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The purpose of this investigation has been to study the benzoylation of certain syn, and anti aldoximes in the presence of bases. Earlier in-vestigators2 have shown that anti aldoximes (II), as well as syn aldoximes (I), react with benzoyl chloride in the presence of aqueous alkali to give benzoyl syn derivatives (III), instead of the expected anti derivatives (IV) or nitriles. They reported2 also that anti aldoximes give syn derivatives when the reaction with benzoyl chloride is carried out in pyridine solution, in spite of precautions to avoid isomeric change.