1.2.3.4.5.6- Hexakis derivatives

NMR and electronic spectra, and electrochemical behavior has recently appeared. The protonated hexakis-derivative [Mo60i3(NAr)6H] has also been prepared and stmcturally characterized. The bis-, tris-, and tetrakis-(NAr) hexamolybdate derivatives 2-Ar, 3-Ar, and 4-Ar adopt cis-, fac-, and cis- structures, respectively (Figure 3) rather than the presumably less crowded trans-, mer-, and trans- alternatives, suggesting that the presence... 

The reaction of the chenodeojycholic acid derivative (3-methyl-4-(3-aminohexadecahydro-7-hydroxy,10,13-dimethyl-li -cyclopentaphenan-threnyl) pentanoate with N3P3CI6 afforded the hexakis derivative (75) which was characterized hy multinuclear NMR and mass spectroscopy. ... 

Hexakis derivatives of cyclophosphazenes containing terminal phenol units (79) have been prepared (Scheme 13). Such compounds (79) are believed to have potential uses in polymer hybrid composites. ... 

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. 

Perfluorotetramethylthiadiphosphanorbornadiene and bis(trifluoromethyl) thiadiphosphole can be prepared by thermolysis of an adduct of methanol and hexakis(trifluoromethyl)-l,4-diphosphabarrelene with sulfur [113] (equation 23) Pyrolysis of the adduct of hexafluorinated Dewar benzene and phenyl azide results in ring expansion giving azepine, which photochemically yields an intramolecular 2-1-2 adduct, a good dienophile for the Diels-Alder reaction [114, //5] (equation 24) Thermolysis of fluonnated derivatives of 1,5-diazabicyclo-... 

When uradiated, fluonnated isomers of Dewar benzene yield pnsmane derivatives that rearrange thermally to benzene Photolysis of hexakis(mfluororaethyl)benzvalene ozonide gives tetrakis(tnfluoromethyl)cyclobutadiene and its dimer [J47]... 

Derivatives with the same substitution pattern on each residue can be named semisystematically by assigning a single multiplicative prefix (e.g. hexakis, hep-takis etc.) to the substituent prefixes as a group. 

Hexa(oligophenyl)benzenes (e. g. 31 or 33) present one possible approach to the realization of this aim. Two efficient synthetic routes have been elaborated for the preparation of hexa(terphenyl)- and hexa(quaterphenyl)benzene. The first, involving palladium-catalyzed trimerization of diarylacetylenes [54] as the key step, was demonstrated by the synthesis of a hexakis-alkylated hexa(terphenyl)benzene derivative 31 from the corresponding bis(terphenyl) acetylene (32). The peripheral tert-alkyl substituents serve to solubilize the molecule. 

All the hexakis(ligand) Fe(II) materials derived from isoxazole, 1-alkyl-tetrazole and 4-R-1,2,4-triazole exhibit very favourable Fe(II) spin crossover response functions, which make them the likely compounds of choice for various applications in molecular electronics. The interconversion from low-spin... 

Dialkyl phosphoramidates react with sulphonyl di-isocyanate to give the phos-phorylated thiatriazine dioxide derivatives (33),28 while TMPT and formaldehyde together afford l,5-dioxo-2,4,6,8,9,ll-hexakis(methylamino)-l,5-diphosphabicyclo-[3,3,3]undecane (34).28... 

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 10.12 Complete series of octahedral addition patterns in hexakis-adducts of with one or two different types of addends and their precursor adducts type I adducts are derived from precursors obtained from successive e-additions, type II adducts from precursors synthesized by other means.

Ortiz AL, Echegoyen L (2010) Unexpected and selective formation of an (e, e, e, e)-tetrakis-[60]fullerene derivative via electrolytic retro-cyclopropanation of a D2h-hexakis-[60]fuller-ene adduct. J Mater Chem 21 1362-1364... 

IV,N,N -Tris(trimethylsilyl)amidines have been used recently as precursors for a number of inorganic heterocycles and metallacycles,1 some of which are being studied in light of their unusual solid state properties2. Boere et al. reported the synthesis of several aryl-substituted persilylated benzamidines and the related compound /V,N,N, N",N",Ar" -hexakis(trimethylsilyl)-l,4-benezenedicarboximidamide (hereafter referred to as HBDA) 3 the present syntheses, which are generally based on the same reaction of an aryl-substituted carbonitrile with lithium bis(trimethylsilyl)amide, offer more facile routes to representative mono- and polyfunctional carboximidamides (i.e., amidines) as well as the prototypal derivative N,N,N -tris(trimethyl-silyl)formimidamide.4 As before, the crystalline diethyl ether adduct of lithium bis(trimethylsilyl)amide5 is favored over the nonsolvated amide in these syntheses the preparation of the diethyl ether adduct is also described here. 

There are also no experimental thermochemical studies113 of prismane (57), per se, but measurements of the enthalpy of isomerization of its hexamethyl derivative to hexam-ethylbenzene have been reported114. These experimentally measured isomerization enthalpies differ by some 40 kJ moT1. There are also measurements of the isomerization enthalpy for hexakis(trifluoromethyl)prismane to the corresponding benzene115. 

For the synthesis of hexasilaprismane, tetrachlorodisilane (RSiCl2—SiC R) and trichlorosilane (RSiCb) are utilized as the starting compounds. The Mg/MgBr2 reagent is quite useful also for the synthesis of hexasilaprismane. A hexasilaprismane derivative, hexakis(2,6-diisopropylphenyl)tetracyclo[2.2.0.02 6.03 5]hexasilane (12), was successfully... 

The aminofunctional cyclotrisilane derivative hexakis[2-(dimethylaminomethyl)phenyl] cyclotrisilane can be formed by the reductive dechlorination of the corresponding dichloride Ar2SiCl2 (Ar = 2-Me2NCH2C6H4) with magnesium41. 

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