Lactones are cyclic carboxylic esters. They are derived from the corresponding hydroxycarboxylic acids by esterification. They can be saturated or unsaturated...

produced from itaconic anhydride and furfuryl alcohol by Diels-Alder lactonisation using a Grubbs II catalyst. Sigma-Aldrich Co., product no. {{{id}}}...

removed the isopropyl group, deacetylated an intermediate and induced lactonisation to deliver methyl O-methyl-hypopsoromate, a fully formed depsidone skeleton...

hydroxy acid which was then converted to methyl O-methylgrayanate through lactonisation with trifluoroacetic anhydride. The final stages of the synthesis involved...