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Substrate Scope of Carbodiimide (3 + 2) Cycloaddition.
Conditions: cyclopropane 1 (0.4 mmol), carbodiimide (0.44 equiv), tin(II) triflate (0.44 mmol), CH2Cl2 (1.3 mL). a Isolated yields. b Bis(trimethylsilyl)carbodiimide is used as the dipolarophile.
