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It is well established that acylazides undergo Curtius rearrangement with retention of stereochemistry. Although the acylazide is somewhat sensitive to epimerization, Lebel has shown that the azidation/Curtius/trapping sequence proceeds with predominant retention of enantioselectivity; see; Lebel, H.; Leogane, O.; Huard, K.; Lectard, S. Pure Appl. Chem. 2006, 78, 363.
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2 provide similar selectivity to that of ether and benzene, but with decreased yields. Acetonitrile provides only a minor amount of the desired product.
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2 provide similar selectivity to that of ether and benzene, but with decreased yields. Acetonitrile provides only a minor amount of the desired product.
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