SEARCH Articles Figures Tables Acetals and ketals, heterocyclic, to protect imidazolines Acetals and ketals, heterocyclic, to protect oxathiolanes Acetals and ketals, heterocyclic, to protect oxazolidines Acetals and ketals, heterocyclic, to protect thiazolidines Protection for Imidazoles, Pyrroles, Indoles, and other Aromatic Heterocycles