The principal 2,3:4,5-diacetyal obtained by benzylidenation of ~_arabinose dietyl dithioacetal with benzaldehyde/hydrogen chloride has been assigned the R configuration at the 2,3-acetal centre following its conversion into 2,3-Q-(~)-benzyl idene-~-arabinitol. The configuration of the latter compound was established by its conversion into "trans" l,4-di-Q-benzoyl-2, 3-Q-benzylidene-erythritol by sequential periodate oxidation, epimerisation of the resulting 2,3-Q-(R)-benzylidene-~-threose to give 2,3-Q-(~)-benzylidene-~-erythrose, reduction, and benzoylation.
J W WEBBER ,M H QADIR ,
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