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Diaryls biphenylyl

The following diaryl ditelluride can be prepared in the same maimer as in the foregoing procedure Ar=2-pyridyl, Ph and (halogen and Me) derivatives, p-(Me2N)CgH4, 1-naph-thyl, 4-biphenylyl (50-84%). [Pg.41]

Nolan reported the use of the 2,6-diisopropylphenyl imidazolium carbene precursor, which contains an unsaturated backbone, for the reaction of aryl chlorides with a variety of amines at 100 °C [165, 166]. This temperature is lower than those conventionally used for reactions of aryl chlorides, but is higher than those used with P(tBu)3 or the 2-biphenylyl di-tert-butylphosphines. Reaction yields were high when 2 mol % palladium was used. Reactions of primary amines occurred in good yield, even when unhindered aryl halides were used. The monoarylamine was obtained in 86 % yield, and only a 5 % yield of the diaryl-amine by-product was isolated. Notably, reactions of both aryl bromides and iodides proceeded at room temperature. [Pg.124]

Diaryl-l,3,4-oxadiazoles, particularly those containing 4-biphenylyl or 1-naphthyl substituents, have been described for use as liquid and plastic scintillators for the measure-... [Pg.445]

The possibility of preparing aryl tellurium halides from equimolar amounts of diaryl ditellurium compounds and aryl tellurium trihalides has hardly been explored. Only phenyl tellurium iodide and 2-biphenylyl tellurium bromide could be obtained by this route. The other aryl tellurium halides (including 3,4-dimethoxyphenyl tellurium chloride) decomposed under the reaction conditions to give diaryl tellurium dihalides and tellurium5. [Pg.241]

Diaryl-l,3,4-oxadiazoles exhibit strong fluorescence in solution on stimulation by UV or /3-irradiation, particularly 2-biphenylyl-5-phenyl- and 2-biphenyl-5-(l-naphthyl)-l,3,4-oxadiazole (cf. Section V). The quantum yield of the 1,3,4-oxadiazoles is lower than with p-terphenyl and its analogs.163-155 The band intensity with unsubstituted aryl-1,3,4-oxadiazoles and aromatic substituted oxadia-zoles is essentially the same.155... [Pg.219]

Inclusion complexes have also been shown to aid excimer formation provided that the cavity dimensions and polarity are appropriate. Thus Ueno et al. (1980) have shown that the lipophilic cavity of y-cyclodextrin can accommodate two molecules of sodium (l-naphthyl)methyl acetate and that this leads to enhanced excimer emission. Excimer formation by diaryl-methylammonium salts is promoted by y-cyclodextrin but not by a- and P-cyclodextrins (Emert et al., 1981a). The best results were obtained with compounds having fairly large aryl groups e.g. 4-biphenylyl and 1-naphthyl. The hydrophobic character of these groups helped to solubilise the compounds in the interior of the cyclodextrin. [Pg.4]

A 2 1 ratio of 2-lithiobiphenyl and diaryl or dialkylchloroborane, when pyrolyzed, gives lithium bis(2,2 -biphenylyl)spiroboranate (LXVIII) (43). [Pg.296]


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