SEARCH Articles Figures Tables Acetal and ketal Acetals O- Acetals and ketals Acetals ketals Acetals methylation Acetates methylated Acetic phenyl Methyl acetals Methyl acetate Methyl phenyl-acetate O phenylation O- phenyl O-Methyl-S-phenyl acetals and ketals protect carbonyl groups O-acetates Phenyl acetate S-Methylation S-methyl acetate