Hexaphenyl

Benzene, bromoethynyl, 46, 86 Benzene, cyclopropyl, 47, 98 Benzene, hexaphenyl, 46, 44... 

CN-PPP PLQY = 46 %,5,(film) paia-hexaphenyl PLQY = 30 % (film) mLPPP PLQY = 30 % (film)... 

From the optical absorption of two different hexaphenyl films, one with its chains predominantly standing upright on the substrate, the other with the chains randomly distributed in all orientations, similar structure property relations can be concluded [139]. By comparing the calculated absorption coefficient [139J perpendicular to the chains with the observed optical absorption spectra of both films we see that the optical absorption, plotted in Figure 9-9, in the visible and... 

Irradiation of triazafulvene 2 or 3 leads to the formation of an azacyclobutadienc intermediate which, after dimerization and two subsequent electrocyclic ring-opening reactions, gives the hexaphenyl-substituted 1.5-diazocine.48,49... 

Hexaphenyl-l,5-diazocine (4) can also be generated by irradiation of the substituted triazine 5. After initial elimination of nitrogen, the reaction proceeds by the same mechanism as the triphenyltriazafulvenes vide supra).48,49... 

Schnell und quantitativ laBt sich Triphenylcarbinol mit Vanadin(II)-chlorid in einer Aceton-Salzsaure-Losung (bei 23°/10 Min.) zu Hexaphenyl-dthan (isoliert als Peroxid) reduzieren4 Diphenylcarbinol reagiert in allerdings geringeren Ausbeuten zu 1,1,2,2-Tetraphenyl-athan. 

Trimethyl- und Triphenyl-chlor-stannan dimcrisieren in 1,2-Dimethoxy-athan/Tetrabutylammonium-perchlorat (Platinkathodc) zu Hexamethyl- bzw. Hexaphenyl-dizinn 3. 

Higher hexaphenylbenzene homologues were also prepared following a repetitive Diels-Alder procedure. The synthesis of a bis(hexaphenyl)benzene was first described by Ogliaruso et al. [55]. 

Exactly such steric repulsion seems to be responsible for the further rearrangements observed with heptaphenylborepin (109 or 114 with R = Ph). The end result of a reasonable, but amazing sequence of pericyclic reactions is 1,2,3,3a,4,5-hexaphenyl-5-bora-3a,4-dihydro-5//-benz[>]in-dene (119), whose generation is initiated with 109 and continues through 116-118 (Scheme 11). The last step, 118-119, is an impressive intramolecu-... 

You, S.-L., Razavi, H. and Kelly, J.W. (2003) A biomimetic synthesis of thiazolines using hexaphenyl-oxodipho-sphonium trifluoromethanesulfonate. Angewandte Chemie (International Edition in English), 42, 83—85. 

Present syntheses are relatively undirected, giving low yields of the characterized products and undoubtedly other interesting species in the mixture. No doubt similar compounds were among the long-known ER2 and ER species, with identifications like hexaphenyl-hexagermabenzene, formed in reductions of less bulky REX3 species. 

Benzene, bromoethynyl, 45, 86 Benzene, 3-bromopropenyl-, 48, 51 Benzene, cyclopropyl-, 47, 98 Benzene, hexaphenyl-, 46, 44 Benzenediazonium, o-carboxy-, hydroxide, inner salt, 48,12 Benzenediazonium-2-carboxylate,... 

G. Leising, S. Tasch, F. Meghdadi, L. Athouel, G. Froyer, and U. Scherf, Blue electroluminescence with ladder-type poly(p-phenylene) and p-hexaphenyl, Synth. Met., 81 185-189, 1996. 

Note on terminology Many authors write stable when they mean unreactive or inert but stable is the opposite of unstable , and the opposite of reactive is unreactive or inert . Methyl radicals are very stable, but very reactive hexaphenyl ethane is unstable, but very inert. 

The high dipole moments of triapentafulvalenes 46—6.3 D for the hexaphenyl derivative (61), 5.4 to 5.9 D estimated for the parent compound (62)—have been seen as an indication for an aromatic ground state. This contention has been... 

According to these simulations, the dendrimers based on core 10 adopt a false-propeller structure, while the dendrimers based on the hexaphenyl-benzene core 11 adopt a true-propeller type structure. The difference lies in... 

Fig. 1. Different types of mole -cuTes of hexaphenyl—carbodi— phosphorane X-ray evidence...

Die intramolekulare Wasserstoff-Abstraktion in (17) zeigt keinen Isotopeneffekt, d.h. das Produkt wurde festgelegt, bevor der Wasser-stoff-Transfer stattfindet. Die thermische Valenzisomerisierung von (18) fiihrt zu Hexaphenyl-cyclohexadien-1,4, dessen Dehydrierung Hexa,-phenylbenzol ergibt. 

Diphenylacetylene and methylphenylacetylene react with palladium halides to give a very interesting series of compounds some of which are almost certainly ir-allylicpalladium complexes. Thus diphenylacetylene (ChHjo) reacts with palladium(II) chloride in ethanol to give hexaphenyl-benzene and a complex of the composition [PdCl(Ci4Hi0)2(OC2H6)] 148, 149) which we formulate as the ir-allylic complex (XLVI) (see Section... 

The synthesis of organic molecules containing multiple redox active chromo-phores is of particular interest due to their importance not only for the preparation of materials with novel properties but also as multi-electron redox catalysis88. Hexaphenyl benzene and tetraphenylmethane have been reported as plat-... 

It can be seen from Table 1 that, for comparable systems, there is a reduction of about 5-6 pm in r(P —C) in the sp ylide relative to the sp2 ylide. However, the distances reported for most sp ylides are still within the low end of the range reported for sp2 ylides. Note that in hexamethylcarbodiphosphorane r(P=C) is significantly less than in the hexaphenyl derivative, consistent with the same observation for the sp2 analogues. The shorter P=C distance may be a steric effect in that the sterically less encumbered carbanion can approach closer to the phosphorus atom. 

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