The reactions of deprotonated ethyl 2-arylacetates (aryl = p-nitrophenyl or p-cyanophenyl) with 2-cyanobenzaldehydes in DMSO at 20 °C were monitored by stopped-flow photometry. 
The zip file contains
txt files with absorbance vs. time data; exp files used for the k(obs) determination; pdf files with results of the k(obs) determination.
Folder names PTxxx refer to individual series of experiments and are identical to those in the Supporting Information (docx/rtf/pdf).