Beilstein J. Org. Chem.2013,9, 1526–1532, doi:10.3762/bjoc.9.174
a Brønsted acid.
Keywords: allylation; hemiacetal; O,O-acetal; O,S-thioacetal; peroxyacetal; Re2O7; S,S-acetal; Introduction
The synthetically important conversions of hemiacetals to acetals, thioacetals, or homoallyl ethers are typically achieved through activation of the substrate with a strong