Web5418 J. Org. Chem. 1996, 61, 5418-5424 Stereoselective Synthesis of (-)-r-Kainic Acid and (+)-r-Allokainic Acid via Trimethylstannyl-Mediated Radical Carbocyclization and Oxidative Destannylation Stephen Hanessian* and Sacha Ninkovic Department of Chemistry, Universite´ de Montre´ al, P.O. Box 6128, Station Centre-ville, Montre´ al P.Q., Canada, H3C … Web3 Sep 2014 · A 10 mL of beverages samples was transferred to a 250-mL conical flask, and 10 mL of nitric acid (65 % (w/w),, Merck) and 5 mL of hydrogen peroxide (35 % (w/w), Sigma) (2:1, v/v) were added. The mixture was then carefully heated about at 80 °C on the hotplate. Afterwards, the mixture was cooled and filtered via membrane filter of 0.45 μm.

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