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Attempts of purifying 4 by flash column chromatography failed, even when anhydrous toluene was used as eluent, extensive decomposition of 4 leading to useless mixtures. Though 4 can be vacuum distilled, since 3 is considerably less reactive than 4, for most purposes it may be more convenient to use the crude product and purify at a later stage. 3¡¢4·Ö±ðÊÇÔÁϺͲúÎï |
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