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Quadrannulene: a Nonclassical Fullerene Fragment** Bharat, Radha Bhola, Thomas Bally, Alessandro Valente, Michał K

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Quadrannulene: a Nonclassical Fullerene Fragment** Bharat, Radha Bhola, Thomas Bally, Alessandro Valente, Michał K Published in "Angewandte Chemie International Edition 49(2): 399-402, 2010" which should be cited to refer to this work. Quadrannulene: A Nonclassical Fullerene Fragment** Bharat, Radha Bhola, Thomas Bally, Alessandro Valente, Michał K. Cyran´ski, Łukasz Dobrzycki, Stephen M. Spain, Paweł Rempała, Matthew R. Chin, and Benjamin T. King* The presence of nonhexagonal rings in an otherwise graphitic zoquadrannulene, abbreviated TMS4-TBQ. The IUPAC name lattice induces curvature. Pentagons are common—twelve and atom numbering are given in the Supporting Information. pentagons surrounded by hexagons make up C60. Larger rings Our unoptimized five-step synthesis (Scheme1) provides are present in Stone–Wales defects, and the polyhedral TMS4-TBQ in very low yield. Hopf and co-workers recently formula of Euler mandates their existence in carbon nano- summarized two synthetic strategies to the quadrannulene tube Y-junctions.[1] Except for a single, partially saturated core:[8] making the four-membered ring from [2,2]-paracyclo- example,[2] four-membered rings in graphitic structures are, however, unknown. The smallest examples of these graphitic structures are the [n]circulenes, wherein a central n-sided polygon is surrounded by n-fused benzenoid rings.[3] [7]Cir- culene, first prepared by Yamamoto, Nakazaki, and co- workers in 1983, is saddle shaped.[4] [6]Circulene, or coronene, is the trivial, planar case, and it was first synthesized by Scholl and Meyer in 1932[5] but also occurs naturally. [5]Circulene, or corannulene, comprises 1/3 of the C60 skeleton and has been intensely studied,[6] and it was first prepared by Lawton and Barth in 1971.[7] Whereas a few pioneering attempts have been reported,[8] [4]circulene has never been synthesized before. We report herein the preparation and characterization of a stable [4]circulene. By analogy with Lawtons naming of corannulene (Latin: cor, heart; annula, ring),[7] we suggest the trivial name quadrannulene (Latin: quadra, square; annula, Scheme 1. Synthesis of TMS4-TBQ. Reaction conditions: a) trimethyl- ring) for the [4]circulene parent. Hence, we name this À 8 8 silylacetylene, BuLi, CeCl3, THF, 78 Cto25 C; b) 1. TsOH, toluene, derivative 1,8,9,16-tetrakis(trimethylsilyl)tetra-cata-tetraben- 8 reflux, 2. KOH, MeOH, 25 C; c) 1. CpCo(CH2CH2)2, bis(trimethylsilyl)- 8 = acetylene, DME, 25 C, 2. Cp2FePF6. DME 1,2-dimethoxyethane, http://doc.rero.ch TMS= trimethylsilyl. Full experimental procedures can be found in the [*] Bharat, R. Bhola, Dr. S. M. Spain, Dr. P. Rempała, M. R. Chin, Supporting Information. Prof. B. T. King Department of Chemistry, University of Nevada, Reno Reno, NV 89503 (USA) Fax : (+ 1)775-784-6804 E-mail: [email protected] phanes (e.g., by aryne dimerization), or bridging substituents Prof. T. Bally, A. Valente adjacent to the four-membered ring (positions 1,8 and 4,5) of Department of Chemistry, University of Fribourg (Switzerland) a biphenylene core. We used the latter approach, which has Prof. Dr. M. K. Cyran´ski, Dr. Ł. Dobrzycki the advantage that the strain associated with the four- Faculty of Chemistry, University of Warsaw (Poland) membered ring is introduced early. Bridges were introduced Dr. Ł. Dobrzycki by cyclotrimerization, a reaction that is widely used to make Fakultt fr Anorganische Chemie strained rings, as in biphenylenes from the group of Voll- Universitt Duisburg-Essen (Germany) hardt,[9] indenocorrannulenes from the group of Siegel,[10] and [**] This work was supported by the USA NSF (CHE-0449740, CHE- helicenes from the group of Stary´.[11] 0552816) and NASA. T.B. and A.V. acknowledge support from the Cyclotrimerization offers several advantages over other Swiss NSF (2000020-121747). L.D. acknowledges the FNP for the bridging reactions. The newly bonded atoms are in the correct Kolumb stipend. M.K.C. acknowledges Dr. Madura for her assis- sp2 hybridization. Two benzenoid rings are formed with each tance and the Interdisciplinary Center for Mathematical and Computational Modeling (Warsaw, Poland) for computational new bridge, and this provides ample energy to bend the facilities. B.T.K. thanks Prof. R. Haddon for sharing his POAV molecule into its cup shape. Both bridging steps are calculated programs. (see the Supporting Information) to be more exothermic (first, À125 kcalmolÀ1; second, À132 kcalmolÀ1) than the cyclotrimerization of 1,2-diethynylbenzene and acetylene into 1 biphenylene (À107 kcalmolÀ1), a reaction that works well. The com- parison of exothermicities sug- gested that our cyclotrimerization approach was worth pursuing. Cyclotrimerization is not, how- ever, ideal. Two arene rings are necessarily ortho fused to the quadrannulene core, precluding preparation of the parent quadran- nulene. But we reasoned that these appended rings might also offer an advantage; they could protect the otherwise strained olefin bridges from unwanted reactions. We decided to extend this protection to all four of the rim olefins and therefore directed our efforts towards TBQ. This approach also simplified the preparation of the tetraalkyne precursor 3, which was synthesized from the naphthoquinone photodi- mer[12] 1 in three steps (Scheme 1). Alkynylation, which required Ce salts to suppress unwanted enoli- zation,[13] afforded tetraol 2. Elim- ination and desilylation gave 3.We Figure 1. a) Thermal ellipsoid plot of the dominant contributor of TMS -TBQ crystal (methyl groups choose bis(trimethylsilyl)acetylene 4 and H atoms omitted for clarity) b) Calculated geometry of TBQ (bold type and lines, bond lengths/ as the third cyclotrimerization ; regular type and arcs, angles; italic type and dashed lines, dihedral angles of contiguous bonds) component because the resulting c) Disorder in the TMS4-TBQ crystal. The darker shade denotes the residue with higher occupancy. TMS substituents would improve d) The crystal packing, shaded as in C. solubility, provide a convenient handle for subsequent chemistry, and facilitate NMR analysis by lowering symmetry. Jonass p stacking or other prominent intermolecular contacts. Two [14] = catalyst, CpCo(CH2 CH2)2, with bis(trimethylsilyl)acety- TMS groups from one side of the molecule fill the bowl of lene afforded the product as a yet-uncharacterized CoCp another molecule (Figure 1d). The two TMS groups from the http://doc.rero.ch + complex of TMS4-TBQ. Oxidation using Cp2Fe liberated, on other side are less constrained, and this freedom may milligram scale, TMS4-TBQ. contribute to the disorder. Because refinement of the crystal The structure of TMS4-TBQ follows from single-crystal structure required several constraints to model disorder, some X-ray diffraction analysis, mass spectrometry, 1H and geometrical parameters could not be independently refined. 13C NMR spectroscopy, and UV/Vis spectrophotometry. 1H For this reason, we discuss measurements from the geometry and 13C chemical shifts match those predicted by DFT calculated at the B3LYP/6-311G** level of theory, which is calculations[15] (see the Supporting Information). 13C, known to provide reliable geometries for many aromatic HMQC, HMBC, and COSY spectra (see the Supporting compounds.[18] Nonetheless, the diffraction data agree with Information) permit full assignment of all 1H and 13C the calculated (DFT) geometry and hence prove the structure resonances and establish symmetry and connectivity. The of TMS4-TBQ. central C atoms are more shielded (d = 145.5 ppm) than other The TMS groups only slightly affect the TBQ framework. pyramidalized but nonconjugated olefin C atoms (ca. d = The substituted and unsubstituted distal rings, C, are similar 160–210 ppm).[16] A strong through-space interaction (NOE) except that the bonds bearing pairs of bulky TMS groups are of the abutting H atoms (located in the cove region) stretched (1.43 ) relative to their unsubstituted counterparts À establishes their proximity (Figure 1a). (1.39 ). The C C bond lengths in TMS4-TBQ range from Single-crystal X-ray diffraction analysis[17] shows that 1.36 to a high of 1.48 and are consistent with calculated TMS4-TBQ crystallizes without solvent in the chiral P212121 bond orders, as discussed below. space group (Figure 1). The asymmetric unit contains a single The bond angles range from a low of 908 in the four- molecule disordered over two orientations (occupancy membered ring to a high of 1318. These angles can be 0.6:0.4) are rotated (ca. 88) about an axis parallel to the transformed into different measures of pyramidalization. We pseudo fourfold axis of their central ring (Figure 1c). The have chosen here that popularized by Haddon, which is based disorder originates from the crystal packing, with no evident on the p-orbital axis vector, that is, the vector that “makes 2 equal angles (qsp) to the three s bonds at a conjugated carbon [19] atom”. The angle qsp , which varies from 908 for a planar to 109.478 for a tetrahedral C atom, directly reflects pyramida- lization.[19b] By this token, the central four C atoms are highly pyramidalized: qsp = 1078. qsp is also related to the degree of hybridization, which is deduced to be sp2.69 for the four central C atoms of TBQ. This distortion makes TMS4-TBQ one of the most highly pyramidalized olefins that has been structurally characterized (for example, 9,9’,10,10’-tetradehydrodianthra- 2.36 [20] cene, qsp = 1038, average hybridization sp ). The bowl depth, defined as the distance between the plane of ring A (for notation, see Figure 1a) and the plane of the eight C atoms shared by rings B and C, of TMS4-TBQ is 1.36 (as a reference: corannulene, 0.87 ).[21] In corannu- lenes, this depth is related to the bowl inversion barrier.[21] Hopf has calculated the bowl inversion barrier of quadran- nulene to be 120 kcalmolÀ1[8] (as a reference: corannulene, 11 kcalmolÀ1).[21] Like corannulene,[22] TBQ is a radialene,[23] a molecule in which double bonds emanate from all vertices of a ring. Figure 2.
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