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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.

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