The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. Quality Control of 4,4′-Dibromobiphenyl, 92-86-4, Name is 4,4′-Dibromobiphenyl, SMILES is BrC1=CC=C(C2=CC=C(Br)C=C2)C=C1, in an article , author is Weng, Qiang, once mentioned of 92-86-4.
Synthesis and mesomorphic properties of benzoxazole derivatives with lateral multifluoro substituents
Fluorinated aromatics is generally chosen as mesogenic cores to design novel liquid crystal compounds. Here, a series of benzoxazole derivatives with laterally multifluorinated biphenyl units, 2-(3 ‘,3-difluoro -4 ‘-alkoxy-1,1 ‘-biphenyl-4-yl)-benzoxazole derivatives (coded as nPF(3)PF(3)Bx), are synthesized and characterized, where methyl and nitro moieties are selected as terminal groups to investigate the effects of different polar substituents on the liquid crystal properties. The compounds nPF(3)PF(3)Bx show enantiotropic mesophases with mesophase ranges of 0-40 degrees C and 0-63 degrees C on heating and cooling for hydrogen-terminated derivatives (nPF(3)PF(3)BH), 43-93 degrees C and 54-123 degrees C for methyl-terminated ones (nPF(3)PF(3)BM), 60-108 degrees C and 74-152 degrees C for nitro terminated ones (nPF(3)PF(3)BN), respectively. They exhibit photoluminescence emission peaks at 390-392 nm and UV-vis absorption bands with maxima at 327-330 nm, respectively. The results reveal that lateral multifluoro substituents lead to a decrease in melting/clearing points, while electron-withdrawing terminal nitro moiety results in increases in both melting point and mesophase range. [GRAPHICS] .
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Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem