SEARCH Articles Figures Tables A-heteroatom-substituted A-heteroatom-substituted carbonyl Carbonyl compounds a-substituted Carbonyl compounds substitutions Carbonyl compounds substitutive Carbonyl substitution Carbonylation substitutive Heteroatom compounds Heteroatom substitution Heteroatom-substituted Heteroatomic compounds Substituted Compounds Substitution compounds Substitution heteroatom-substituted