Substituent effects on13C and15N chemical shifts in triazenes studied by principal components multivariate data analysis
摘要:
AbstractPrincipal components analysis was applied to the 13C and 15N chemical shift data on a series of fifteen 1‐(para‐substituted‐phenyl)‐3‐acetyl‐3‐methyltriazenes. It was found that the halogen‐substituted triazenes formed a class, based on substituent effects, which was different from the remaining eleven triazenes. A one‐component model described the halogen class, whereas a two‐component model was necessary for a description of the second class. In the second class, substituents tended to cluster to form groups depending on their electronic character.