Abstract
Contrary to previous literature reports, the reactivity of the 2′ carboxylic acid in rhodamine dyes was found to be much more reactive than anticipated. Typically, the 4′- or 5′-carboxy functionality in dicaboxyrhodamines is targeted for bioconjugation use due to the supposed unreactivity of the 2′ carboxylic acid. Reactive esters of 2′-carboxyrhodamine dyes lacking the 4′(5′)-carboxy substitutions permit a simplified synthesis of single isomer dyes but possess similar reactivities useful for labeling studies.
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