Literature DB >> 25161598

2-Bromo-5-tert-butyl-N-methyl-N-[2-(methyl-amino)-phen-yl]-3-(1-methyl-1H-benzimidazol-2-yl)benzamide.

Poonam Rajesh Prasad1, Shikha Das1, Harkesh B Singh1, Ray J Butcher2.   

Abstract

In the title compound, C27H29BrN4O, benzimidazole ring system and the amide moiety are planar [r.m.s. deviations = 0.016 (2) and 0.017 (1) Å, respectively]. The mol-ecule adopts a conformation in which the amide linkage is almost perpendicular to the central ring [dihedral angle = 85.79 (8)°], while the benzimidazole ring system makes a dihedral angle of 70.26 (11)° with the central ring. In the crystal, the mol-ecules form dimers through N-H⋯O hydrogen bonds and C-H⋯O interactions. These dimers are further linked into zigzag ribbons along [201] by weak C-H⋯Br inter-actions. As a result of the bulky nature of the mol-ecule, as evidenced by the large dihedral angles between rings, there is little evidence for any π-π inter-actions.

Entities:  

Keywords:  crystal structure

Year:  2014        PMID: 25161598      PMCID: PMC4120529          DOI: 10.1107/S1600536814014433

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


Related literature

The metal binding properties of imidazole-containing pincer ligands can be modified by the type of donor atoms and the electron-withdrawing and electron-releasing character of their substituents, see: Selander & Szabó (2011 ▶). For the effect of N-substitution on the catalytic activity of phosphinoimidazolines in palladium-catalysed Heck reactions, see: Busacca et al. (2003 ▶). For the use of bromine-substituted benzimidazole in Heck reactions, see: Reddy & Krishna (2005 ▶). For standard bond lengths, see: Allen et al. (1987 ▶). For the preparation of the precursor, 2-bromo-5-(tert-but­yl)isophthalic acid, see: Field et al. (2003 ▶).

Experimental

Crystal data

C27H29BrN4O M = 505.45 Monoclinic, a = 34.4327 (13) Å b = 9.4152 (2) Å c = 17.1092 (7) Å β = 118.312 (5)° V = 4883.2 (3) Å3 Z = 8 Cu Kα radiation μ = 2.50 mm−1 T = 123 K 0.38 × 0.32 × 0.23 mm

Data collection

Agilent Xcalibur Ruby Gemini diffractometer Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2012 ▶) T min = 0.788, T max = 1.000 9307 measured reflections 4929 independent reflections 4100 reflections with I > 2σ(I) R int = 0.028

Refinement

R[F 2 > 2σ(F 2)] = 0.034 wR(F 2) = 0.093 S = 1.03 4929 reflections 308 parameters H atoms treated by a mixture of independent and constrained refinement Δρmax = 0.43 e Å−3 Δρmin = −0.35 e Å−3 Data collection: CrysAlis PRO (Agilent, 2012 ▶); 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: SHELXTL (Sheldrick, 2008 ▶); software used to prepare material for publication: SHELXTL. Crystal structure: contains datablock(s) I. DOI: 10.1107/S1600536814014433/jj2190sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536814014433/jj2190Isup2.hkl Click here for additional data file. Supporting information file. DOI: 10.1107/S1600536814014433/jj2190Isup3.cml CCDC reference: 1009070 Additional supporting information: crystallographic information; 3D view; checkCIF report
C27H29BrN4OF(000) = 2096
Mr = 505.45Dx = 1.375 Mg m3
Monoclinic, C2/cCu Kα radiation, λ = 1.54184 Å
Hall symbol: -C 2ycCell parameters from 4036 reflections
a = 34.4327 (13) Åθ = 2.9–75.5°
b = 9.4152 (2) ŵ = 2.50 mm1
c = 17.1092 (7) ÅT = 123 K
β = 118.312 (5)°Prism, colorless
V = 4883.2 (3) Å30.38 × 0.32 × 0.23 mm
Z = 8
Agilent Xcalibur Ruby Gemini diffractometer4929 independent reflections
Radiation source: Enhance (Cu) X-ray Source4100 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.028
Detector resolution: 10.5081 pixels mm-1θmax = 75.6°, θmin = 2.9°
ω scansh = −42→42
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2012)k = −8→11
Tmin = 0.788, Tmax = 1.000l = −20→21
9307 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)] = 0.034Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.093H atoms treated by a mixture of independent and constrained refinement
S = 1.03w = 1/[σ2(Fo2) + (0.0514P)2 + 0.4711P] where P = (Fo2 + 2Fc2)/3
4929 reflections(Δ/σ)max = 0.004
308 parametersΔρmax = 0.43 e Å3
0 restraintsΔρmin = −0.35 e Å3
Experimental. 1H NMR (400 MHz, CDCl3): δ (ppm) 7.87-7.71 (1H, m), 7.46-7.31 (4H, m), 7.09-7.07 (1H, m), 6.54-6.48 (1H, m), 3.53 (2H, s), 3.45 (2H, s), 2.89 (2H, s), 1.38 (1H, s), 1.13 (6H, s). 13C NMR (CDCl3): δ 29.4, 30.9, 31.1, 31.9, 31.2, 34.7, 35.1, 35.5, 53.9, 109.7, 109.9, 120.2, 122.1, 122.5, 122.7, 123.1, 123.3, 129.4, 129.7, 131.2, 133.0, 135.6, 142.8, 151.7, 152.6, 152.8.
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
Br0.630352 (8)0.53882 (3)0.543344 (15)0.03435 (9)
O10.52147 (5)0.66100 (17)0.36987 (11)0.0338 (3)
N10.70366 (6)0.3018 (2)0.53797 (13)0.0370 (4)
N20.65609 (7)0.1320 (2)0.53017 (14)0.0380 (4)
N30.56938 (7)0.7887 (2)0.19074 (15)0.0406 (5)
H3B0.5490 (9)0.765 (3)0.1989 (18)0.033 (7)*
N40.57538 (6)0.78517 (19)0.36118 (13)0.0315 (4)
C10.72063 (8)0.4328 (3)0.52039 (19)0.0447 (6)
H1A0.69980.46840.46140.067*
H1B0.74920.41420.52270.067*
H1C0.72440.50390.56530.067*
C20.72791 (8)0.2049 (3)0.60366 (16)0.0401 (5)
C30.77297 (9)0.1991 (4)0.66449 (19)0.0541 (7)
H3A0.79290.27170.66820.065*
C40.78664 (11)0.0803 (4)0.7190 (2)0.0620 (9)
H4A0.81710.06970.76000.074*
C50.75708 (12)−0.0240 (4)0.7155 (2)0.0615 (8)
H5A0.7679−0.10200.75540.074*
C60.71279 (11)−0.0174 (3)0.6561 (2)0.0542 (7)
H6A0.6929−0.08920.65410.065*
C70.69805 (8)0.1004 (3)0.59819 (16)0.0402 (5)
C80.66112 (7)0.2518 (2)0.49703 (15)0.0323 (4)
C90.62557 (7)0.3270 (2)0.42009 (14)0.0292 (4)
C100.60873 (7)0.2663 (2)0.33589 (15)0.0300 (4)
H10A0.61980.17690.32970.036*
C110.57614 (7)0.3331 (2)0.26044 (14)0.0292 (4)
C120.55997 (7)0.4627 (2)0.27251 (15)0.0294 (4)
H12A0.53710.50860.22240.035*
C130.57612 (6)0.5266 (2)0.35517 (14)0.0264 (4)
C140.60895 (7)0.4577 (2)0.42851 (14)0.0276 (4)
C150.55815 (8)0.2676 (2)0.16780 (16)0.0358 (5)
C160.59482 (11)0.1859 (3)0.15917 (19)0.0543 (7)
H16A0.60420.10430.19960.081*
H16B0.62000.24900.17440.081*
H16C0.58350.15240.09800.081*
C170.52108 (12)0.1646 (4)0.1534 (2)0.0693 (11)
H17A0.49780.21570.15920.104*
H17B0.53280.08880.19790.104*
H17C0.50890.12320.09380.104*
C180.54015 (8)0.3820 (3)0.09601 (15)0.0363 (5)
H18A0.51310.42230.09250.054*
H18B0.53360.34000.03870.054*
H18C0.56220.45730.11080.054*
C190.55554 (7)0.6638 (2)0.36324 (13)0.0275 (4)
C200.55836 (9)0.9201 (2)0.3754 (2)0.0426 (6)
H20A0.53620.90110.39470.064*
H20B0.54480.97430.31990.064*
H20C0.58270.97510.42120.064*
C210.61458 (7)0.7918 (2)0.35017 (17)0.0326 (5)
C220.65527 (8)0.8083 (3)0.42439 (18)0.0414 (5)
H22A0.65740.80920.48180.050*
C230.69305 (8)0.8234 (3)0.4155 (2)0.0511 (7)
H23A0.72110.83360.46640.061*
C240.68929 (8)0.8235 (3)0.3315 (2)0.0507 (7)
H24A0.71510.83330.32510.061*
C250.64900 (8)0.8098 (3)0.2569 (2)0.0435 (6)
H25A0.64740.81010.20000.052*
C260.60991 (7)0.7951 (2)0.26395 (17)0.0346 (5)
C270.56379 (9)0.7866 (3)0.10141 (18)0.0464 (6)
H27A0.53230.77940.05880.070*
H27B0.57950.70470.09450.070*
H27C0.57580.87430.09050.070*
U11U22U33U12U13U23
Br0.03690 (13)0.03680 (13)0.02700 (13)0.00268 (9)0.01323 (10)−0.00251 (9)
O10.0297 (7)0.0358 (8)0.0387 (8)−0.0016 (6)0.0186 (7)−0.0021 (7)
N10.0310 (9)0.0397 (10)0.0355 (10)0.0022 (8)0.0118 (8)0.0008 (9)
N20.0409 (10)0.0310 (9)0.0377 (10)0.0037 (8)0.0151 (9)0.0023 (8)
N30.0332 (10)0.0481 (12)0.0406 (11)−0.0087 (9)0.0175 (9)−0.0048 (9)
N40.0269 (9)0.0257 (8)0.0416 (10)0.0007 (7)0.0159 (8)−0.0004 (8)
C10.0359 (12)0.0481 (14)0.0495 (15)−0.0062 (11)0.0196 (12)−0.0017 (12)
C20.0389 (12)0.0445 (13)0.0324 (12)0.0115 (10)0.0132 (10)0.0003 (10)
C30.0398 (14)0.072 (2)0.0381 (14)0.0112 (13)0.0085 (12)−0.0019 (14)
C40.0498 (16)0.083 (2)0.0357 (14)0.0283 (16)0.0059 (13)0.0053 (15)
C50.071 (2)0.0625 (19)0.0414 (15)0.0313 (17)0.0189 (15)0.0140 (14)
C60.0675 (19)0.0453 (15)0.0460 (15)0.0195 (14)0.0237 (15)0.0108 (12)
C70.0439 (13)0.0377 (12)0.0349 (12)0.0119 (10)0.0153 (11)0.0026 (10)
C80.0334 (11)0.0304 (10)0.0312 (11)0.0043 (9)0.0138 (9)−0.0007 (9)
C90.0270 (10)0.0282 (10)0.0307 (11)−0.0011 (8)0.0124 (9)0.0003 (8)
C100.0302 (10)0.0243 (9)0.0355 (11)−0.0010 (8)0.0155 (9)−0.0012 (8)
C110.0321 (10)0.0241 (9)0.0313 (11)−0.0072 (8)0.0150 (9)−0.0027 (8)
C120.0292 (10)0.0267 (10)0.0294 (10)−0.0019 (8)0.0115 (9)0.0023 (8)
C130.0246 (9)0.0239 (9)0.0302 (10)−0.0031 (8)0.0125 (8)−0.0007 (8)
C140.0279 (10)0.0289 (10)0.0249 (10)−0.0031 (8)0.0117 (8)−0.0022 (8)
C150.0483 (13)0.0268 (10)0.0300 (11)−0.0073 (10)0.0167 (10)−0.0028 (9)
C160.082 (2)0.0392 (13)0.0388 (14)0.0177 (14)0.0262 (15)0.0001 (11)
C170.089 (2)0.071 (2)0.0360 (14)−0.053 (2)0.0204 (16)−0.0103 (14)
C180.0436 (12)0.0350 (11)0.0307 (11)0.0006 (10)0.0179 (10)−0.0003 (9)
C190.0249 (9)0.0289 (10)0.0242 (10)0.0005 (8)0.0080 (8)−0.0015 (8)
C200.0406 (12)0.0276 (11)0.0617 (16)0.0050 (10)0.0261 (12)0.0003 (11)
C210.0271 (10)0.0223 (9)0.0484 (13)−0.0001 (8)0.0179 (10)0.0013 (9)
C220.0332 (12)0.0383 (12)0.0450 (14)−0.0049 (10)0.0123 (11)0.0063 (11)
C230.0282 (12)0.0508 (15)0.0623 (18)−0.0053 (11)0.0116 (12)0.0077 (13)
C240.0316 (12)0.0470 (14)0.077 (2)−0.0034 (11)0.0282 (13)0.0031 (14)
C250.0407 (13)0.0375 (12)0.0617 (16)−0.0055 (10)0.0320 (13)−0.0044 (12)
C260.0310 (11)0.0244 (9)0.0477 (13)−0.0018 (8)0.0182 (10)−0.0021 (9)
C270.0515 (15)0.0427 (13)0.0443 (14)−0.0125 (12)0.0221 (12)−0.0076 (11)
Br—C141.901 (2)C12—C131.388 (3)
O1—C191.232 (3)C12—H12A0.9500
N1—C81.373 (3)C13—C141.389 (3)
N1—C21.379 (3)C13—C191.510 (3)
N1—C11.456 (3)C15—C181.526 (3)
N2—C81.310 (3)C15—C171.527 (3)
N2—C71.391 (3)C15—C161.545 (4)
N3—C261.365 (3)C16—H16A0.9800
N3—C271.447 (3)C16—H16B0.9800
N3—H3B0.81 (3)C16—H16C0.9800
N4—C191.340 (3)C17—H17A0.9800
N4—C211.450 (3)C17—H17B0.9800
N4—C201.467 (3)C17—H17C0.9800
C1—H1A0.9800C18—H18A0.9800
C1—H1B0.9800C18—H18B0.9800
C1—H1C0.9800C18—H18C0.9800
C2—C71.394 (4)C20—H20A0.9800
C2—C31.401 (4)C20—H20B0.9800
C3—C41.388 (5)C20—H20C0.9800
C3—H3A0.9500C21—C221.383 (3)
C4—C51.395 (5)C21—C261.406 (3)
C4—H4A0.9500C22—C231.387 (3)
C5—C61.376 (5)C22—H22A0.9500
C5—H5A0.9500C23—C241.379 (4)
C6—C71.412 (4)C23—H23A0.9500
C6—H6A0.9500C24—C251.375 (4)
C8—C91.484 (3)C24—H24A0.9500
C9—C141.393 (3)C25—C261.414 (3)
C9—C101.395 (3)C25—H25A0.9500
C10—C111.395 (3)C27—H27A0.9800
C10—H10A0.9500C27—H27B0.9800
C11—C121.396 (3)C27—H27C0.9800
C11—C151.531 (3)
C8—N1—C2106.0 (2)C18—C15—C11111.07 (18)
C8—N1—C1128.4 (2)C17—C15—C11108.6 (2)
C2—N1—C1125.5 (2)C18—C15—C16108.3 (2)
C8—N2—C7104.4 (2)C17—C15—C16109.0 (3)
C26—N3—C27122.4 (2)C11—C15—C16110.6 (2)
C26—N3—H3B117 (2)C15—C16—H16A109.5
C27—N3—H3B119 (2)C15—C16—H16B109.5
C19—N4—C21123.86 (18)H16A—C16—H16B109.5
C19—N4—C20119.04 (18)C15—C16—H16C109.5
C21—N4—C20117.02 (18)H16A—C16—H16C109.5
N1—C1—H1A109.5H16B—C16—H16C109.5
N1—C1—H1B109.5C15—C17—H17A109.5
H1A—C1—H1B109.5C15—C17—H17B109.5
N1—C1—H1C109.5H17A—C17—H17B109.5
H1A—C1—H1C109.5C15—C17—H17C109.5
H1B—C1—H1C109.5H17A—C17—H17C109.5
N1—C2—C7105.7 (2)H17B—C17—H17C109.5
N1—C2—C3131.4 (3)C15—C18—H18A109.5
C7—C2—C3123.0 (3)C15—C18—H18B109.5
C4—C3—C2115.7 (3)H18A—C18—H18B109.5
C4—C3—H3A122.1C15—C18—H18C109.5
C2—C3—H3A122.1H18A—C18—H18C109.5
C3—C4—C5122.0 (3)H18B—C18—H18C109.5
C3—C4—H4A119.0O1—C19—N4122.7 (2)
C5—C4—H4A119.0O1—C19—C13119.92 (19)
C6—C5—C4122.0 (3)N4—C19—C13117.37 (17)
C6—C5—H5A119.0N4—C20—H20A109.5
C4—C5—H5A119.0N4—C20—H20B109.5
C5—C6—C7117.2 (3)H20A—C20—H20B109.5
C5—C6—H6A121.4N4—C20—H20C109.5
C7—C6—H6A121.4H20A—C20—H20C109.5
N2—C7—C2110.2 (2)H20B—C20—H20C109.5
N2—C7—C6129.8 (3)C22—C21—C26121.5 (2)
C2—C7—C6120.0 (3)C22—C21—N4119.1 (2)
N2—C8—N1113.7 (2)C26—C21—N4119.1 (2)
N2—C8—C9124.9 (2)C21—C22—C23120.3 (3)
N1—C8—C9121.4 (2)C21—C22—H22A119.8
C14—C9—C10118.6 (2)C23—C22—H22A119.8
C14—C9—C8122.40 (19)C24—C23—C22119.0 (3)
C10—C9—C8119.00 (19)C24—C23—H23A120.5
C9—C10—C11121.9 (2)C22—C23—H23A120.5
C9—C10—H10A119.0C25—C24—C23121.4 (2)
C11—C10—H10A119.0C25—C24—H24A119.3
C10—C11—C12117.3 (2)C23—C24—H24A119.3
C10—C11—C15121.96 (19)C24—C25—C26120.8 (3)
C12—C11—C15120.7 (2)C24—C25—H25A119.6
C13—C12—C11122.3 (2)C26—C25—H25A119.6
C13—C12—H12A118.8N3—C26—C21121.4 (2)
C11—C12—H12A118.8N3—C26—C25121.8 (2)
C12—C13—C14118.62 (19)C21—C26—C25116.8 (2)
C12—C13—C19119.05 (19)N3—C27—H27A109.5
C14—C13—C19122.21 (19)N3—C27—H27B109.5
C13—C14—C9121.17 (19)H27A—C27—H27B109.5
C13—C14—Br119.78 (16)N3—C27—H27C109.5
C9—C14—Br119.01 (16)H27A—C27—H27C109.5
C18—C15—C17109.2 (2)H27B—C27—H27C109.5
C8—N1—C2—C70.1 (2)C12—C13—C14—Br−177.74 (14)
C1—N1—C2—C7177.6 (2)C19—C13—C14—Br−1.6 (3)
C8—N1—C2—C3178.1 (3)C10—C9—C14—C130.4 (3)
C1—N1—C2—C3−4.3 (4)C8—C9—C14—C13179.08 (19)
N1—C2—C3—C4−176.7 (3)C10—C9—C14—Br178.12 (15)
C7—C2—C3—C41.0 (4)C8—C9—C14—Br−3.2 (3)
C2—C3—C4—C5−2.2 (4)C10—C11—C15—C18−154.3 (2)
C3—C4—C5—C61.9 (5)C12—C11—C15—C1826.3 (3)
C4—C5—C6—C7−0.2 (5)C10—C11—C15—C1785.6 (3)
C8—N2—C7—C2−0.3 (3)C12—C11—C15—C17−93.8 (3)
C8—N2—C7—C6−178.8 (3)C10—C11—C15—C16−34.1 (3)
N1—C2—C7—N20.1 (3)C12—C11—C15—C16146.5 (2)
C3—C2—C7—N2−178.1 (2)C21—N4—C19—O1−177.7 (2)
N1—C2—C7—C6178.7 (2)C20—N4—C19—O15.7 (3)
C3—C2—C7—C60.5 (4)C21—N4—C19—C131.1 (3)
C5—C6—C7—N2177.4 (3)C20—N4—C19—C13−175.5 (2)
C5—C6—C7—C2−0.9 (4)C12—C13—C19—O182.7 (3)
C7—N2—C8—N10.4 (3)C14—C13—C19—O1−93.4 (2)
C7—N2—C8—C9177.9 (2)C12—C13—C19—N4−96.1 (2)
C2—N1—C8—N2−0.3 (3)C14—C13—C19—N487.7 (2)
C1—N1—C8—N2−177.8 (2)C19—N4—C21—C22−98.6 (3)
C2—N1—C8—C9−177.9 (2)C20—N4—C21—C2278.2 (3)
C1—N1—C8—C94.6 (4)C19—N4—C21—C2687.6 (3)
N2—C8—C9—C14112.4 (3)C20—N4—C21—C26−95.7 (3)
N1—C8—C9—C14−70.3 (3)C26—C21—C22—C23−2.4 (4)
N2—C8—C9—C10−68.9 (3)N4—C21—C22—C23−176.1 (2)
N1—C8—C9—C10108.4 (2)C21—C22—C23—C240.8 (4)
C14—C9—C10—C110.4 (3)C22—C23—C24—C250.4 (4)
C8—C9—C10—C11−178.28 (19)C23—C24—C25—C260.1 (4)
C9—C10—C11—C12−1.6 (3)C27—N3—C26—C21−177.6 (2)
C9—C10—C11—C15179.03 (19)C27—N3—C26—C254.3 (4)
C10—C11—C12—C132.0 (3)C22—C21—C26—N3−175.4 (2)
C15—C11—C12—C13−178.63 (19)N4—C21—C26—N3−1.7 (3)
C11—C12—C13—C14−1.2 (3)C22—C21—C26—C252.8 (3)
C11—C12—C13—C19−177.46 (18)N4—C21—C26—C25176.5 (2)
C12—C13—C14—C90.0 (3)C24—C25—C26—N3176.5 (2)
C19—C13—C14—C9176.10 (18)C24—C25—C26—C21−1.6 (4)
D—H···AD—HH···AD···AD—H···A
N3—H3B···O1i0.81 (3)2.35 (3)3.038 (3)143 (3)
C4—H4A···Brii0.952.983.719 (3)135
C12—H12A···O1i0.952.373.287 (3)163
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A D—HH⋯A DA D—H⋯A
N3—H3B⋯O1i 0.81 (3)2.35 (3)3.038 (3)143 (3)
C4—H4A⋯Brii 0.952.983.719 (3)135
C12—H12A⋯O1i 0.952.373.287 (3)163

Symmetry codes: (i) ; (ii) .

  4 in total

1.  Probing electronic effects in the asymmetric Heck reaction with the BIPI ligands.

Authors:  Carl A Busacca; Danja Grossbach; Regina C So; Erin M O'Brien; Earl M Spinelli
Journal:  Org Lett       Date:  2003-02-20       Impact factor: 6.005

2.  Catalysis by palladium pincer complexes.

Authors:  Nicklas Selander; Kálmán J Szabó
Journal:  Chem Rev       Date:  2010-11-18       Impact factor: 60.622

3.  A short history of SHELX.

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

4.  Bridged triarylamines: a new class of heterohelicenes.

Authors:  Jason E Field; Thomas J Hill; D Venkataraman
Journal:  J Org Chem       Date:  2003-08-08       Impact factor: 4.354

  4 in total

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