Conformational studies by dynamic NMR. stereomutation of the helical enantiomers of trigonal carbon diaryl-substituted compounds: dimesitylketone, dimesitylthioketone, and dimesitylethylene, 48

Results show that in the case of 1,1-dimesitylketone the two helical enantiomers interconvert through a one-ring flip pathway, while it occurs through a two-ring flip pathway in 1,1-dimesitylethylene as determined by dynamic nuclear magnetic resonance spectroscopy. The dimesitylthioketone exhibits an intermediary pathway.