Ring-enlargement of Cyclopropylacylsilanes with Sulfuric or Triflic Acid. Selective Formation of Cyclobutanones or 2-Silyl-4,5-dihydrofurans

Article abstract of DOI:10.1016/0040-4039(95)00125-V

Reaction of cyclopropylacylsilanes with sulfuric or triflic acid in aprotic solvent affords the corresponding cyclobutanone or 2-silyl-4,5-dihydrofuran derivatives, depending upon the substituents on the three-membered ring or acid used.The use of triflic