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- W2004752401 abstract "Bromination of bis(3,4-dimethoxyphenyl)methanone (5) gave four products (6-9) with mono, di, tri, and tetra Br under different conditions. Reduction and demethylation reactions of product 9 with tetra Br were performed, consecutively and a natural product, 5,5'-methylene bis(3,4-dibrombenzene-1,2-diol) (1), was obtained with a 53% yield. Five derivatives, (13-17) (bromophenols), of 1 were also synthesised. The antioxidant and radical scavenging activities of bromophenols 1 and 13-17 were determined by employing various in vitro assays such as 1,1-diphenyl-2-picryl-hydrazyl free radical (DPPH(*)), 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid (ABTS(*+)), N,N-dimethyl-p-phenylenediamine dihydrochloride radical cation (DMPD(*+)), and superoxide anion radical (O(2)(*-)) scavenging, reducing ability determination by the Fe(3+)-Fe(2+) and Cu(2+)-Cu(+) cupric reducing antioxidant capacity (CUPRAC) transformation methods, hydrogen peroxide scavenging, and ferrous ion (Fe(2+)) chelating activities. Moreover, these activities were compared to those of synthetic standard antioxidant compounds such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), alpha-tocopherol, and trolox. The results showed that the synthesised bromophenols had effective antioxidant power." @default.
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- W2004752401 date "2010-01-30" @default.
- W2004752401 modified "2023-10-07" @default.
- W2004752401 title "Synthesis and antioxidant properties of diphenylmethane derivative bromophenols including a natural product" @default.
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- W2004752401 doi "https://doi.org/10.3109/14756360903514164" @default.
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