SEARCH Articles Figures Tables 4- butyrate esters Additives esters Amino acid ester Amino acid ester enolates Amino acids reactions Amino-4- butyric acid Butyrate/butyric acid Butyric acid Butyric acid, 2-amino-4-phosphonosynthesis Enol esters Enol esters reaction Enolate Additions Enolates addition reactions Enolates enol esters Enolates intramolecular Enolic acids Enols acidity Enols addition reactions Ester enolate Ester enolates addition reactions Esters addition reactions Esters enolates Esters enolization Intramolecular addition Intramolecular reactions addition