Photoisomerization of 2,3-diphenylcyclopropane-1-carboxylic acid derivatives.
Contrary to what is known about cis-1,2-diphenylcyclopropane and its derivatives, we find that they have triplet energies of ca. 311 kJ mol(-1), do not undergo intersystem crossing upon direct excitation, undergo the less common adiabatic photoisomerization to the corresponding trans isomers, and show emission from excited 1,3-diradical intermediates.
Sivaguru
J
J
Department of Chemistry, Tulane University, New Orleans, LA 70118, USA.
Jockusch
Steffen
S
Turro
Nicholas J
NJ
Ramamurthy
V
V