Time-resolved pH jump study of photochemical cleavage and release of carboxylic acids from α-keto amides
作者:Chicheng Ma、Mark G. Steinmetz、Erica J. Kopatz、Rajendra Rathore
DOI:10.1016/j.tetlet.2004.11.167
日期:2005.2
jump experiments, using laser flash photolysis and bromocresol green as an indicator, showed that photochemical cleavage and release of carboxylic acids from various α-keto amides derivatives in aqueous media occurs on the microsecond timescale (18–136 μs), depending on carboxylateleavinggroup ability.
Photochemical Cleavage and Release of Carboxylic Acids from α-Keto Amides
作者:Chicheng Ma、Mark G. Steinmetz、Erica J. Kopatz、Rajendra Rathore
DOI:10.1021/jo050246s
日期:2005.5.1
H2CC(OH)CON+(R)C(R‘)CH35a−c, cyclize intramolecularly to 3b or undergo intermolecular addition of water followed by tautomerization and cyclization to give 2a,c. These inter- or intramolecular trapping reactions of 5 release protons that decrease the pH and cause bleaching of the 620 nm band of the pH indicator, bromocresol green. Determination of the bleaching kinetics by laserflashphotolysis methods in the case