Propiophenone derivative structure

Tidwell and coworkers have estimated from structure-reactivity relationships that the ft -dimethylenamines are slower by a factor of 30 than if the -methyl groups were absent. Similarly, the single S-methyl group on the propiophenone derivatives is expected to reduce h+ by a factor of 3.4 . ... 

Fig. (53). Structure of a propiophenone derivative isolated from Baccharis magellam ica...

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