Metal-promoted cyclization. 3. Highly selective synthesis of .alpha.-alkylidenetetrahydrofurans and .gamma.-alkylidenebutyrolactones via intramolecular opening of epoxysilanes
Metal-promoted cyclization. 3. Highly selective synthesis of .alpha.-alkylidenetetrahydrofurans and .gamma.-alkylidenebutyrolactones via intramolecular opening of epoxysilanes