Terphenyl compounds

To our knowledge, the crystal structure of only one mesogenic terphenyl compound has been described in the literature up to now [81]. The chemical... 

After the halide starting materials themselves, the alkali metal salts are the most important terphenyl compounds. This is a result of their widespread and almost exclusive use as transfer agents for terphenyl ligands. They can be synthesized by the simple reaction of n-BuLi with the halide (usually bromide or iodide). This general reaction,... 

This section focuses on the heavier element group 14 terphenyl compounds. However, some carbon derivatives that have obvious synthetic importance are also described briefly. 

Low-temperature-dehydrogenation techniques have been described. Biphenyl and terphenyl compounds have been made by dehydrogenations... 

Terphenyl compounds have been put forward as bearing a scaffold capable of mimicking one face of ot-helical peptides [36]. The side chains in the designed terphenyl compounds are projected in a similar way to i, i + 4, and i + 7 residues in a-helical peptides. Since the interaction between p53 and MDM2 is mediated by a short a-helix from p53, it was expected that certain terphenyl compounds may also bind to MDM2. A FP-based competitive binding assay was used to evaluate the... 

In many cases, similar routes can be used to prepare biphenyl and terphenyl compounds analogous to the benzene compounds shown. 

Cu2(C02)4 paddle-wheel units show good H2 sorption capacities of 2.59, 2.52, and 2.24 wt% at 78 K (Ibar). Interestingly, the quaterphenyl compound has the lowest H2 adsorption despite having the largest pore size and pore surface area. The saturated H2 sorption of this compound at 20 bar is almost same as the H2 sorption of terphenyl compound with smaller pore volume and pore surface (terphenyl compound 6.06% quaterphenyl compound 6.07%). When we aim to achieve H2 sorption at ambient conditions, a key factor is an affinity for H2 molecules, but not big pores nor high porosity. 

Liquid crystalline compounds are not very dangerous and only basic precautions should be used in handling them. They are not poisonous or carcinogenic, and do not cause problems when in contact with skin (see also Biphenyls and terphenyls Cinnamic acid Stilbene dyes). 

Two independent routes to magnesium amidinates containing very bulky terphenyl substituents have been developed, yielding both mono- and bis(amidinate) magnesium complexes. As shown in Scheme 17, the free amidine reacted cleanly with 0.5 equivalents of dibutylmagnesium in toluene to form the bis (amidinate) in moderate yield. The highly soluble compounds was recrystallized from hexanes as clear, colorless crystalline blocks. ... 

Structure of 4-cyano-4 -n-pentyl-p-terphenyl (T15) is shown in Fig. 12. This compound, first prepared by Gray et al. [82], exhibits a nematic phase with a wide temperature range. 

Prior to 1995 no such inorganic compound, save perhaps for borazine, could boast of aromaticity. The utilization of m-terphenyl sterically demanding ligands in organogallium chemistry would change this forever. 

Scheme 13 Attempted synthesis of phosphaquinoid compounds carrying m-terphenyl ligand [13]...

Schnaak et al. [4] Polychlorinated terphenyls, naphthalenes, chloropesticides, halogenated hydrocarbon solvents, aromatic hydrocarbon solvents (BTEX), chlorobenzenes, poly aromatic hydrocarbons (EPA 610), phenols, chlorophenols, phthalates, petroleum hydrocarbons, LAS and nonylphenol (NP), organotin compounds and 2,4-dichloroaniline 1 pg/kg to 10 mg/kg for chlorine-contained compounds 10 pg/kg to 1 g/kg for solvent and phenols 1 mg/kg to 10 g/kg for EPA610, DEHP, LAS, and mineral oils Sewage sludge... 

Apart from the parent compound 1 and its very simple alkyl derivatives, 1,3,4-oxadiazoles are solids. Solid oxadiazoles containing biphenyl or triphenyl substituents exhibit interesting properties upon heating. The symmetric 2,5-bisbiphenyl-4-yl-l,3,4-oxadiazole 38 melts into an isotropic phase showing small monotropic mesophase. By contrast, the asymmetric (hockey stick-shaped) mesogen 2-terphenyl-4-yl-5-phenyl-l,3,4-oxadiazole 39 exhibits a more stable enantiotropic liquid crystalline phase (a smectic phase as well as a nematic phase) <2001PCB8845>. 

Parent compounds are 1, l -biphenyl, and various terphenyls. Position numbers on the different rings are distinguished by use of primes, as for polycycloalkyls. 

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