Abstract
Abstract[11C]Paraquat was synthesized by the reaction of [11C]methyl triflate with the mono‐triflate salt of 1‐methyl‐[4,4′]bipyridinyl. The product was selectively separated from the precursor by a microcolumn of Chelex 100 ion exchange resin. The method was applied to the synthesis of a variety of [N‐methyl‐11C]bisquaternary ammonium compounds. This is the first reported use of a chelating cation exchange resin for the selective purification of organic dications. Copyright © 2002 John Wiley & Sons, Ltd.
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