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The stability of the bicyclic aziridines is dependent upon their purity and the identity of the aziridine. Aziridine 20 for example begins to decompose after 5-7 days in the freezer. However, a related bicyclic aziridine in which the TBDPS group is replaced with a trityl group is stable at room temperature for several weeks.
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14b CAUTION: Azides are potentially explosive, especially upon heating. While we have observed no problems with stability or formation of the azido-formates, care should be exercised.
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