Rhodamine B pentyl ester and its methyl, ethyl, propyl, and butyl homologues
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The pentyl ester of rhodamine B was prepd. from the alc. and the free acid of rhodamine B using acetyl chloride which generated HCl in situ to catalyze the esterification reaction for an 85% yield. The C1-4 homolog esters were obtained in a similar fashion.
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Organic Chemical Synthesis