Inversion of regioselectivity in reactions of diols through the use of hexamethylenestannylene acetals as intermediates
作者:T.Bruce Grindley、Xianqi Kong
DOI:10.1016/s0040-4039(00)73960-8
日期:1993.8
Hexamethylenestannylene acetals obtained from a variety of carbohydrate-derived terminal 1,2-diols give good to excellent regioselectivity for tosylation at the secondary oxygen. In contrast, non-cyclic dialkylstannylene acetals react mainly at the primary oxygen. These results are attributed to the greater stability of the dominant stannylene acetal dimers for hexamethylenestannylene acetals.