A significant barrier to 1, 2-hydrogen migration in singlet 1-phenylethylidene. A laser flash photolysis study

MH Sugiyama, S Celebi, MS Platz

Index: Sugiyama, Michelle H.; Celebi, Sol; Platz, Matthew S. Journal of the American Chemical Society, 1992 ,  vol. 114,  # 3  p. 966 - 973

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Citation Number: 59

Abstract

Abstract: Laser flash photolysis of 1-phenyldiazoethane in heptane releases 1- phenylethylidene which can be intercepted with pyridine to form an ylide (Amx= 475 nm). Oxygen trapping experiments indicate that relaxation of singlet 1-phenylethylidene to the ground triplet state is rapid relative to pyridine trapping. Analysis of the data reveals that the (singlet/triplet) carbene equilibrium constant K= 2 X and AGsT (298 K)= 2.3 kcal/mol at ...