Simultaneous Control of Regio- and Stereochemistries in the Reaction between [alpha]-Alkoxyaldehydes and Pentadienyltin. Selective Preparations of the Four Regio- and Diastereoisomers

In the reaction between α-alkoxyaldehydes and pentadienyltin. each of the possible four regio- and stereoisomers, syn-γ-, anti-γ-, syn-[straight epsilon]-, and anti-[straight epsilon]-adducts, was selectively synthesized by the use of an appropriate combination of alkoxyl groups, Lewis acids, and solvents applied.