Karen E. Bartelt* Bradford P. Mundy* Chemistry Department Chemistry Department, Illinois state university Montana State University Normal, Illinois 61761 Bozeman, Montana 59717 ... ABSTRACT: The use of hindered trialkylaluminum reagents is found to result in stereoselective reduction of the carbonyl group of 2-pr0pionyl-6-methyl-3~4-dihydro-2H- pyran . ... Two general protocols have provided the framework ... In retrosynthetic route @la1@ the ...