Literature DB >> 22220127

1'-Methyl-4'-[4-(trifluoro-meth-yl)phen-yl]dispiro-[indan-2,2'-pyrrolidine-3',2''-indan]-1,3,1''-trione.

Ang Chee Wei, Mohamed Ashraf Ali, Tan Soo Choon, Madhukar Hemamalini, Hoong-Kun Fun.   

Abstract

In the title compound, C(28)H(20)F(3)NO(3), the pyrrolidine ring adopts a half-chair conformation. The other five-membered rings adopt envelope conformations with the spiro and methylene C atoms as the flap atoms. In the crystal, mol-ecules are connected via weak C-H⋯O hydrogen bonds, forming sheets parallel to the bc plane.

Entities:  

Year:  2011        PMID: 22220127      PMCID: PMC3247509          DOI: 10.1107/S1600536811044527

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


Related literature

For a related structure and background references, see: Wei et al. (2011 ▶). For ring puckering parameters, see: Cremer & Pople (1975 ▶). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986 ▶).

Experimental

Crystal data

C28H20F3NO3 M = 475.45 Monoclinic, a = 7.8070 (2) Å b = 22.0878 (5) Å c = 13.1278 (3) Å β = 101.420 (2)° V = 2218.93 (9) Å3 Z = 4 Mo Kα radiation μ = 0.11 mm−1 T = 100 K 0.27 × 0.15 × 0.13 mm

Data collection

Bruker SMART APEXII CCD diffractometer Absorption correction: multi-scan (SADABS; Bruker, 2009 ▶) T min = 0.971, T max = 0.986 22102 measured reflections 6530 independent reflections 3872 reflections with I > 2σ(I) R int = 0.077

Refinement

R[F 2 > 2σ(F 2)] = 0.070 wR(F 2) = 0.162 S = 1.04 6530 reflections 317 parameters H-atom parameters constrained Δρmax = 0.48 e Å−3 Δρmin = −0.40 e Å−3 Data collection: APEX2 (Bruker, 2009 ▶); cell refinement: SAINT (Bruker, 2009 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009 ▶). Crystal structure: contains datablock(s) global, I. DOI: 10.1107/S1600536811044527/hb6459sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536811044527/hb6459Isup2.hkl Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C28H20F3NO3F(000) = 984
Mr = 475.45Dx = 1.423 Mg m3
Monoclinic, P21/nMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ynCell parameters from 3175 reflections
a = 7.8070 (2) Åθ = 2.4–29.0°
b = 22.0878 (5) ŵ = 0.11 mm1
c = 13.1278 (3) ÅT = 100 K
β = 101.420 (2)°Block, yellow
V = 2218.93 (9) Å30.27 × 0.15 × 0.13 mm
Z = 4
Bruker SMART APEXII CCD diffractometer6530 independent reflections
Radiation source: fine-focus sealed tube3872 reflections with I > 2σ(I)
graphiteRint = 0.077
φ and ω scansθmax = 30.2°, θmin = 1.8°
Absorption correction: multi-scan (SADABS; Bruker, 2009)h = −11→11
Tmin = 0.971, Tmax = 0.986k = −30→31
22102 measured reflectionsl = −18→18
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.070Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.162H-atom parameters constrained
S = 1.04w = 1/[σ2(Fo2) + (0.0624P)2 + 0.6034P] where P = (Fo2 + 2Fc2)/3
6530 reflections(Δ/σ)max < 0.001
317 parametersΔρmax = 0.48 e Å3
0 restraintsΔρmin = −0.40 e Å3
Experimental. The crystal was placed in the cold stream of an Oxford Cryosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1) K.
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 > 2sigma(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
F11.4957 (2)−0.05331 (7)0.55766 (14)0.0444 (4)
F21.4706 (2)−0.11963 (8)0.67246 (11)0.0414 (4)
F31.3006 (2)−0.12198 (7)0.52402 (12)0.0404 (4)
O10.8027 (2)0.12100 (8)1.06182 (12)0.0259 (4)
O20.5579 (2)0.16217 (8)0.71690 (12)0.0283 (4)
O30.9907 (2)0.18882 (7)0.73016 (11)0.0249 (4)
N10.6695 (2)0.05913 (9)0.86261 (14)0.0208 (4)
C10.6883 (3)0.33200 (12)0.90164 (19)0.0264 (5)
H1A0.66430.37290.88130.032*
C20.6425 (3)0.28631 (11)0.82908 (18)0.0236 (5)
H2A0.58790.29520.75940.028*
C30.6793 (3)0.22679 (10)0.86166 (16)0.0200 (5)
C40.6483 (3)0.16958 (11)0.80161 (16)0.0207 (5)
C50.7496 (3)0.11868 (10)0.87093 (16)0.0172 (5)
C60.7754 (3)0.14805 (11)0.97970 (16)0.0195 (5)
C70.7564 (3)0.21422 (10)0.96488 (16)0.0194 (5)
C80.8017 (3)0.26022 (11)1.03752 (17)0.0228 (5)
H8A0.85340.25141.10770.027*
C90.7691 (3)0.31913 (11)1.00426 (18)0.0252 (5)
H9A0.80210.35151.05180.030*
C100.7002 (3)0.03124 (11)0.76618 (17)0.0227 (5)
H10A0.59730.03670.70930.027*
H10B0.7239−0.01260.77630.027*
C110.8606 (3)0.06418 (10)0.74080 (16)0.0183 (5)
H11A0.81580.09250.68220.022*
C120.9279 (3)0.10405 (10)0.83779 (15)0.0160 (4)
C131.0579 (3)0.07642 (10)0.93124 (16)0.0172 (5)
H13A0.99510.05850.98240.021*
H13B1.13160.04490.90780.021*
C141.1665 (3)0.13004 (10)0.97689 (16)0.0171 (5)
C151.2772 (3)0.13615 (11)1.07356 (16)0.0209 (5)
H15A1.29240.10371.12210.025*
C161.3649 (3)0.19073 (11)1.09748 (17)0.0235 (5)
H16A1.43840.19571.16380.028*
C171.3475 (3)0.23843 (11)1.02646 (17)0.0239 (5)
H17A1.40900.27521.04480.029*
C181.2409 (3)0.23229 (10)0.92931 (17)0.0210 (5)
H18A1.22930.26420.87980.025*
C191.1512 (3)0.17805 (10)0.90651 (16)0.0173 (5)
C201.0218 (3)0.16199 (10)0.81240 (16)0.0178 (5)
C210.9976 (3)0.02506 (10)0.70611 (16)0.0172 (5)
C221.0503 (3)−0.03063 (10)0.75231 (16)0.0195 (5)
H22A0.9989−0.04490.80760.023*
C231.1761 (3)−0.06544 (11)0.71882 (16)0.0200 (5)
H23A1.2106−0.10320.75100.024*
C241.2516 (3)−0.04479 (10)0.63779 (16)0.0185 (5)
C251.2032 (3)0.01078 (10)0.59215 (16)0.0203 (5)
H25A1.25590.02520.53750.024*
C261.0776 (3)0.04543 (10)0.62653 (16)0.0194 (5)
H26A1.04560.08360.59530.023*
C271.3791 (3)−0.08444 (11)0.59856 (17)0.0223 (5)
C280.4895 (3)0.05533 (12)0.8773 (2)0.0291 (6)
H28A0.48070.07390.94390.044*
H28B0.45420.01280.87710.044*
H28C0.41270.07680.82070.044*
U11U22U33U12U13U23
F10.0479 (11)0.0266 (9)0.0723 (12)0.0028 (7)0.0446 (9)0.0036 (8)
F20.0411 (10)0.0529 (11)0.0326 (8)0.0268 (8)0.0128 (7)0.0114 (7)
F30.0405 (10)0.0351 (9)0.0443 (9)0.0066 (7)0.0053 (7)−0.0204 (7)
O10.0308 (10)0.0292 (10)0.0189 (7)0.0075 (7)0.0077 (7)0.0047 (7)
O20.0281 (10)0.0321 (10)0.0215 (8)0.0070 (8)−0.0032 (7)−0.0025 (7)
O30.0298 (10)0.0234 (9)0.0200 (8)−0.0010 (7)0.0013 (7)0.0043 (7)
N10.0169 (10)0.0217 (11)0.0247 (9)−0.0028 (8)0.0065 (8)−0.0023 (8)
C10.0215 (12)0.0231 (13)0.0346 (13)0.0046 (10)0.0054 (10)0.0021 (10)
C20.0190 (12)0.0252 (13)0.0259 (11)0.0034 (10)0.0028 (9)0.0038 (10)
C30.0174 (11)0.0214 (13)0.0212 (10)0.0023 (9)0.0036 (9)0.0008 (9)
C40.0182 (11)0.0258 (13)0.0187 (10)0.0036 (9)0.0048 (8)0.0022 (9)
C50.0163 (11)0.0180 (12)0.0178 (9)0.0022 (9)0.0043 (8)−0.0002 (8)
C60.0161 (11)0.0235 (13)0.0189 (10)0.0026 (9)0.0034 (8)−0.0008 (9)
C70.0155 (11)0.0212 (12)0.0216 (10)0.0029 (9)0.0040 (8)−0.0007 (9)
C80.0221 (12)0.0259 (13)0.0202 (10)0.0034 (10)0.0037 (9)−0.0017 (9)
C90.0226 (13)0.0212 (13)0.0312 (12)−0.0011 (10)0.0035 (10)−0.0072 (10)
C100.0180 (12)0.0239 (13)0.0276 (11)−0.0023 (9)0.0081 (9)−0.0055 (10)
C110.0182 (11)0.0186 (12)0.0177 (10)0.0003 (9)0.0024 (8)−0.0012 (9)
C120.0164 (11)0.0153 (11)0.0162 (9)0.0001 (8)0.0028 (8)0.0000 (8)
C130.0145 (11)0.0178 (12)0.0190 (10)0.0018 (8)0.0023 (8)0.0013 (8)
C140.0161 (11)0.0162 (12)0.0196 (10)0.0012 (9)0.0050 (8)−0.0013 (8)
C150.0186 (11)0.0235 (13)0.0201 (10)0.0020 (9)0.0025 (9)0.0027 (9)
C160.0219 (12)0.0276 (14)0.0194 (10)−0.0018 (10)0.0004 (9)−0.0047 (9)
C170.0232 (12)0.0212 (13)0.0280 (11)−0.0037 (10)0.0064 (9)−0.0049 (10)
C180.0220 (12)0.0173 (12)0.0241 (11)−0.0027 (9)0.0059 (9)0.0005 (9)
C190.0178 (11)0.0163 (12)0.0182 (10)0.0007 (8)0.0049 (8)−0.0009 (8)
C200.0171 (11)0.0188 (12)0.0172 (10)0.0022 (9)0.0031 (8)−0.0002 (8)
C210.0168 (11)0.0176 (12)0.0169 (9)−0.0030 (8)0.0022 (8)−0.0033 (8)
C220.0226 (12)0.0181 (12)0.0193 (10)−0.0017 (9)0.0078 (9)−0.0001 (9)
C230.0248 (12)0.0160 (12)0.0195 (10)0.0011 (9)0.0051 (9)0.0006 (8)
C240.0184 (11)0.0188 (12)0.0185 (10)−0.0017 (9)0.0041 (8)−0.0019 (9)
C250.0229 (12)0.0211 (12)0.0180 (10)−0.0020 (9)0.0064 (9)0.0022 (9)
C260.0220 (12)0.0164 (12)0.0195 (10)0.0017 (9)0.0034 (9)0.0014 (8)
C270.0259 (13)0.0201 (13)0.0221 (10)−0.0006 (10)0.0077 (9)0.0014 (9)
C280.0203 (13)0.0342 (15)0.0344 (13)−0.0006 (11)0.0092 (10)−0.0032 (11)
F1—C271.336 (3)C12—C201.544 (3)
F2—C271.335 (3)C12—C131.554 (3)
F3—C271.335 (3)C13—C141.510 (3)
O1—C61.214 (3)C13—H13A0.9900
O2—C41.204 (2)C13—H13B0.9900
O3—C201.213 (2)C14—C151.393 (3)
N1—C51.451 (3)C14—C191.396 (3)
N1—C281.458 (3)C15—C161.391 (3)
N1—C101.470 (3)C15—H15A0.9500
C1—C21.385 (3)C16—C171.396 (3)
C1—C91.399 (3)C16—H16A0.9500
C1—H1A0.9500C17—C181.385 (3)
C2—C31.395 (3)C17—H17A0.9500
C2—H2A0.9500C18—C191.390 (3)
C3—C71.397 (3)C18—H18A0.9500
C3—C41.484 (3)C19—C201.476 (3)
C4—C51.560 (3)C21—C261.393 (3)
C5—C61.545 (3)C21—C221.397 (3)
C5—C121.572 (3)C22—C231.386 (3)
C6—C71.478 (3)C22—H22A0.9500
C7—C81.390 (3)C23—C241.391 (3)
C8—C91.380 (3)C23—H23A0.9500
C8—H8A0.9500C24—C251.385 (3)
C9—H9A0.9500C24—C271.492 (3)
C10—C111.541 (3)C25—C261.388 (3)
C10—H10A0.9900C25—H25A0.9500
C10—H10B0.9900C26—H26A0.9500
C11—C211.513 (3)C28—H28A0.9800
C11—C121.552 (3)C28—H28B0.9800
C11—H11A1.0000C28—H28C0.9800
C5—N1—C28117.03 (19)C14—C13—H13B111.1
C5—N1—C10107.67 (18)C12—C13—H13B111.1
C28—N1—C10114.55 (18)H13A—C13—H13B109.0
C2—C1—C9121.3 (2)C15—C14—C19119.1 (2)
C2—C1—H1A119.3C15—C14—C13129.5 (2)
C9—C1—H1A119.3C19—C14—C13111.44 (17)
C1—C2—C3117.8 (2)C16—C15—C14118.6 (2)
C1—C2—H2A121.1C16—C15—H15A120.7
C3—C2—H2A121.1C14—C15—H15A120.7
C2—C3—C7120.5 (2)C15—C16—C17121.7 (2)
C2—C3—C4129.64 (19)C15—C16—H16A119.2
C7—C3—C4109.86 (19)C17—C16—H16A119.2
O2—C4—C3127.6 (2)C18—C17—C16120.2 (2)
O2—C4—C5125.3 (2)C18—C17—H17A119.9
C3—C4—C5107.07 (17)C16—C17—H17A119.9
N1—C5—C6115.19 (18)C17—C18—C19117.9 (2)
N1—C5—C4116.63 (18)C17—C18—H18A121.1
C6—C5—C4101.22 (17)C19—C18—H18A121.1
N1—C5—C12100.66 (17)C18—C19—C14122.61 (19)
C6—C5—C12112.44 (17)C18—C19—C20128.3 (2)
C4—C5—C12111.17 (17)C14—C19—C20109.03 (19)
O1—C6—C7126.8 (2)O3—C20—C19127.6 (2)
O1—C6—C5125.6 (2)O3—C20—C12125.24 (19)
C7—C6—C5107.60 (17)C19—C20—C12107.10 (17)
C8—C7—C3121.5 (2)C26—C21—C22118.2 (2)
C8—C7—C6128.83 (19)C26—C21—C11119.3 (2)
C3—C7—C6109.68 (19)C22—C21—C11122.5 (2)
C9—C8—C7117.8 (2)C23—C22—C21121.1 (2)
C9—C8—H8A121.1C23—C22—H22A119.4
C7—C8—H8A121.1C21—C22—H22A119.4
C8—C9—C1121.1 (2)C22—C23—C24119.7 (2)
C8—C9—H9A119.5C22—C23—H23A120.2
C1—C9—H9A119.5C24—C23—H23A120.2
N1—C10—C11105.46 (18)C25—C24—C23120.1 (2)
N1—C10—H10A110.6C25—C24—C27121.0 (2)
C11—C10—H10A110.6C23—C24—C27119.0 (2)
N1—C10—H10B110.6C24—C25—C26119.9 (2)
C11—C10—H10B110.6C24—C25—H25A120.1
H10A—C10—H10B108.8C26—C25—H25A120.1
C21—C11—C10116.65 (19)C25—C26—C21121.1 (2)
C21—C11—C12115.24 (17)C25—C26—H26A119.5
C10—C11—C12104.37 (17)C21—C26—H26A119.5
C21—C11—H11A106.6F2—C27—F3105.84 (19)
C10—C11—H11A106.6F2—C27—F1106.4 (2)
C12—C11—H11A106.6F3—C27—F1106.00 (19)
C20—C12—C11113.04 (17)F2—C27—C24112.87 (18)
C20—C12—C13103.42 (16)F3—C27—C24112.13 (19)
C11—C12—C13119.14 (18)F1—C27—C24113.0 (2)
C20—C12—C5111.96 (18)N1—C28—H28A109.5
C11—C12—C599.75 (16)N1—C28—H28B109.5
C13—C12—C5109.75 (17)H28A—C28—H28B109.5
C14—C13—C12103.47 (17)N1—C28—H28C109.5
C14—C13—H13A111.1H28A—C28—H28C109.5
C12—C13—H13A111.1H28B—C28—H28C109.5
C9—C1—C2—C30.2 (4)C6—C5—C12—C11168.65 (18)
C1—C2—C3—C71.3 (4)C4—C5—C12—C11−78.7 (2)
C1—C2—C3—C4−178.9 (2)N1—C5—C12—C13−80.37 (19)
C2—C3—C4—O2−14.0 (4)C6—C5—C12—C1342.7 (2)
C7—C3—C4—O2165.8 (2)C4—C5—C12—C13155.43 (17)
C2—C3—C4—C5168.4 (2)C20—C12—C13—C1422.8 (2)
C7—C3—C4—C5−11.9 (3)C11—C12—C13—C14149.22 (19)
C28—N1—C5—C665.2 (2)C5—C12—C13—C14−96.8 (2)
C10—N1—C5—C6−164.16 (18)C12—C13—C14—C15164.5 (2)
C28—N1—C5—C4−53.3 (3)C12—C13—C14—C19−17.6 (2)
C10—N1—C5—C477.4 (2)C19—C14—C15—C161.8 (3)
C28—N1—C5—C12−173.66 (17)C13—C14—C15—C16179.6 (2)
C10—N1—C5—C12−43.0 (2)C14—C15—C16—C17−1.5 (4)
O2—C4—C5—N1−32.4 (3)C15—C16—C17—C180.1 (4)
C3—C4—C5—N1145.4 (2)C16—C17—C18—C191.0 (4)
O2—C4—C5—C6−158.2 (2)C17—C18—C19—C14−0.7 (4)
C3—C4—C5—C619.6 (2)C17—C18—C19—C20175.5 (2)
O2—C4—C5—C1282.2 (3)C15—C14—C19—C18−0.7 (3)
C3—C4—C5—C12−100.1 (2)C13—C14—C19—C18−178.9 (2)
N1—C5—C6—O131.2 (3)C15—C14—C19—C20−177.5 (2)
C4—C5—C6—O1158.0 (2)C13—C14—C19—C204.3 (3)
C12—C5—C6—O1−83.3 (3)C18—C19—C20—O313.6 (4)
N1—C5—C6—C7−147.48 (19)C14—C19—C20—O3−169.8 (2)
C4—C5—C6—C7−20.7 (2)C18—C19—C20—C12−165.5 (2)
C12—C5—C6—C798.0 (2)C14—C19—C20—C1211.1 (2)
C2—C3—C7—C8−1.2 (4)C11—C12—C20—O329.4 (3)
C4—C3—C7—C8179.0 (2)C13—C12—C20—O3159.7 (2)
C2—C3—C7—C6178.0 (2)C5—C12—C20—O3−82.3 (3)
C4—C3—C7—C6−1.9 (3)C11—C12—C20—C19−151.44 (18)
O1—C6—C7—C815.4 (4)C13—C12—C20—C19−21.2 (2)
C5—C6—C7—C8−165.9 (2)C5—C12—C20—C1996.9 (2)
O1—C6—C7—C3−163.7 (2)C10—C11—C21—C26140.2 (2)
C5—C6—C7—C315.0 (2)C12—C11—C21—C26−96.9 (2)
C3—C7—C8—C9−0.4 (4)C10—C11—C21—C22−41.1 (3)
C6—C7—C8—C9−179.4 (2)C12—C11—C21—C2281.9 (3)
C7—C8—C9—C11.9 (4)C26—C21—C22—C23−1.3 (3)
C2—C1—C9—C8−1.8 (4)C11—C21—C22—C23−180.0 (2)
C5—N1—C10—C1122.4 (2)C21—C22—C23—C240.0 (3)
C28—N1—C10—C11154.43 (19)C22—C23—C24—C251.1 (3)
N1—C10—C11—C21136.47 (19)C22—C23—C24—C27−176.4 (2)
N1—C10—C11—C128.1 (2)C23—C24—C25—C26−0.9 (3)
C21—C11—C12—C2079.4 (2)C27—C24—C25—C26176.6 (2)
C10—C11—C12—C20−151.33 (18)C24—C25—C26—C21−0.5 (3)
C21—C11—C12—C13−42.3 (3)C22—C21—C26—C251.5 (3)
C10—C11—C12—C1386.9 (2)C11—C21—C26—C25−179.70 (19)
C21—C11—C12—C5−161.54 (18)C25—C24—C27—F2151.1 (2)
C10—C11—C12—C5−32.3 (2)C23—C24—C27—F2−31.4 (3)
N1—C5—C12—C20165.38 (16)C25—C24—C27—F3−89.5 (3)
C6—C5—C12—C20−71.5 (2)C23—C24—C27—F388.0 (2)
C4—C5—C12—C2041.2 (2)C25—C24—C27—F130.2 (3)
N1—C5—C12—C1145.54 (19)C23—C24—C27—F1−152.2 (2)
D—H···AD—HH···AD···AD—H···A
C17—H17A···O3i0.952.523.130 (3)122
C23—H23A···O1ii0.952.513.104 (3)121
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯AD—HH⋯ADAD—H⋯A
C17—H17A⋯O3i0.952.523.130 (3)122
C23—H23A⋯O1ii0.952.513.104 (3)121

Symmetry codes: (i) ; (ii) .

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1.  A short history of SHELX.

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

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Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2011-10-29

3.  Structure validation in chemical crystallography.

Authors:  Anthony L Spek
Journal:  Acta Crystallogr D Biol Crystallogr       Date:  2009-01-20
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1.  Methyl 5''-chloro-1',1''-dimethyl-2,2''-dioxodi-spiro-[indoline-3,2'-pyrrolidine-3',3''-indoline]-4'-carboxyl-ate.

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Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2013-05-04

2.  Methyl (3R*,3'S*)-1',1''-dimethyl-2,2''-dioxodispiro-[indoline-3,2'-pyrrolidine-3',3''-indoline]-4'-carboxyl-ate.

Authors:  G Ganesh; Panneer Selvam Yuvaraj; E Govindan; Boreddy S R Reddy; A Subbiahpandi
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2012-09-08

3.  A triclinic polymorph of methyl (3R,3'S)-1',1''-dimethyl-2,2''-dioxodispiro-[indoline-3,2'-pyrrolidine-3',3''-indoline]-4'-carboxyl-ate.

Authors:  G Ganesh; Panneer Selvam Yuvaraj; Chinthalapuri Divakara; Boreddy S R Reddy; A Subbiahpandi
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