Toward organic synthesis of a magnetic particle: dendritic polyradicals with 15 and 31 centers for unpaired electrons was written by Rajca, Andrzej;Utamapanya, Suchada. And the article was included in Journal of the American Chemical Society in 1993.SDS of cas: 151859-37-9 The following contents are mentioned in the article:
Starting from a bromo triether derivative (I), the authors prepared a homologous pentadecaether, which is a precursor for the title pentadecaradical, by repeating twice the following two-step procedure (total of four steps): (1) Br/Li exchange followed by the addition of the organolithium to a benzoic acid ester derivative and (2) conversion of the triarylmethyl alc. to Me ether. Similarly, a 31-ether precursor was prepared by repeating three times the above sequence (total of six steps). The polyethers were converted with Li metal in THF to the corresponding carbopolyanions and, subsequently, oxidized with iodine at 180 K to give the polyradicals. The polyradicals were studied in frozen THF and 2-methyltetrahydrofuran solutions by SQUID magnetometry in the 2-80 K temperature range and the 0-5.5 T magnetic field range; spin values, which are lower than expected for strong ferromagnetic coupling, were obtained. One of the possible explanations is the presence of defects, which disrupt ferromagnetic coupling between the triarylmethyl sites in these single-path π-conjugated systems; relationship of the current work to the percolation problem is discussed. This study involved multiple reactions and reactants, such as Methyl 3-bromo-2,4-dimethylbenzoate (cas: 151859-37-9SDS of cas: 151859-37-9).
Methyl 3-bromo-2,4-dimethylbenzoate (cas: 151859-37-9) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. SDS of cas: 151859-37-9
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary