A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 136630-39-2, Name is 2,7-Dibromo-9H-carbazole, molecular formula is C12H7Br2N. In an article, author is Xing Guo-Xiang,once mentioned of 136630-39-2, Quality Control of 2,7-Dibromo-9H-carbazole.
Syntheses, Crystal Structures and Biological Activities of Three New Benzoxazole Derivatives Containing Pyridyl Moiety
Three novel benzoxazole derivatives based on the pyridyl group were designed and synthesized from 2-methylbenzoxazole and three different types of pyridylaldehyde. Their structures were confirmed by HRMS, H-1 NMR, C-13 NMR and IR. Among them, the crystal structures of compounds 1 and 3 were also determined by single-crystal X-ray diffraction. Compound 1 crystallizes in monoclinic system, space group P2(1/c) with a = 0.66725(4), b = 1.04750(7), c = 1.61138(10) nm, beta = 93.884(2)degrees, V = 1.12368(12) nm(3) , Z = 4, D-c = 1.314 g/cm(3), mu= 0.085 mm(-1), F(000) = 464, R = 0.0731 and wR = 0.2412. Compound 3 crystallizes in monoclinic system, P2(1)/c space group with a = 0.6585(7), b = 1.3840(7), c = 2.5364(6) nm, beta = 103.4220(4)degrees, V = 2.249(3) nm(3), Z = 8, D-c = 1.313 g/cm(3), mu = 0.085 mm(-1), F(000) = 928, R = 0.0584 and wR = 0.1151. The three compounds were screened for their antitumor activities against the human cancer HepG2 cells in vitro by MTT assay. All compounds could inhibit the proliferation of HepG2 cells, whose IC50 values are 87.7, 9.6 and 33.5 mu mol/L for compounds 1, 2 and 3, respectively. Most noticeably of all, the inhibition rate of complex 2 was up to 85% at 100 mu mol/L.
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Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem