SEARCH Articles Figures Tables Cyclization agents/cyclizations acetic anhydride Cyclization agents/cyclizations carbodiimides Cyclization agents/cyclizations chloride Cyclization agents/cyclizations dicyclohexylcarbodiimide Cyclization agents/cyclizations methyl chloroformate Cyclization agents/cyclizations microwaves Cyclization agents/cyclizations mixed anhydrides Cyclization agents/cyclizations phosphorus oxychloride Cyclization agents/cyclizations thionyl chloride Cyclization agents/cyclizations triethyl orthoformate Cyclization agents/cyclizations trifluoroacetic anhydride Cyclization agents/cyclizations zinc acetate Cyclization agents/cyclizations zinc chloride Cyclization trimethylsilylating agent Sulfuric acid as cyclizing agent