DANIEL E. FALVEY, PhD, is Professor at the University of Maryland. His research focuses on reaction mechanisms and reactive intermediates, with an emphasis on the exploration of intermediates that play a role in biochemical processes. Dr. Falvey has been awarded the Merck Award and the Reynold C. Fuson Memorial Award in Chemistry. Acclaimed for his teaching abilities, he has received the Outstanding Teacher Award from the Center for Teaching Excellence.ANNA D. GUDMUNDSDOTTIR, PhD, is Professor of Chemistry at the University of Cincinnati. Dr. Gudmundsdottir's studies photo-removeable protecting groups, reactive intermediates, and polymer modification. Her research team elucidated the reactivity of triplet alkyl and vinyl nitrenes in solution and solid state using transient spectroscopy and matrix isolation. Among her many honors, Dr. Gudmundsdottir is a recipient of the NSF CAREER Award.

• Preface to the Series viiIntroduction ixContributors xi1 Ultrafast Time-Resolved Studies of the Photochemistry of Aryl Azides 1Jin Wang, Gotard Burdzinski, and Matthew S. Platz2 Theory and Computation in the Study of Nitrenes and their Excited-State Photoprecursors 33Shubham Vyas, Arthur H. Winter, and Christopher M. Hadad3 Nitrenium Ions and Related Species in Photoaffinity Labeling 77R. Marshall Wilson and Valentyna Voskresenska4 Aryl Nitrenium Ions in Aqueous Solution 117Michael Novak and Yue-Ting Wang5 Triplet Alkyl Nitrenes 167Sivaramakrishnan Muthukrishnan, Ranaweera A. A. U. Ranaweera, and Anna D. Gudmundsdottir6 Electronic Properties of Nitrenium Ions 191Daniel E. Falvey7 Time-Resolved Resonance Raman Spectroscopic Studies of Aryl Nitrenium Ions and their Chemical Reactions 217David Lee Phillips8 Matrix Studies on Aromatic and Heteroaromatic Nitrenes and their Rearrangements 273Curt Wentrup9 Nitreno Radicals 317Dirk Grote and Wolfram Sander10 Synthetic Applications of Nitrenium Ions 347Duncan J. Wardrop and Edward G. Bowen11 Fluorinated Aryl Nitrene Precursors 451Elisa Leyva, Denisse de Loera, Socorro Leyva, and Rogelio Jimenez-Cata~no12 Properties of Carbonyl Nitrenes and Related Acyl Nitrenes 481Nina P. GritsanIndex 549

DANIEL E. FALVEY, PhD, is Professor at the University of Maryland. His research focuses on reaction mechanisms and reactive intermediates, with an emphasis on the exploration of intermediates that play a role in biochemical processes. Dr. Falvey has been awarded the Merck Award and the Reynold C. Fuson Memorial Award in Chemistry. Acclaimed for his teaching abilities, he has received the Outstanding Teacher Award from the Center for Teaching Excellence.ANNA D. GUDMUNDSDOTTIR, PhD, is Professor of Chemistry at the University of Cincinnati. Dr. Gudmundsdottir's studies photo-removeable protecting groups, reactive intermediates, and polymer modification. Her research team elucidated the reactivity of triplet alkyl and vinyl nitrenes in solution and solid state using transient spectroscopy and matrix isolation. Among her many honors, Dr. Gudmundsdottir is a recipient of the NSF CAREER Award.

• Preface to the Series viiIntroduction ixContributors xi1 Ultrafast Time-Resolved Studies of the Photochemistry of Aryl Azides 1Jin Wang, Gotard Burdzinski, and Matthew S. Platz2 Theory and Computation in the Study of Nitrenes and their Excited-State Photoprecursors 33Shubham Vyas, Arthur H. Winter, and Christopher M. Hadad3 Nitrenium Ions and Related Species in Photoaffinity Labeling 77R. Marshall Wilson and Valentyna Voskresenska4 Aryl Nitrenium Ions in Aqueous Solution 117Michael Novak and Yue-Ting Wang5 Triplet Alkyl Nitrenes 167Sivaramakrishnan Muthukrishnan, Ranaweera A. A. U. Ranaweera, and Anna D. Gudmundsdottir6 Electronic Properties of Nitrenium Ions 191Daniel E. Falvey7 Time-Resolved Resonance Raman Spectroscopic Studies of Aryl Nitrenium Ions and their Chemical Reactions 217David Lee Phillips8 Matrix Studies on Aromatic and Heteroaromatic Nitrenes and their Rearrangements 273Curt Wentrup9 Nitreno Radicals 317Dirk Grote and Wolfram Sander10 Synthetic Applications of Nitrenium Ions 347Duncan J. Wardrop and Edward G. Bowen11 Fluorinated Aryl Nitrene Precursors 451Elisa Leyva, Denisse de Loera, Socorro Leyva, and Rogelio Jimenez-Cata~no12 Properties of Carbonyl Nitrenes and Related Acyl Nitrenes 481Nina P. GritsanIndex 549