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(A) Preparative reaction of diazirine 12 with the cycloalkyne BCN to produce cycloadduct 23 is proposed to occur by [3 + 2] cycloaddition with intermediate diazo compound 21, which (B) influence formation of intramolecular products by decreasing the yield and level of D-incorporation for alkenes 13–15, and (C) on intermolecular chemistry by decreasing the yield of product 17. (D) Effect of product formation by dipolarophiles BCN and fumaronitrile.
