.0352 (14)−0.0031 (11)0.0167 (12)−0.0005 (12)
C150.0405 (14)0.0607 (16)0.0414 (15)−0.0023 (13)0.0095 (14)−0.0021 (13)
C160.0460 (16)0.084 (2)0.0463 (18)−0.0079 (16)0.0063 (15)−0.0097 (16)
C170.063 (2)0.074 (2)0.0553 (19)−0.0245 (16)0.0269 (17)−0.0207 (16)
C180.070 (2)0.0479 (15)0.072 (2)−0.0065 (14)0.0376 (19)−0.0086 (15)
C190.0418 (15)0.0516 (16)0.0548 (17)0.0009 (13)0.0187 (14)−0.0034 (14)
C200.0609 (17)0.0449 (15)0.0643 (19)−0.0002 (13)0.0252 (17)0.0074 (14)
C210.0457 (16)0.0430 (15)0.0597 (19)0.0010 (13)0.0179 (16)0.0206 (15)
C220.063 (2)0.0688 (19)0.102 (3)0.0148 (16)0.031 (2)0.037 (2)
C230.051 (2)0.090 (3)0.130 (4)0.010 (2)0.007 (3)0.064 (3)
C240.073 (3)0.095 (3)0.090 (3)−0.032 (2)−0.013 (2)0.049 (2)
C250.083 (2)0.077 (2)0.057 (2)−0.0231 (18)0.010 (2)0.0085 (18)
C260.0543 (18)0.0576 (17)0.0574 (19)−0.0043 (14)0.0100 (17)0.0125 (16)
C270.0397 (15)0.0499 (14)0.0486 (17)−0.0030 (12)0.0189 (14)0.0001 (13)
C280.0369 (14)0.0516 (15)0.0361 (15)−0.0030 (12)0.0152 (13)−0.0033 (12)
C290.0399 (15)0.0487 (14)0.0493 (16)−0.0047 (12)0.0193 (14)0.0013 (13)
C300.0377 (15)0.0598 (17)0.0600 (19)0.0001 (12)0.0104 (15)0.0037 (15)
C310.0448 (16)0.0624 (18)0.0586 (19)−0.0144 (14)0.0072 (16)−0.0048 (15)
C320.0527 (17)0.0477 (15)0.0564 (18)−0.0077 (13)0.0060 (16)−0.0058 (14)
C330.0448 (16)0.0528 (16)0.0465 (16)−0.0005 (12)0.0093 (14)−0.0077 (13)
N10.0299 (11)0.0542 (12)0.0451 (13)−0.0051 (9)0.0145 (11)−0.0001 (11)
N20.0287 (11)0.0570 (12)0.0350 (12)−0.0049 (9)0.0124 (10)0.0001 (10)
N50.0400 (12)0.0443 (11)0.0434 (12)−0.0051 (9)0.0156 (11)0.0044 (10)
Cl10.0653 (5)0.0766 (5)0.0839 (6)0.0217 (4)−0.0087 (5)0.0038 (4)
Cl20.0549 (4)0.0535 (4)0.1194 (7)0.0007 (3)0.0327 (5)0.0127 (4)
C3—N21.480 (3)C17—C181.372 (3)
C3—C141.514 (3)C17—H170.9300
C3—C3A1.537 (3)C18—C191.377 (3)
C3—H30.9800C18—H180.9300
C3A—C7A1.493 (3)C19—H190.9300
C3A—C41.517 (3)C20—N51.478 (3)
C3A—H3A0.9800C20—C211.503 (3)
C4—N51.474 (3)C20—H20A0.9700
C4—H4A0.9700C20—H20B0.9700
C4—H4B0.9700C21—C261.373 (3)
C6—N51.481 (3)C21—C221.377 (3)
C6—C71.510 (3)C22—C231.397 (4)
C6—H6A0.9700C22—H220.9300
C6—H6B0.9700C23—C241.368 (5)
C7—C271.337 (3)C23—H230.9300
C7—C7A1.464 (3)C24—C251.364 (4)
C7A—N11.287 (3)C24—H240.9300
C8—C131.392 (3)C25—C261.379 (3)
C8—C91.393 (3)C25—H250.9300
C8—N21.408 (3)C26—H260.9300
C9—C101.379 (3)C27—C281.470 (3)
C9—H90.9300C27—H270.9300
C10—C111.375 (3)C28—C331.395 (3)
C10—H100.9300C28—C291.398 (3)
C11—C121.383 (3)C29—C301.376 (3)
C11—H110.9300C29—Cl21.741 (2)
C12—C131.375 (3)C30—C311.376 (3)
C12—H120.9300C30—H300.9300
C13—H130.9300C31—C321.367 (3)
C14—C151.383 (3)C31—H310.9300
C14—C191.388 (3)C32—C331.376 (3)
C15—C161.383 (3)C32—H320.9300
C15—Cl11.741 (2)C33—H330.9300
C16—C171.359 (3)N1—N21.411 (2)
C16—H160.9300
N2—C3—C14111.73 (17)C18—C17—H17120.1
N2—C3—C3A101.74 (17)C17—C18—C19120.2 (2)
C14—C3—C3A115.45 (19)C17—C18—H18119.9
N2—C3—H3109.2C19—C18—H18119.9
C14—C3—H3109.2C18—C19—C14121.5 (2)
C3A—C3—H3109.2C18—C19—H19119.2
C7A—C3A—C4110.32 (17)C14—C19—H19119.2
C7A—C3A—C3101.19 (18)N5—C20—C21113.11 (18)
C4—C3A—C3116.68 (18)N5—C20—H20A109.0
C7A—C3A—H3A109.4C21—C20—H20A109.0
C4—C3A—H3A109.4N5—C20—H20B109.0
C3—C3A—H3A109.4C21—C20—H20B109.0
N5—C4—C3A109.35 (17)H20A—C20—H20B107.8
N5—C4—H4A109.8C26—C21—C22118.0 (3)
C3A—C4—H4A109.8C26—C21—C20120.6 (2)
N5—C4—H4B109.8C22—C21—C20121.5 (3)
C3A—C4—H4B109.8C21—C22—C23120.5 (3)
H4A—C4—H4B108.3C21—C22—H22119.8
N5—C6—C7113.30 (17)C23—C22—H22119.8
N5—C6—H6A108.9C24—C23—C22119.8 (3)
C7—C6—H6A108.9C24—C23—H23120.1
N5—C6—H6B108.9C22—C23—H23120.1
C7—C6—H6B108.9C25—C24—C23120.3 (3)
H6A—C6—H6B107.7C25—C24—H24119.8
C27—C7—C7A120.7 (2)C23—C24—H24119.8
C27—C7—C6126.6 (2)C24—C25—C26119.3 (3)
C7A—C7—C6112.69 (19)C24—C25—H25120.4
N1—C7A—C7123.8 (2)C26—C25—H25120.4
N1—C7A—C3A114.9 (2)C21—C26—C25122.1 (3)
C7—C7A—C3A121.2 (2)C21—C26—H26119.0
C13—C8—C9118.6 (2)C25—C26—H26119.0
C13—C8—N2119.9 (2)C7—C27—C28130.2 (2)
C9—C8—N2121.5 (2)C7—C27—H27114.9
C10—C9—C8120.0 (2)C28—C27—H27114.9
C10—C9—H9120.0C33—C28—C29115.5 (2)
C8—C9—H9120.0C33—C28—C27122.7 (2)
C11—C10—C9121.4 (2)C29—C28—C27121.6 (2)
C11—C10—H10119.3C30—C29—C28122.9 (2)
C9—C10—H10119.3C30—C29—Cl2117.43 (18)
C10—C11—C12118.5 (3)C28—C29—Cl2119.63 (17)
C10—C11—H11120.7C31—C30—C29119.4 (2)
C12—C11—H11120.7C31—C30—H30120.3
C13—C12—C11121.1 (3)C29—C30—H30120.3
C13—C12—H12119.5C32—C31—C30119.6 (2)
C11—C12—H12119.5C32—C31—H31120.2
C12—C13—C8120.4 (2)C30—C31—H31120.2
C12—C13—H13119.8C31—C32—C33120.7 (2)
C8—C13—H13119.8C31—C32—H32119.6
C15—C14—C19116.5 (2)C33—C32—H32119.6
C15—C14—C3123.4 (2)C32—C33—C28121.9 (2)
C19—C14—C3120.10 (19)C32—C33—H33119.1
C16—C15—C14122.2 (2)C28—C33—H33119.1
C16—C15—Cl1117.7 (2)C7A—N1—N2107.59 (19)
C14—C15—Cl1120.18 (18)C8—N2—N1115.95 (18)
C17—C16—C15119.7 (2)C8—N2—C3121.56 (17)
C17—C16—H16120.2N1—N2—C3110.18 (17)
C15—C16—H16120.2C4—N5—C20110.11 (18)
C16—C17—C18119.9 (2)C4—N5—C6111.69 (18)
C16—C17—H17120.1C20—N5—C6108.06 (17)
N2—C3—C3A—C7A18.3 (2)C26—C21—C22—C23−0.6 (4)
C14—C3—C3A—C7A139.43 (18)C20—C21—C22—C23179.1 (2)
N2—C3—C3A—C4137.96 (19)C21—C22—C23—C240.5 (5)
C14—C3—C3A—C4−100.9 (2)C22—C23—C24—C250.0 (5)
C7A—C3A—C4—N5−52.9 (2)C23—C24—C25—C26−0.4 (5)
C3—C3A—C4—N5−167.63 (18)C22—C21—C26—C250.2 (4)
N5—C6—C7—C27−141.8 (2)C20—C21—C26—C25−179.5 (2)
N5—C6—C7—C7A39.4 (3)C24—C25—C26—C210.3 (4)
C27—C7—C7A—N1−36.8 (3)C7A—C7—C27—C28172.6 (2)
C6—C7—C7A—N1142.1 (2)C6—C7—C27—C28−6.1 (4)
C27—C7—C7A—C3A147.8 (2)C7—C27—C28—C33−31.2 (4)
C6—C7—C7A—C3A−33.3 (3)C7—C27—C28—C29153.8 (3)
C4—C3A—C7A—N1−135.4 (2)C33—C28—C29—C30−0.6 (4)
C3—C3A—C7A—N1−11.3 (2)C27—C28—C29—C30174.7 (2)
C4—C3A—C7A—C740.4 (3)C33—C28—C29—Cl2178.85 (18)
C3—C3A—C7A—C7164.53 (19)C27—C28—C29—Cl2−5.9 (3)
C13—C8—C9—C10−0.4 (3)C28—C29—C30—C310.9 (4)
N2—C8—C9—C10−178.2 (2)Cl2—C29—C30—C31−178.6 (2)
C8—C9—C10—C11−0.6 (4)C29—C30—C31—C32−0.2 (4)
C9—C10—C11—C121.1 (4)C30—C31—C32—C33−0.8 (4)
C10—C11—C12—C13−0.6 (4)C31—C32—C33—C281.1 (4)
C11—C12—C13—C8−0.3 (4)C29—C28—C33—C32−0.4 (4)
C9—C8—C13—C120.8 (3)C27—C28—C33—C32−175.6 (2)
N2—C8—C13—C12178.6 (2)C7—C7A—N1—N2−177.40 (19)
N2—C3—C14—C15−140.5 (2)C3A—C7A—N1—N2−1.7 (3)
C3A—C3—C14—C15103.9 (3)C13—C8—N2—N135.8 (3)
N2—C3—C14—C1939.0 (3)C9—C8—N2—N1−146.42 (19)
C3A—C3—C14—C19−76.6 (3)C13—C8—N2—C3174.33 (19)
C19—C14—C15—C16−1.5 (4)C9—C8—N2—C3−7.9 (3)
C3—C14—C15—C16178.0 (2)C7A—N1—N2—C8158.2 (2)
C19—C14—C15—Cl1179.33 (19)C7A—N1—N2—C315.1 (2)
C3—C14—C15—Cl1−1.2 (3)C14—C3—N2—C874.5 (2)
C14—C15—C16—C170.3 (4)C3A—C3—N2—C8−161.78 (18)
Cl1—C15—C16—C17179.5 (2)C14—C3—N2—N1−144.89 (18)
C15—C16—C17—C181.3 (4)C3A—C3—N2—N1−21.2 (2)
C16—C17—C18—C19−1.8 (4)C3A—C4—N5—C20−176.51 (18)
C17—C18—C19—C140.6 (4)C3A—C4—N5—C663.4 (2)
C15—C14—C19—C181.1 (4)C21—C20—N5—C461.7 (3)
C3—C14—C19—C18−178.5 (2)C21—C20—N5—C6−176.1 (2)
N5—C20—C21—C2659.8 (3)C7—C6—N5—C4−56.7 (2)
N5—C20—C21—C22−119.9 (2)C7—C6—N5—C20−178.0 (2)
D—H···AD—HH···AD···AD—H···A
C3—H3···Cl10.982.613.101 (2)111
C27—H27···Cl20.932.683.043 (3)104
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯AD—HH⋯ADAD—H⋯A
C3—H3⋯Cl10.982.613.101 (2)111
C27—H27⋯Cl20.932.683.043 (3)104
  4 in total

1.  A short history of SHELX.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A       Date:  2007-12-21       Impact factor: 2.290

2.  C-halogen...pi dimer and C-H...pi interactions in 1-(2-bromo-4,5-dimethoxybenzyl)-2-butyl-4-chloro-1H-imidazole-5-carbaldehyde and 2-butyl-4-chloro-1-(6-methyl-1,3-benzodioxol-5-ylmethyl)-1H-imidazole-5-carbaldehyde.

Authors:  B Nagaraj; T Narasimhamurthy; H S Yathirajan; P Nagaraja; R S Narasegowda; Ravindranath S Rathore
Journal:  Acta Crystallogr C       Date:  2005-02-28       Impact factor: 1.172

3.  Pi-halogen dimer interactions and the inclusion chemistry of a new tetrahalo aryl host.

Authors:  A Noman M M Rahman; Roger Bishop; Donald C Craig; Marcia L Scudder
Journal:  Org Biomol Chem       Date:  2003-11-21       Impact factor: 3.876

4.  Structure validation in chemical crystallography.

Authors:  Anthony L Spek
Journal:  Acta Crystallogr D Biol Crystallogr       Date:  2009-01-20
  4 in total

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