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18. Upon introduction of the tosyl group to 3-alkyl-aziridine esters using tosyl chloride, chloride opened the N-tosyl aziridine esters to a considerable extent after prolonged stirring (2 days). On the other hand, introduction of the mesitylsulfonyl group required stirring for 2 days. This process did not cause aziridine ring opening by chloride. These findings suggest that the mesitylenesulfonyl group activates the aziridine less than the tosyl group does. This might explain the absence of aziridine ring-opened products, such as 11, in the reaction of 3d.
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