title: Direct observation of 1,2-hydrogen migration in the excited states of alkyl diazo esters by ultrafast time resolved IR spectroscopy.
abstract: The mechanism of 1,2-H migration process in photoexcited alkyl diazo esters was studied by femtosecond IR transient absorption spectroscopy and theoretical calculations. Two possible processes are discussed: rearrangement in the diazo excited state (RIES) and the intermediacy of singlet carbene species. In chloroform solvent ulrafast IR data show a subpicosecond rise of alkene species indicating the occurrence of the RIES process. Failure in carbene species detection is explained by their absence or very low quantum yield of formation.
authors.affiliation: Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University, 85 Umultowska, Poznan 61-614, Poland. Gotardb@amu.edu.pl
authors.forename: Gotard
authors.initials: G
authors.lastname: Burdzinski
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Peter
authors.initials: P
authors.lastname: Selvaraj
authors.forename: Michel
authors.initials: M
authors.lastname: Sliwa
authors.forename: Matthew S
authors.initials: MS
authors.lastname: Platz