Thursday, 26 October 2006
OLCC-McClain (Oakley-Lindsay Center)
160

Autoinduction in the asymmetric Pudovik reaction

Donnie A. Smith III and Chris D. Spilling. University of Missouri- St. Louis, St. Louis, MO

Asymmetric autoinduction has been observed in the reaction of acrolein with dimethyl phosphite using titanium(IV) isopropoxide/dimethyl tartrate (DMT) complex as catalyst. The conversion and product enantiomeric excess for the reaction were determined on a series of aliquots using 31P NMR spectroscopy. A plot of the enantiomeric excess (e.e.) vs. conversion gives a logarithmic curve reaching a terminal e.e. of 70%. This suggests that the product of the reaction incorporates itself into the catalyst and generates a more stereoselective catalyst in solution. Exploiting this effect could lead to products which have enantiomeric excesses of >99%.


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