Hexakis benzene structure

In the early work, benzene formed the basis of a variety of multi-armed structures. Analogs bearing from 2—6 arms were prepared and compared for cation binding ability. The only indication of mode of synthesis for the hexa-substituted benzene derivative is that it was obtained on reaction of benzene-hexakis(methanethiol) and l-bromo-3,6,9-trioxatridecane . The reaction is illustrated in Eq. (7.6), below, devoid of reaction conditions and yields which were not specified. 

Coordination studies of acyclic thioether ligands to silver(I) centers has also been studied. Poly(alkylthio)aromatic systems have been used to form supramolecular silver(I) compounds. With the ligand 2,3,5,6-tetrakis(isopropylthio)benzoquinone the compound has a linear chain structure in which silver(I) has a tetrahedral coordination.1156 A similar structure has the compound with the hexakis(methylthio)benzene,1157 but with the hexakis(tolylthio)benzene the silver... 

Figure 6.10 Chiral hexakis-porphyrinato benzene compound 66, which possesses propellerlike structure and can self-assemble to form helical arrays.

In the group of Sekiguchi, the dilithiated derivatives of tetrakis- and hexakis(trimethyl-silyl)benzene 226 and 228 in Schemes 78 and 79, respectively, have been synthesized by the reaction of the parent compounds with an excess of metallic lithium in coordinating solvents at room temperature. Both molecular structures in the solid state were cleared up by X-ray structural analysis (Figures 29 and 30) . 

FIGURE 10. Molecular structure of hexakis(fluorodimethylsilyl)benzene 30 (a) top view and (b) geometry around silicon. Reprinted with permission from Reference 67, Copyright 1994 American Chemical Society... 

Irradiation of hexakis(trifluoromethyl)benzene with ultraviolet light gives three products, F, G, and H. What are their structures ... 

The cyclic polythioether complex [W(CO)4L] (L = 2,5,8,ll-tetrathia[12](2,5)thiophenophane was prepared by UV irradiation of [W(CO)6] in the presence of the ligand in thf. Variable-temperature H NMR studies showed that this species was fluxional, and the derived molecular structure indicated k -L-S S coordination (17). The thioether-bridged complexes [ W(CO)4)2T] (18), where L is the hexakis(alkylsulfanylmethyl)benzene, C6(CH2SR)6 (R = C5H11, Pr ) were obtained by reaction of [W(CO)4(NCMe)2] with the appropriate thioether. Reaction of [W(CO)4(tmpa)] (tmpa = V,iV,iV, iV -tetramethyl-l,3-propanediamine) with 1,5-diselenacyclooctane ([8]aneSe2) gave the cis-disubstituted produce [W(CO)4 [8]aneSe2 ]. 

Claramunt et al. dedicated several publications to the study of the structure of polyazolyl-benzenes (propellenes) (97M12). These compounds present several N-C bonds between five (azoles) and six-membered rings (benzenes). Besides the dihedral angles the position (up or down) of the azolyl residues are characteristic of these compounds hexa(3,5-dimethyl-pyrazol-l-yl)benzene (16, R = 3,5-dimethyl) (95JCS(P2)1359), hexakis(pyr-azol-l-yl)benzene (16, R = H) (96JPOC137, 02EJ1C3178), 1,2,4,5-tetrakis (pyrazol-l -yl)-3,6-bis(3",5"-dimethylpyrazol-l -yl)benzene (16, R = H... 

The crystal structure of squalene at -110 °C has been determined. The molecule adopts a stretched conformation which differs significantly from the conformation of squalene when included within the host molecule hexakis(p-t-butylphenylthiomethyI)benzene. ... 

Figure 19. Zig-zag chain structure and the TG curve of silver(I) complexes of hexakis(tolylsulfanyl)benzene. Reproduced from reference [213] wiA permission from Elsevier.

Hexafluorobut-2-yne adds to the 1,4-positions of the rhodiunv-acetyl-acetonate ring of acetylacetonato(cyclo-octa-l,5-diene)rhodium, and this adduct reacts with hexakis(trifluoromethyl)benzene, formed in situ, to give complex (86a), in which the cyclo-octadiene has been displaced. This structure is confirmed by single-crystal A -ray diffraction. The same product is formed from the corresponding (hexachloronorbomadiene)rhodium complex, but with acetylacetonatobis(ethylene)rhodium or the (ethylene)-(tetrafluoToethylene)rhodium complex, the cyclohexadiene complex (87), in which the one molecule of ethylene is incorporated into the co-ordinated... 

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