Oligo aryls

Wang Y, Li F, Han Y, Wang F, Jiang H (2009) Folding and aggregation of cationic Oligo (aryl-triazole)s in aqueous solution. Chem Eur J 15 9424—9433... 

Isocyanide is isoelectronic with CO and a reactive compound in the presence of Pd catalysts. The heterobicyclic compound 127 is obtained by the successive insertion of 2.6-xylyl isocyanide (126) into the Pd-hydride bond formed from the hydrosilane[121. Aryl isocyanide inserts into the Si—Si bond in oligo-silanes. For example, 3 mol of 2,6-xylyl isocyanide insert into the tetrasilane 128 to give 129[122],... 

The first series of soluble oligo(/ ara-phenylene)s OPVs 24 were generated by Kern and Wirth [48] and shortly after by Heitz and Ulrich [49]. They introduced alkyl substituents (methyls) in each repeat unit and synthesized oligomers 24 up to the hexamer. Various synthetic methods, like the copper-catalyzed Ullmann coupling, the copper-catalyzed condensation of lithium aryls, and the twofold addition of organomelallic species to cyclohexane-1,4-dione, have been thereby investigated. 

More recently, Mullen et al. have worked out very efficient procedures to generate highly arylaled, branched oligo(phcnylcne) and related oligo(arylcne) derivatives following different synthetic approaches. 

Polymeric (isocyanide)gold(i) aryls ( gold oligo-phenylene-ethynylene-isonitriles ) were tested as electrical conductors at metal-molecule-metal junctions (7r-conjugated molecular wires), but the preparation, structure, and properties of the materials were not fully disclosed (Scheme 52).218... 

Fig. 55. Linear oligo-L-lysine bearing aryl mannosides (503) and the quinic acid bioisostere of mannose (504).367,368...

Abstract This review describes recent results in the field of poly(aryleneethynylene)s (PAEs) that contain metal ions in the polymer backbone, or in the polymer side chain. This work is focused primarily on polymers possessing ligands of metal complexes as part of the aryle-neethynylene chain. PAEs with porphyrinylene in the backbone have also been addressed. Synthetic routes toward the polymers, as well as their photochemical, photophysical, and electrochemical properties, are presented. Monodisperse oligo(phenyleneethynylene)s with terminal metal complexes or with a ferrocene and thiol at each end are mentioned. 

Oxidative polymerization of aryl disulfides has been carried out under high dilution conditions for the preparation of cyclic arylene sulfides for synthesizing cyclic arylene sulfide polymers. The readily available diphenyl disulfide and dichloro disulfide with diphenyl sulfide, diphenyl ether, or p-xylene are useful monomers for the synthesis of the corresponding cyclic oligo(thio arylene)s. The reaction scheme is shown in Fig. 30 [101]. 

Title Mono-, Oligo- and Polymers Comprising Fluorene and Aryl Groups... 

Hartwig has reported a DPPF/Pd-catalyzed C-N coupling reaction between a diarylamine and an aryl nonaflate, Eq. (63) [64bj. The coupling below proceeded in 95 -100% yield (NMR) and was used in a strategy to prepare oligo(m-aniline) compounds. 

The ylide nickel-catalyzed oligo-/polymerization of ethylene in the presence of styrene or substituted styrenes with unpolar or polar substituents results predominantly in styrene-terminated ohgo-/polyethylenes. Usually, no styrene homopolymerization takes place. The ethylene pressure has to be adjusted relative to the styrene concentration to reduce the competing formation of simple a-olefms. High styrene concentration and low ethylene pressure favor homologous series of the composition aryl-C ,H2, . While the aryl group is frequently located at one... 

In attempts to prepare oligo- and poly(aryl/heteroaryl) systems, the use of 2,5-dibro-mopyrimidine 81 was required in a sequential fashion. Treating 81 with three equivalents of benzene boronic acid in the presence of catalytic Pd(PPh3)4 in refluxing THF, gave only two isolable products. The mono-Suzuki product 83 resulting from reaction at the 2-position was obtained in 43% yield and the bis-Suzuki product 84 was obtained in 32% yield. The results of this reaction establish that the bromine at the 2-position is more reactive than the bromine at the 5-position [34]. 

Linker 88 has been successfully employed in the synthesis of a small hbrary of benzopyranones, of which the individual compounds were obtained in high yields and purities [101]. A further application of the linker has been in the synthesis of oligo(3-aryl-thiophenes) [102]. 

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