DOI:
10.1055/s-00000083
Synlett
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General Procedure for the Oxidation of the leuco-FormA solution of leuco-form 5a or 5b (5.00 μmol) in CH2Cl2 (2.0 mL) was treated at RT with an excess of chloranil and the mixture stirred until the red color persisted. The mixture was washed with water (2.0 mL) and 1 M HBr (2 x 1.0 mL). The organic layer was dried over Na2SO4 and concentrated in vacuo. The residue was purified by chromatography over silica gel with 100% CH2Cl2 and CH2Cl2/MeOH (100:5) to provide acridinium bromide salt 4a or 4b: Sakabe M. Asanuma D. Kamiya M. Iwatate RJ. Hanaoka K. Terai T. Nagano T. Urano Y.
J. Am. Chem. Soc. 2013;
135: 409
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