accessSupporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536811048604/kj2194sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536811048604/kj2194Isup2.hkl | |
Chemical Markup Language (CML) file https://doi.org/10.1107/S1600536811048604/kj2194Isup3.cml |
CCDC reference: 858545
The preparation of the title compound has been described by Boese et al. (1997). Crystals were grown by slow evaporation from dichloromethane and deuterochloroform.
All H atoms were placed in calculated positions guided by difference maps. The C—H bond distances were constrained to the range from 0.95 to 1.0 Å, depending on C atom type, and Uiso= 1.2Ueq (1.5 for methyl groups), thereafter refined as riding. A torsional parameter was refined for each methyl group.
The title compound, C48H40, is a tetraisopropyl-substituted polyannulenoenyne and its structure was determined at 90 K. The 295 K structure of the unsubstituted parent annulene, C36H16, was previously determined by Boese et al. (1997; CSD: RICVEE, Allen, 2002; CAS: 186494–87-1), and is of quasi-D2 (222) symmetry, as determined by least-squares fit (Gould et al., 1988; δr.m.s. = 0.239 Å) of all 36 common carbon atoms of the parent to a model of C36H16 optimized in D2 symmetry by molecular mechanics (Cambridgesoft, 2010). Reasonable agreements result from the same least-squares fit of the title compound (at 90 K) to the parent (δr.m.s. =0.419 Å) and to the optimized model (δr.m.s. = 0.426 Å).
The six C≡C triple bond distances are all experimentally equal, falling in the narrow range 1.203 (2) - 1.206 (2) Å, while the C–C bonds linking the triple bonds have length C16—C17 1.370 (2) and C34—C35 1.377 (2) Å. The acetylenic bridges are slightly bowed outward, with C–C≡C angles in the range 177.59 (18) - 179.17 (18)° for the butadiyne bridges and in the range 174.43 (17) - 176.80 (17)° for the acetylene bridges. Distances between the following bond centroids provide a measure of overall molecular dimensions: C16—C17 to C34—C35 = 3.341 (2) Å, C7 ≡C8 to C25 ≡C26 = 7.650 (2) Å.
For a description of the Cambridge Structural Database, see: Allen (2002). For the synthesis and a related structure, see: Boese et al. (1997). For molecular mechanics software, see: Cambridgesoft (2010).
Data collection: COLLECT (Nonius, 2000); cell refinement: SCALEPACK (Otwinowski & Minor, 1997); data reduction: DENZO and SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: IDEAL (Gould et al., 1988) and WinGX (Farrugia, 1999).
| C48H40 | F(000) = 1312 |
| Mr = 616.8 | Dx = 1.133 Mg m−3 |
| Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
| Hall symbol: -P 2ybc | Cell parameters from 7618 reflections |
| a = 18.0007 (4) Å | θ = 2.6–29.1° |
| b = 12.5083 (3) Å | µ = 0.06 mm−1 |
| c = 16.0674 (4) Å | T = 90 K |
| β = 91.004 (1)° | Prism, golden yellow |
| V = 3617.15 (15) Å3 | 0.45 × 0.30 × 0.30 mm |
| Z = 4 |
| Nonius KappaCCD diffractometer | 8186 independent reflections |
| Radiation source: sealed tube | 5354 reflections with I > 2σ(I) |
| Horizonally mounted graphite crystal monochromator | Rint = 0.035 |
| Detector resolution: 9 pixels mm-1 | θmax = 28.9°, θmin = 2.8° |
| CCD rotation images, thick slices scans | h = −23→23 |
| Absorption correction: multi-scan (SCALEPACK; Otwinowski & Minor 1997) | k = −16→14 |
| Tmin = 0.972, Tmax = 0.981 | l = −19→20 |
| 13998 measured reflections |
| Refinement on F2 | Secondary atom site location: difference Fourier map |
| Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
| R[F2 > 2σ(F2)] = 0.049 | H-atom parameters constrained |
| wR(F2) = 0.127 | w = 1/[σ2(Fo2) + (0.0543P)2 + 1.183P] where P = (Fo2 + 2Fc2)/3 |
| S = 1.02 | (Δ/σ)max = 0.001 |
| 8186 reflections | Δρmax = 0.25 e Å−3 |
| 442 parameters | Δρmin = −0.28 e Å−3 |
| 0 restraints | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
| 0 constraints | Extinction coefficient: 0.0017 (4) |
| Primary atom site location: structure-invariant direct methods |
| C48H40 | V = 3617.15 (15) Å3 |
| Mr = 616.8 | Z = 4 |
| Monoclinic, P21/c | Mo Kα radiation |
| a = 18.0007 (4) Å | µ = 0.06 mm−1 |
| b = 12.5083 (3) Å | T = 90 K |
| c = 16.0674 (4) Å | 0.45 × 0.30 × 0.30 mm |
| β = 91.004 (1)° |
| Nonius KappaCCD diffractometer | 8186 independent reflections |
| Absorption correction: multi-scan (SCALEPACK; Otwinowski & Minor 1997) | 5354 reflections with I > 2σ(I) |
| Tmin = 0.972, Tmax = 0.981 | Rint = 0.035 |
| 13998 measured reflections |
| R[F2 > 2σ(F2)] = 0.049 | 0 restraints |
| wR(F2) = 0.127 | H-atom parameters constrained |
| S = 1.02 | Δρmax = 0.25 e Å−3 |
| 8186 reflections | Δρmin = −0.28 e Å−3 |
| 442 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. |
| x | y | z | Uiso*/Ueq | ||
| C1 | 0.34021 (9) | 0.67572 (12) | −0.03559 (9) | 0.0209 (3) | |
| C2 | 0.37458 (9) | 0.65496 (13) | −0.11163 (9) | 0.0230 (4) | |
| H2 | 0.3986 | 0.5882 | −0.1196 | 0.028* | |
| C3 | 0.37425 (9) | 0.72994 (13) | −0.17553 (9) | 0.0239 (4) | |
| C4 | 0.33685 (9) | 0.82602 (13) | −0.16283 (9) | 0.0250 (4) | |
| H4 | 0.3348 | 0.8774 | −0.2064 | 0.03* | |
| C5 | 0.30274 (9) | 0.84840 (13) | −0.08857 (9) | 0.0240 (4) | |
| H5 | 0.2781 | 0.9149 | −0.0816 | 0.029* | |
| C6 | 0.30408 (9) | 0.77426 (12) | −0.02347 (9) | 0.0211 (3) | |
| C7 | 0.26840 (9) | 0.79587 (12) | 0.05395 (9) | 0.0221 (3) | |
| C8 | 0.23760 (9) | 0.80786 (12) | 0.11918 (9) | 0.0221 (3) | |
| C9 | 0.20160 (8) | 0.81294 (12) | 0.19792 (9) | 0.0215 (3) | |
| C10 | 0.20544 (9) | 0.90410 (13) | 0.24814 (10) | 0.0264 (4) | |
| H10 | 0.2289 | 0.9669 | 0.2282 | 0.032* | |
| C11 | 0.17525 (9) | 0.90345 (13) | 0.32691 (10) | 0.0269 (4) | |
| H11 | 0.1793 | 0.9658 | 0.3604 | 0.032* | |
| C12 | 0.13916 (9) | 0.81390 (13) | 0.35838 (9) | 0.0223 (3) | |
| C13 | 0.13314 (9) | 0.72469 (12) | 0.30736 (9) | 0.0208 (3) | |
| H13 | 0.1073 | 0.6636 | 0.3267 | 0.025* | |
| C14 | 0.16417 (8) | 0.72248 (12) | 0.22813 (9) | 0.0198 (3) | |
| C15 | 0.15945 (9) | 0.62679 (12) | 0.17971 (9) | 0.0216 (3) | |
| C16 | 0.15709 (9) | 0.54517 (12) | 0.13983 (9) | 0.0215 (3) | |
| C17 | 0.15610 (9) | 0.45239 (12) | 0.09457 (9) | 0.0223 (3) | |
| C18 | 0.15587 (9) | 0.36996 (13) | 0.05588 (9) | 0.0232 (3) | |
| C19 | 0.15470 (9) | 0.27065 (12) | 0.01184 (9) | 0.0219 (3) | |
| C20 | 0.12070 (9) | 0.26396 (13) | −0.06716 (9) | 0.0237 (4) | |
| H20 | 0.0977 | 0.3257 | −0.0905 | 0.028* | |
| C21 | 0.11988 (9) | 0.16932 (13) | −0.11210 (10) | 0.0256 (4) | |
| C22 | 0.15239 (10) | 0.07952 (13) | −0.07467 (10) | 0.0300 (4) | |
| H22 | 0.1519 | 0.0136 | −0.104 | 0.036* | |
| C23 | 0.18519 (9) | 0.08346 (13) | 0.00358 (10) | 0.0281 (4) | |
| H23 | 0.2058 | 0.0204 | 0.0275 | 0.034* | |
| C24 | 0.18827 (9) | 0.17957 (12) | 0.04787 (9) | 0.0230 (3) | |
| C25 | 0.22660 (9) | 0.18904 (12) | 0.12662 (10) | 0.0235 (4) | |
| C26 | 0.25924 (9) | 0.20612 (12) | 0.19125 (10) | 0.0240 (4) | |
| C27 | 0.29570 (9) | 0.23181 (12) | 0.26867 (9) | 0.0228 (3) | |
| C28 | 0.29559 (9) | 0.16136 (14) | 0.33603 (10) | 0.0289 (4) | |
| H28 | 0.2728 | 0.0932 | 0.3298 | 0.035* | |
| C29 | 0.32799 (9) | 0.18895 (13) | 0.41168 (10) | 0.0286 (4) | |
| H29 | 0.3269 | 0.1394 | 0.4564 | 0.034* | |
| C30 | 0.36228 (9) | 0.28784 (13) | 0.42378 (9) | 0.0238 (4) | |
| C31 | 0.36368 (9) | 0.35806 (13) | 0.35677 (9) | 0.0225 (3) | |
| H31 | 0.387 | 0.4257 | 0.3636 | 0.027* | |
| C32 | 0.33159 (9) | 0.33165 (12) | 0.27927 (9) | 0.0213 (3) | |
| C33 | 0.33649 (9) | 0.40474 (12) | 0.21094 (9) | 0.0224 (3) | |
| C34 | 0.34108 (9) | 0.46519 (12) | 0.15295 (9) | 0.0233 (4) | |
| C35 | 0.34333 (9) | 0.53578 (12) | 0.08726 (9) | 0.0232 (4) | |
| C36 | 0.34260 (9) | 0.59846 (12) | 0.03031 (9) | 0.0228 (3) | |
| C37 | 0.41549 (10) | 0.71348 (14) | −0.25636 (10) | 0.0301 (4) | |
| H37 | 0.3804 | 0.7324 | −0.303 | 0.036* | |
| C38 | 0.48096 (10) | 0.79092 (15) | −0.26042 (11) | 0.0377 (5) | |
| H38A | 0.4631 | 0.8642 | −0.2528 | 0.057* | |
| H38B | 0.5045 | 0.7847 | −0.3148 | 0.057* | |
| H38C | 0.5173 | 0.7735 | −0.2163 | 0.057* | |
| C39 | 0.44060 (12) | 0.59924 (15) | −0.27061 (12) | 0.0442 (5) | |
| H39A | 0.4774 | 0.5793 | −0.2277 | 0.066* | |
| H39B | 0.4628 | 0.5934 | −0.3257 | 0.066* | |
| H39C | 0.3977 | 0.5512 | −0.2676 | 0.066* | |
| C40 | 0.10830 (9) | 0.81729 (13) | 0.44585 (9) | 0.0261 (4) | |
| H40 | 0.1495 | 0.8419 | 0.4838 | 0.031* | |
| C41 | 0.08181 (10) | 0.70983 (14) | 0.47865 (10) | 0.0315 (4) | |
| H41A | 0.0394 | 0.685 | 0.4449 | 0.047* | |
| H41B | 0.0668 | 0.7177 | 0.5367 | 0.047* | |
| H41C | 0.1222 | 0.6576 | 0.4755 | 0.047* | |
| C42 | 0.04634 (10) | 0.89944 (14) | 0.45132 (10) | 0.0308 (4) | |
| H42A | 0.0642 | 0.9687 | 0.4315 | 0.046* | |
| H42B | 0.0309 | 0.9062 | 0.5093 | 0.046* | |
| H42C | 0.0039 | 0.8764 | 0.4167 | 0.046* | |
| C43 | 0.08507 (10) | 0.16014 (14) | −0.19909 (10) | 0.0317 (4) | |
| H43 | 0.1231 | 0.1266 | −0.2354 | 0.038* | |
| C44 | 0.06418 (11) | 0.26707 (15) | −0.23850 (10) | 0.0359 (4) | |
| H44A | 0.0244 | 0.3003 | −0.2067 | 0.054* | |
| H44B | 0.0471 | 0.2555 | −0.296 | 0.054* | |
| H44C | 0.1077 | 0.3142 | −0.2381 | 0.054* | |
| C45 | 0.01798 (11) | 0.08507 (15) | −0.19878 (11) | 0.0392 (5) | |
| H45A | 0.0326 | 0.0164 | −0.1741 | 0.059* | |
| H45B | 0.0001 | 0.0736 | −0.256 | 0.059* | |
| H45C | −0.0217 | 0.1171 | −0.166 | 0.059* | |
| C46 | 0.40087 (9) | 0.31230 (14) | 0.50654 (9) | 0.0294 (4) | |
| H46 | 0.3752 | 0.27 | 0.5504 | 0.035* | |
| C47 | 0.39803 (11) | 0.42839 (15) | 0.53199 (11) | 0.0393 (5) | |
| H47A | 0.4255 | 0.4716 | 0.492 | 0.059* | |
| H47B | 0.4205 | 0.4367 | 0.5876 | 0.059* | |
| H47C | 0.3462 | 0.4522 | 0.5329 | 0.059* | |
| C48 | 0.48084 (12) | 0.2742 (2) | 0.50436 (13) | 0.0581 (7) | |
| H48A | 0.4818 | 0.1969 | 0.4948 | 0.087* | |
| H48B | 0.5057 | 0.2906 | 0.5576 | 0.087* | |
| H48C | 0.5066 | 0.3106 | 0.4592 | 0.087* |
| U11 | U22 | U33 | U12 | U13 | U23 | |
| C1 | 0.0265 (8) | 0.0179 (8) | 0.0181 (7) | −0.0032 (7) | −0.0015 (6) | 0.0005 (6) |
| C2 | 0.0273 (9) | 0.0204 (8) | 0.0212 (8) | −0.0019 (7) | −0.0010 (6) | −0.0032 (6) |
| C3 | 0.0281 (9) | 0.0263 (9) | 0.0174 (8) | −0.0052 (7) | −0.0001 (6) | −0.0020 (6) |
| C4 | 0.0298 (9) | 0.0244 (9) | 0.0208 (8) | −0.0027 (7) | −0.0001 (7) | 0.0048 (7) |
| C5 | 0.0274 (9) | 0.0193 (8) | 0.0251 (8) | 0.0011 (7) | 0.0005 (7) | 0.0019 (6) |
| C6 | 0.0240 (8) | 0.0198 (8) | 0.0196 (8) | −0.0029 (7) | 0.0001 (6) | −0.0008 (6) |
| C7 | 0.0268 (8) | 0.0158 (8) | 0.0238 (8) | −0.0017 (7) | −0.0011 (7) | 0.0006 (6) |
| C8 | 0.0272 (8) | 0.0154 (8) | 0.0237 (8) | −0.0013 (7) | −0.0002 (7) | −0.0001 (6) |
| C9 | 0.0250 (8) | 0.0194 (8) | 0.0200 (8) | 0.0021 (7) | 0.0001 (6) | −0.0015 (6) |
| C10 | 0.0321 (9) | 0.0175 (8) | 0.0296 (9) | −0.0049 (7) | 0.0045 (7) | −0.0040 (7) |
| C11 | 0.0329 (9) | 0.0209 (9) | 0.0269 (9) | −0.0021 (7) | 0.0035 (7) | −0.0084 (7) |
| C12 | 0.0232 (8) | 0.0218 (8) | 0.0220 (8) | 0.0043 (7) | 0.0008 (6) | −0.0030 (6) |
| C13 | 0.0251 (8) | 0.0170 (8) | 0.0204 (8) | 0.0016 (7) | 0.0001 (6) | −0.0001 (6) |
| C14 | 0.0230 (8) | 0.0162 (8) | 0.0200 (7) | 0.0024 (7) | −0.0019 (6) | −0.0026 (6) |
| C15 | 0.0280 (9) | 0.0186 (8) | 0.0182 (8) | 0.0013 (7) | 0.0019 (6) | 0.0015 (6) |
| C16 | 0.0271 (9) | 0.0190 (8) | 0.0186 (8) | 0.0000 (7) | −0.0001 (6) | 0.0024 (6) |
| C17 | 0.0285 (9) | 0.0185 (8) | 0.0198 (8) | 0.0002 (7) | −0.0009 (6) | −0.0003 (6) |
| C18 | 0.0266 (9) | 0.0218 (8) | 0.0212 (8) | 0.0004 (7) | 0.0004 (6) | 0.0002 (7) |
| C19 | 0.0259 (8) | 0.0179 (8) | 0.0220 (8) | −0.0006 (7) | 0.0025 (6) | −0.0043 (6) |
| C20 | 0.0274 (9) | 0.0210 (8) | 0.0228 (8) | 0.0024 (7) | −0.0004 (7) | −0.0017 (6) |
| C21 | 0.0278 (9) | 0.0244 (9) | 0.0247 (8) | 0.0020 (7) | −0.0013 (7) | −0.0062 (7) |
| C22 | 0.0384 (10) | 0.0209 (9) | 0.0306 (9) | 0.0025 (8) | −0.0061 (8) | −0.0100 (7) |
| C23 | 0.0354 (10) | 0.0175 (8) | 0.0311 (9) | 0.0039 (7) | −0.0051 (7) | −0.0039 (7) |
| C24 | 0.0263 (8) | 0.0213 (8) | 0.0214 (8) | −0.0015 (7) | −0.0004 (6) | −0.0019 (6) |
| C25 | 0.0300 (9) | 0.0156 (8) | 0.0251 (8) | −0.0001 (7) | 0.0020 (7) | −0.0015 (6) |
| C26 | 0.0314 (9) | 0.0163 (8) | 0.0243 (8) | −0.0020 (7) | 0.0015 (7) | 0.0011 (6) |
| C27 | 0.0271 (9) | 0.0211 (8) | 0.0203 (8) | 0.0009 (7) | 0.0001 (6) | 0.0004 (6) |
| C28 | 0.0365 (10) | 0.0219 (9) | 0.0283 (9) | −0.0067 (8) | −0.0015 (7) | 0.0037 (7) |
| C29 | 0.0359 (10) | 0.0275 (9) | 0.0225 (8) | −0.0015 (8) | 0.0010 (7) | 0.0076 (7) |
| C30 | 0.0259 (8) | 0.0255 (9) | 0.0202 (8) | 0.0054 (7) | 0.0014 (6) | −0.0001 (7) |
| C31 | 0.0251 (8) | 0.0192 (8) | 0.0232 (8) | 0.0006 (7) | 0.0002 (6) | −0.0013 (6) |
| C32 | 0.0254 (8) | 0.0191 (8) | 0.0194 (8) | 0.0030 (7) | 0.0013 (6) | 0.0002 (6) |
| C33 | 0.0269 (9) | 0.0186 (8) | 0.0215 (8) | −0.0006 (7) | −0.0021 (6) | −0.0030 (7) |
| C34 | 0.0289 (9) | 0.0188 (8) | 0.0221 (8) | −0.0002 (7) | −0.0011 (7) | −0.0025 (7) |
| C35 | 0.0292 (9) | 0.0192 (8) | 0.0211 (8) | −0.0002 (7) | 0.0002 (7) | −0.0016 (6) |
| C36 | 0.0267 (9) | 0.0196 (8) | 0.0221 (8) | −0.0008 (7) | −0.0001 (7) | −0.0035 (7) |
| C37 | 0.0373 (10) | 0.0342 (10) | 0.0188 (8) | −0.0040 (8) | 0.0036 (7) | −0.0022 (7) |
| C38 | 0.0444 (11) | 0.0346 (11) | 0.0346 (10) | −0.0041 (9) | 0.0157 (8) | −0.0031 (8) |
| C39 | 0.0608 (13) | 0.0367 (11) | 0.0358 (10) | −0.0074 (10) | 0.0218 (9) | −0.0126 (8) |
| C40 | 0.0319 (9) | 0.0263 (9) | 0.0203 (8) | 0.0034 (8) | 0.0017 (7) | −0.0054 (7) |
| C41 | 0.0420 (11) | 0.0312 (10) | 0.0216 (8) | 0.0035 (8) | 0.0060 (7) | 0.0005 (7) |
| C42 | 0.0346 (10) | 0.0300 (10) | 0.0278 (9) | 0.0053 (8) | 0.0055 (7) | −0.0044 (7) |
| C43 | 0.0375 (10) | 0.0329 (10) | 0.0245 (9) | 0.0040 (8) | −0.0054 (7) | −0.0093 (7) |
| C44 | 0.0410 (11) | 0.0415 (11) | 0.0251 (9) | 0.0019 (9) | −0.0056 (8) | −0.0020 (8) |
| C45 | 0.0453 (11) | 0.0364 (11) | 0.0356 (10) | −0.0001 (9) | −0.0124 (9) | −0.0080 (8) |
| C46 | 0.0348 (10) | 0.0362 (10) | 0.0172 (8) | 0.0052 (8) | −0.0012 (7) | −0.0009 (7) |
| C47 | 0.0482 (12) | 0.0394 (11) | 0.0299 (10) | −0.0024 (9) | −0.0119 (8) | −0.0046 (8) |
| C48 | 0.0526 (14) | 0.0865 (18) | 0.0347 (11) | 0.0291 (13) | −0.0175 (10) | −0.0187 (11) |
| C1—C2 | 1.403 (2) | C29—C30 | 1.394 (2) |
| C1—C6 | 1.409 (2) | C29—H29 | 0.95 |
| C1—C36 | 1.434 (2) | C30—C31 | 1.390 (2) |
| C2—C3 | 1.391 (2) | C30—C46 | 1.520 (2) |
| C2—H2 | 0.95 | C31—C32 | 1.403 (2) |
| C3—C4 | 1.394 (2) | C31—H31 | 0.95 |
| C3—C37 | 1.521 (2) | C32—C33 | 1.432 (2) |
| C4—C5 | 1.380 (2) | C33—C34 | 1.204 (2) |
| C4—H4 | 0.95 | C34—C35 | 1.377 (2) |
| C5—C6 | 1.398 (2) | C35—C36 | 1.205 (2) |
| C5—H5 | 0.95 | C37—C39 | 1.517 (3) |
| C6—C7 | 1.436 (2) | C37—C38 | 1.528 (2) |
| C7—C8 | 1.204 (2) | C37—H37 | 1 |
| C8—C9 | 1.433 (2) | C38—H38A | 0.98 |
| C9—C10 | 1.398 (2) | C38—H38B | 0.98 |
| C9—C14 | 1.408 (2) | C38—H38C | 0.98 |
| C10—C11 | 1.386 (2) | C39—H39A | 0.98 |
| C10—H10 | 0.95 | C39—H39B | 0.98 |
| C11—C12 | 1.394 (2) | C39—H39C | 0.98 |
| C11—H11 | 0.95 | C40—C42 | 1.520 (2) |
| C12—C13 | 1.388 (2) | C40—C41 | 1.523 (2) |
| C12—C40 | 1.521 (2) | C40—H40 | 1 |
| C13—C14 | 1.399 (2) | C41—H41A | 0.98 |
| C13—H13 | 0.95 | C41—H41B | 0.98 |
| C14—C15 | 1.429 (2) | C41—H41C | 0.98 |
| C15—C16 | 1.206 (2) | C42—H42A | 0.98 |
| C16—C17 | 1.370 (2) | C42—H42B | 0.98 |
| C17—C18 | 1.204 (2) | C42—H42C | 0.98 |
| C18—C19 | 1.430 (2) | C43—C44 | 1.524 (2) |
| C19—C20 | 1.402 (2) | C43—C45 | 1.530 (3) |
| C19—C24 | 1.409 (2) | C43—H43 | 1 |
| C20—C21 | 1.386 (2) | C44—H44A | 0.98 |
| C20—H20 | 0.95 | C44—H44B | 0.98 |
| C21—C22 | 1.398 (2) | C44—H44C | 0.98 |
| C21—C43 | 1.526 (2) | C45—H45A | 0.98 |
| C22—C23 | 1.381 (2) | C45—H45B | 0.98 |
| C22—H22 | 0.95 | C45—H45C | 0.98 |
| C23—C24 | 1.398 (2) | C46—C47 | 1.510 (2) |
| C23—H23 | 0.95 | C46—C48 | 1.517 (3) |
| C24—C25 | 1.436 (2) | C46—H46 | 1 |
| C25—C26 | 1.203 (2) | C47—H47A | 0.98 |
| C26—C27 | 1.433 (2) | C47—H47B | 0.98 |
| C27—C28 | 1.396 (2) | C47—H47C | 0.98 |
| C27—C32 | 1.415 (2) | C48—H48A | 0.98 |
| C28—C29 | 1.383 (2) | C48—H48B | 0.98 |
| C28—H28 | 0.95 | C48—H48C | 0.98 |
| C2—C1—C6 | 119.60 (13) | C31—C32—C33 | 120.00 (14) |
| C2—C1—C36 | 120.68 (14) | C27—C32—C33 | 120.34 (13) |
| C6—C1—C36 | 119.71 (13) | C34—C33—C32 | 179.17 (18) |
| C3—C2—C1 | 121.45 (15) | C33—C34—C35 | 177.59 (18) |
| C3—C2—H2 | 119.3 | C36—C35—C34 | 177.59 (18) |
| C1—C2—H2 | 119.3 | C35—C36—C1 | 177.89 (17) |
| C2—C3—C4 | 117.98 (14) | C39—C37—C3 | 114.04 (14) |
| C2—C3—C37 | 122.91 (15) | C39—C37—C38 | 111.02 (15) |
| C4—C3—C37 | 119.06 (14) | C3—C37—C38 | 109.82 (13) |
| C5—C4—C3 | 121.64 (14) | C39—C37—H37 | 107.2 |
| C5—C4—H4 | 119.2 | C3—C37—H37 | 107.2 |
| C3—C4—H4 | 119.2 | C38—C37—H37 | 107.2 |
| C4—C5—C6 | 120.69 (15) | C37—C38—H38A | 109.5 |
| C4—C5—H5 | 119.7 | C37—C38—H38B | 109.5 |
| C6—C5—H5 | 119.7 | H38A—C38—H38B | 109.5 |
| C5—C6—C1 | 118.62 (14) | C37—C38—H38C | 109.5 |
| C5—C6—C7 | 121.42 (14) | H38A—C38—H38C | 109.5 |
| C1—C6—C7 | 119.95 (13) | H38B—C38—H38C | 109.5 |
| C8—C7—C6 | 176.25 (16) | C37—C39—H39A | 109.5 |
| C7—C8—C9 | 175.33 (17) | C37—C39—H39B | 109.5 |
| C10—C9—C14 | 118.40 (14) | H39A—C39—H39B | 109.5 |
| C10—C9—C8 | 121.83 (14) | C37—C39—H39C | 109.5 |
| C14—C9—C8 | 119.70 (14) | H39A—C39—H39C | 109.5 |
| C11—C10—C9 | 120.41 (15) | H39B—C39—H39C | 109.5 |
| C11—C10—H10 | 119.8 | C42—C40—C12 | 110.63 (13) |
| C9—C10—H10 | 119.8 | C42—C40—C41 | 110.00 (14) |
| C10—C11—C12 | 121.90 (14) | C12—C40—C41 | 114.63 (13) |
| C10—C11—H11 | 119 | C42—C40—H40 | 107.1 |
| C12—C11—H11 | 119 | C12—C40—H40 | 107.1 |
| C13—C12—C11 | 117.63 (14) | C41—C40—H40 | 107.1 |
| C13—C12—C40 | 122.84 (14) | C40—C41—H41A | 109.5 |
| C11—C12—C40 | 119.53 (14) | C40—C41—H41B | 109.5 |
| C12—C13—C14 | 121.67 (14) | H41A—C41—H41B | 109.5 |
| C12—C13—H13 | 119.2 | C40—C41—H41C | 109.5 |
| C14—C13—H13 | 119.2 | H41A—C41—H41C | 109.5 |
| C13—C14—C9 | 119.93 (14) | H41B—C41—H41C | 109.5 |
| C13—C14—C15 | 119.39 (14) | C40—C42—H42A | 109.5 |
| C9—C14—C15 | 120.64 (13) | C40—C42—H42B | 109.5 |
| C16—C15—C14 | 178.34 (17) | H42A—C42—H42B | 109.5 |
| C15—C16—C17 | 178.73 (18) | C40—C42—H42C | 109.5 |
| C18—C17—C16 | 178.88 (18) | H42A—C42—H42C | 109.5 |
| C17—C18—C19 | 178.44 (17) | H42B—C42—H42C | 109.5 |
| C20—C19—C24 | 120.06 (14) | C44—C43—C21 | 114.14 (14) |
| C20—C19—C18 | 120.17 (14) | C44—C43—C45 | 110.55 (15) |
| C24—C19—C18 | 119.78 (13) | C21—C43—C45 | 110.78 (14) |
| C21—C20—C19 | 121.53 (15) | C44—C43—H43 | 107 |
| C21—C20—H20 | 119.2 | C21—C43—H43 | 107 |
| C19—C20—H20 | 119.2 | C45—C43—H43 | 107 |
| C20—C21—C22 | 117.49 (14) | C43—C44—H44A | 109.5 |
| C20—C21—C43 | 122.80 (15) | C43—C44—H44B | 109.5 |
| C22—C21—C43 | 119.72 (14) | H44A—C44—H44B | 109.5 |
| C23—C22—C21 | 122.16 (15) | C43—C44—H44C | 109.5 |
| C23—C22—H22 | 118.9 | H44A—C44—H44C | 109.5 |
| C21—C22—H22 | 118.9 | H44B—C44—H44C | 109.5 |
| C22—C23—C24 | 120.46 (15) | C43—C45—H45A | 109.5 |
| C22—C23—H23 | 119.8 | C43—C45—H45B | 109.5 |
| C24—C23—H23 | 119.8 | H45A—C45—H45B | 109.5 |
| C23—C24—C19 | 118.25 (14) | C43—C45—H45C | 109.5 |
| C23—C24—C25 | 122.27 (15) | H45A—C45—H45C | 109.5 |
| C19—C24—C25 | 119.44 (14) | H45B—C45—H45C | 109.5 |
| C26—C25—C24 | 174.43 (17) | C47—C46—C48 | 110.17 (17) |
| C25—C26—C27 | 176.80 (17) | C47—C46—C30 | 114.42 (14) |
| C28—C27—C32 | 118.09 (14) | C48—C46—C30 | 109.62 (14) |
| C28—C27—C26 | 121.65 (15) | C47—C46—H46 | 107.5 |
| C32—C27—C26 | 120.24 (14) | C48—C46—H46 | 107.5 |
| C29—C28—C27 | 121.18 (15) | C30—C46—H46 | 107.5 |
| C29—C28—H28 | 119.4 | C46—C47—H47A | 109.5 |
| C27—C28—H28 | 119.4 | C46—C47—H47B | 109.5 |
| C28—C29—C30 | 121.52 (15) | H47A—C47—H47B | 109.5 |
| C28—C29—H29 | 119.2 | C46—C47—H47C | 109.5 |
| C30—C29—H29 | 119.2 | H47A—C47—H47C | 109.5 |
| C31—C30—C29 | 117.81 (14) | H47B—C47—H47C | 109.5 |
| C31—C30—C46 | 122.41 (15) | C46—C48—H48A | 109.5 |
| C29—C30—C46 | 119.65 (14) | C46—C48—H48B | 109.5 |
| C30—C31—C32 | 121.73 (15) | H48A—C48—H48B | 109.5 |
| C30—C31—H31 | 119.1 | C46—C48—H48C | 109.5 |
| C32—C31—H31 | 119.1 | H48A—C48—H48C | 109.5 |
| C31—C32—C27 | 119.64 (14) | H48B—C48—H48C | 109.5 |
| C6—C1—C2—C3 | 0.4 (2) | C22—C23—C24—C25 | −175.30 (16) |
| C36—C1—C2—C3 | −178.54 (15) | C20—C19—C24—C23 | −1.3 (2) |
| C1—C2—C3—C4 | −1.7 (2) | C18—C19—C24—C23 | 179.13 (15) |
| C1—C2—C3—C37 | 175.55 (15) | C20—C19—C24—C25 | 176.40 (15) |
| C2—C3—C4—C5 | 1.8 (2) | C18—C19—C24—C25 | −3.2 (2) |
| C37—C3—C4—C5 | −175.55 (15) | C32—C27—C28—C29 | 1.5 (2) |
| C3—C4—C5—C6 | −0.6 (2) | C26—C27—C28—C29 | −176.98 (16) |
| C4—C5—C6—C1 | −0.7 (2) | C27—C28—C29—C30 | −0.2 (3) |
| C4—C5—C6—C7 | −179.51 (15) | C28—C29—C30—C31 | −0.7 (2) |
| C2—C1—C6—C5 | 0.8 (2) | C28—C29—C30—C46 | −176.65 (15) |
| C36—C1—C6—C5 | 179.77 (14) | C29—C30—C31—C32 | 0.3 (2) |
| C2—C1—C6—C7 | 179.63 (14) | C46—C30—C31—C32 | 176.14 (14) |
| C36—C1—C6—C7 | −1.4 (2) | C30—C31—C32—C27 | 1.0 (2) |
| C14—C9—C10—C11 | 2.2 (2) | C30—C31—C32—C33 | −177.81 (15) |
| C8—C9—C10—C11 | −174.65 (15) | C28—C27—C32—C31 | −1.9 (2) |
| C9—C10—C11—C12 | −1.1 (3) | C26—C27—C32—C31 | 176.64 (15) |
| C10—C11—C12—C13 | −1.1 (2) | C28—C27—C32—C33 | 176.94 (15) |
| C10—C11—C12—C40 | 178.95 (15) | C26—C27—C32—C33 | −4.5 (2) |
| C11—C12—C13—C14 | 2.1 (2) | C2—C3—C37—C39 | 14.4 (2) |
| C40—C12—C13—C14 | −177.86 (14) | C4—C3—C37—C39 | −168.35 (16) |
| C12—C13—C14—C9 | −1.0 (2) | C2—C3—C37—C38 | −110.89 (18) |
| C12—C13—C14—C15 | 177.02 (14) | C4—C3—C37—C38 | 66.3 (2) |
| C10—C9—C14—C13 | −1.2 (2) | C13—C12—C40—C42 | −115.35 (17) |
| C8—C9—C14—C13 | 175.78 (14) | C11—C12—C40—C42 | 64.6 (2) |
| C10—C9—C14—C15 | −179.21 (14) | C13—C12—C40—C41 | 9.7 (2) |
| C8—C9—C14—C15 | −2.3 (2) | C11—C12—C40—C41 | −170.28 (15) |
| C24—C19—C20—C21 | −0.8 (2) | C20—C21—C43—C44 | 10.6 (2) |
| C18—C19—C20—C21 | 178.76 (15) | C22—C21—C43—C44 | −169.67 (16) |
| C19—C20—C21—C22 | 1.8 (2) | C20—C21—C43—C45 | −114.94 (18) |
| C19—C20—C21—C43 | −178.43 (15) | C22—C21—C43—C45 | 64.8 (2) |
| C20—C21—C22—C23 | −0.8 (3) | C31—C30—C46—C47 | 36.4 (2) |
| C43—C21—C22—C23 | 179.47 (16) | C29—C30—C46—C47 | −147.78 (16) |
| C21—C22—C23—C24 | −1.3 (3) | C31—C30—C46—C48 | −87.9 (2) |
| C22—C23—C24—C19 | 2.3 (2) | C29—C30—C46—C48 | 87.9 (2) |
Experimental details
| Crystal data | |
| Chemical formula | C48H40 |
| Mr | 616.8 |
| Crystal system, space group | Monoclinic, P21/c |
| Temperature (K) | 90 |
| a, b, c (Å) | 18.0007 (4), 12.5083 (3), 16.0674 (4) |
| β (°) | 91.004 (1) |
| V (Å3) | 3617.15 (15) |
| Z | 4 |
| Radiation type | Mo Kα |
| µ (mm−1) | 0.06 |
| Crystal size (mm) | 0.45 × 0.30 × 0.30 |
| Data collection | |
| Diffractometer | Nonius KappaCCD |
| Absorption correction | Multi-scan (SCALEPACK; Otwinowski & Minor 1997) |
| Tmin, Tmax | 0.972, 0.981 |
| No. of measured, independent and observed [I > 2σ(I)] reflections | 13998, 8186, 5354 |
| Rint | 0.035 |
| (sin θ/λ)max (Å−1) | 0.680 |
| Refinement | |
| R[F2 > 2σ(F2)], wR(F2), S | 0.049, 0.127, 1.02 |
| No. of reflections | 8186 |
| No. of parameters | 442 |
| H-atom treatment | H-atom parameters constrained |
| Δρmax, Δρmin (e Å−3) | 0.25, −0.28 |
Computer programs: COLLECT (Nonius, 2000), DENZO and SCALEPACK (Otwinowski & Minor, 1997), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997), IDEAL (Gould et al., 1988) and WinGX (Farrugia, 1999).


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Alert level C
Alert level G
![[Figure 1]](http://journals.iucr.org/e/issues/2011/12/00/kj2194/kj2194fig1thm.gif)




The title compound, C48H40, is a tetraisopropyl-substituted polyannulenoenyne and its structure was determined at 90 K. The 295 K structure of the unsubstituted parent annulene, C36H16, was previously determined by Boese et al. (1997; CSD: RICVEE, Allen, 2002; CAS: 186494–87-1), and is of quasi-D2 (222) symmetry, as determined by least-squares fit (Gould et al., 1988; δr.m.s. = 0.239 Å) of all 36 common carbon atoms of the parent to a model of C36H16 optimized in D2 symmetry by molecular mechanics (Cambridgesoft, 2010). Reasonable agreements result from the same least-squares fit of the title compound (at 90 K) to the parent (δr.m.s. =0.419 Å) and to the optimized model (δr.m.s. = 0.426 Å).
The six C≡C triple bond distances are all experimentally equal, falling in the narrow range 1.203 (2) - 1.206 (2) Å, while the C–C bonds linking the triple bonds have length C16—C17 1.370 (2) and C34—C35 1.377 (2) Å. The acetylenic bridges are slightly bowed outward, with C–C≡C angles in the range 177.59 (18) - 179.17 (18)° for the butadiyne bridges and in the range 174.43 (17) - 176.80 (17)° for the acetylene bridges. Distances between the following bond centroids provide a measure of overall molecular dimensions: C16—C17 to C34—C35 = 3.341 (2) Å, C7 ≡C8 to C25 ≡C26 = 7.650 (2) Å.