Hydrolysis of Spiro Derivatives that Undergo No Shrinkage on Polymerization

Abstract Acid-catalyzed hydrolyses of spiroorthoeters (1, 2a, 2b, and 2c) and spiroorthocarbonates (3 and 4) were carried out to give the corresponding ring-opening reaction products. The ring-cleavage modes of these spiro derivatives depended on the structure of intermediate cations.